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                            COLOUR TELEVISION

                            Service Manual

                                                       MODEL :



             48cm super flat picture tube

             Auto search 181 program presetting and memory

             CCD & V-CHIP

                       Haier         Group

NO:M-MR-AE-HTN19R12-76814                        Edition:2004/4/17


1.    Contents...............................................................................1

2.    Product code illumination and series introduction.....................2

3 Features.............................................................................3
4 Safety Precaution................................................................4
5 Warning and cautions...........................................................5
6 Net Dimension....................................................................11
7 Parts and Functions............................................................12
8 Remote controller Functions................................................13
9 Program Diagram................................................................14
10.   Maintenance Service and Trouble Shooting........................15
11.   Circuit     Diagram..................................................................21
12.   Circuit Explanation..............................................................24
13.   Adjustment.........................................................................31
14.   Exploded View....................................................................33
15.   List of Parts........................................................................34
16.   Damageable Parts List.........................................................49
17.   Information of Resistors and Capacitors...............................50
                           Product code illumination and series introduction

2. Product code illumination and series introduction

         HTN   19   R12

                                          Color television appearance
                                         Appearance serial
                                          CRT catercorner 20inch (51cm)

      3. FEATURES

                                    FUNCTION                                                      FUNCTION

1               Main IC                               76814            39                NO. of built-in speakers            1

2               CRT                                 flat picture       40                Audio output power(W)              2W

3               Color system                        NTSC3.58           41                Total power inputW                 70W

4               Audio system                            M              42                Voltage rangeV                     120V

5               NO.of channels                          181            43                Power frequencyHz                 60HZ

6               OSD language                   ENGLISHFRENCH SPANISH   44                Time of sleep timer(MINS)         120MIN

7               Multi-picture modes                                    45                Net weight(KG)                      21

8               AV stereo                                              46                Gross weight(KG)                    23

9               Super woofer                                           47                Net dimension(MM)

10              Surrounding sound                                      48                Packaged dimension(MM)

11              Treble/bass boost                                      49                Quantity for 20' container

12              Left/right balancer                                    50                Quantity for 40' container

13              NICAM                                                  51                Quantiry for 40' high container

14              Multi-audio modes                                      52   APPROVAL     Acquired certificate

15              Tone adjuster                                          53                Suitable market

16              MTS/SAP

17              Auto-volume leveling

18              AV input                                 Y

19              AV output

20              DVD terminal

21              S-video jack

22              Headphone socket                          Y

23              SCART socket

24              Digital curtain

25              Slow fading on & off

26              Semitransparent menu

27              Non-flshing channel changing

28              ZOOM

29              16:9 mode

30              Games

31              Calendar

32              Child-lock

33              Multi-functional lock                    Y

34              No-picture listening

35              Background light

36              Auto-timer on

37              CCD                                      Y

38              V-CHIP                                   Y
                                                                      SAFETY PRECAUTIONS

These parts are identified by many electrical and mechanical parts in this chassis have
special safety-related characteristics.
It is essential that these special safety parts should be replaced with the same components
as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of the manufacturer.
General Guidance
An Isolation Transformer should always be used during the servicing of a receiver whose
chassis is not isolated from the AC power line. Use a transformer of adequate power rating
as this protects the technician from accidents that might result in personal injury caused by
electrical shocks.
It will also protect the receiver and it's components from being damaged by accidental
shorts of the circuitry that might be inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with a specified one.
When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the
resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to the high vacuum and large surface area of the picture tube, extreme care should be
taken in handling the Picture Tube. Do not lift the Picture Tube by its Neck.
X-RAY Radiation
The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the
Picture Tube.
For continued X-RAY RADIATION protection, the replacement tube must be of the same
type as specified in the Replacement Parts List.
Before returning the receiver to the customer,
Always perform an AC leakage current check on the exposed metallic parts of the cabinet,
such as antennas, terminals, etc., to make sure that the set is safe to operate without any
danger of electrical shock.
                                                                             Warning and Cautions

5Warning and Cautions

 1. When you clean the TV set, please pull      4. To prevent the TV set from firing and
 out the power plug from AC outlet. Don't       electric shock, don't
 clean the cabinet and the screen with          make the TV set rain
 benzene, petrol and other chemicals.           or moisture.

 2. In order to prolong the using life of the   5. Don't open the back cover, otherwise it is
 TV set, please place it on a ventilated        possible to damage the components in the
 place.                                         TV set and harm you.

 3. Don't place the                             6. When the TV set isn't going to be used
 T V set i n t h e                              for long time or it is in thunder and
 sunshine or near                               lightening, please pull out the plug from AC
 heat source.                                   outlet and the antenna plug from the cover
                                                of the TV set.

                                                                                   Figure 1
                                                                          Warning and Cautions

Explanation on the display tube
Generally, it is not needed to clean the tube surface. However, if necessary, its surface can
be cleaned with a dry cotton cloth after cutting off the power. Don't use any cleanser. If
using hard cloth, the tube surface will be damaged.
CAUTION: Before servicing receivers covered by this service manual and its
supplements and addenda, read and follow the SAFETY PRECAUTIONS.
NOTE: If unforeseen circumstances create conflict between the following servicing
precautions and any of the safety precautions, always follow the safety precautions.
Remember : Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power source before:
    a. Removing or reinstalling any component, circuit board module or any other
       assembly of the receiver.
    b. Disconnecting or reconnecting any receiver electrical plug or other electrical
    c. Connecting a test substitute in parallel with an electrolytic capacitor in the receiver.
         CAUTION: A wrong substitution part or incorrect installation polarity of electrolytic
         capacitors may result in an explosion hazard.
    d.    Discharging the picture tube anode.
2. Test high voltage only by measuring it with an appropriate high voltage meter or other
   voltage-measuring device (DVM, FETVOM, etc.) equipped with a suitable high voltage
   probe. Do not test high voltage by "drawing an arc".
3. Discharge the picture tube anode only by (a) first connecting one end of an insulated
   clip lead to the degaussing or kine aquadag grounding system shield at the point where
   the picture tube socket ground lead is connected, and then (b) touch the other end of
   the insulated clip lead to the picture tube anode button, using an insulating handle to
   avoid personal contact with high voltage.
4. Do not spray chemicals on or near this receiver or any of its assemblies.
5. Unless specified otherwise in this service manual, clean electrical contacts only by
   applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or
   comparable nonabrasive applicator; 10% (by volume) Acetone and 90% (by volume)
   isopropyl alcohol (90%-99% strength)
   CAUTION: This is a flammable mixture.
   Unless specified otherwise in this service manual, lubrication of contacts is not required.
6. Do not defeat any plug / socket B+ voltage interlocks with which receivers covered by
   this service manual might be equipped.
7. Do not apply AC power to this instrument and/or any of its electrical assemblies unless
                                                                      Warning and Cautions

     all solid-state device heat sinks are correctly installed.
8. Always connect the test receiver ground lead to the receiver chassis ground before
  connecting the test receiver positive lead.
     Always remove the test receiver ground lead last.
9. Use with this receiver only the test fixtures specified in this service manual.
     CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity.
Such components are usually called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field effect transistors and
semiconductor "chip" components. The following techniques should be used to help
reduce the incidence of component damage caused by static electricity.
1.    Immediately before handling any semiconductor component or semiconductor-
     equipped assembly, drain off any electrostatic charge on your body by touching a
     known earth ground. Alternatively, obtain and wear a commercially available
     discharging wrist strap device, which should be removed to prevent potential shock
     prior to applying power to the unit under test.
2.    After removing an electrical assembly equipped with ES devices, place the assembly
     on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup
     or exposure of the assembly.
3.    Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4.     Use only an anti-static type folder removal device. Some solder removal devices not
     classified as "anti-static" can generate electrical charges sufficient to damage ES
5.    Do not use freon-propelled chemicals. These can generate electrical charges
     sufficient to damage ES devices.
6.     Do not remove a replacement ES device from its protective package until immediately
     before you are ready to install it. (Most replacement ES devices are packaged with
     leads electrically shorted together by conductive foam, aluminum foil or comparable
     conductive material).
7.     Immediately before removing the protective material from the leads of a replacement
     ES device, touch the protective material to the chassis or circuit assembly into which
     the device will be installed.
     CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other
     safety precautions.
8.     Minimize bodily motions when handling unpackaged replacement ES devices.
     (Otherwise even some normally harmless motions such as mutual brushing of your
     clothes' fabric or lifting of your foot from a carpeted floor might generate static electricity
     sufficient to damage an ES device.)
                                                                       Warning and Cautions

General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that
   will maintain tip temperature within the range of 500 oF to 600 oF.
2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire bristle (0.5 inch, or
   1.25cm) brush with a metal handle. Do not use freon-propelled spay-on cleaners.
5. Use the following unsoldering technique
   a. Allow the soldering iron tip to reach normal temperature.(500 o F to 600o F)
   b. Heating the component lead until the solder melts.
   c. Quickly draw the melted solder with an anti-static, suction-type solder removal
      device with solder braid.
        CAUTION: Work quickly to avoid overheating the circuit board printed foil.
6. Use the following unsoldering technique
   a.    Allow the soldering iron tip to reach normal temperature.(500 o F to 600o F )
   b.    First, hold the soldering iron tip and solder the strand against the component lead
        until the solder melts.
   c.     Quickly move the soldering iron tip to the junction of the component lead and the
        printed circuit foil, and hold it there only until the solder flows onto and around both
        the component lead and the foil.
        CAUTION: Work quickly to avoid overheating the circuit board printed foil.
   d.    Closely inspect the solder area and remove any excess or splashed solder with a
        small wire-bristle brush.
Remove /Replacement
Some chassis circuit boards have slotted holes (oblong) through which the IC leads are
inserted and then bent flat against the circuit foil. When holes are of slotted type, the
following technique should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique as outlined .
Desolder and straighten each IC lead in one operation by gently prying up on the lead with
the soldering iron tip as the solder melts.
Draw away the melted solder with an anti-static suction-type solder removal device (or with
solder braid) before removing the IC.
Carefully insert the replacement IC in the circuit board.
                                                                   Warning and Cautions

Carefully bend each IC lead against the circuit foil pad and solder it.
Clean the soldered areas with a small wire-bristle brush.(It is not necessary to reapply
acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Remove the defective transistor by clipping its leads as close as possible to the component
Bend into a "U" shape the end of each of three leads remaining on the circuit board.
Bend into a "U" shape the replacement transistor leads.
Connect the replacement transistor leads to the corresponding leads extending from the
circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then
solder each connection.
Power Output, Transistor Device
Heat and remove all solder from around the transistor leads.
Remove the heat sink mounting screw (if so equipped).
Carefully remove the transistor from the heat sink of the circuit board.
Insert new transistor in the circuit board.
Solder each transistor lead, and clip off excess lead.
Replace heat sink.
Diode Removal/Replacement
Remove defective diode by clipping its leads as close as possible to diode body.
Bend the two remaining leads perpendicularly to the circuit board.
Observing diode polarity, wrap each lead of the new diode round the corresponding lead
on the circuit board.
Securely crimp each connection and solder it.
Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they
are not shiny, reheat them and if necessary, apply additional solder.
Fuse and Conventional Resistor
                                                                             Warning and Cautions

1. Clip each fuse or resistor lead at top of the circuit board hollow stake.
2. Securely crimp the leads of replacement component around notch at stake top.
3. Solder the connections
   CAUTION: Maintain original spacing between the replaced component and adjacent
   components and the circuit board to prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit board will weaken the
adhesive that bonds foil to the circuit board causing the foil to separate from or "lift-off" the
board. The following guidelines and procedures should be followed whenever this
condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the following procedure to install
a jumper wire on the copper pattern side of the circuit board.(Use this technique only on IC
1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much
    copper as absolutely necessary).
2. Carefully scratch away the solder resist and acrylic coating (if used) from the end of the
    remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around
    the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper pattern and let it overlap
    the previously scraped end of the good copper pattern. Solder the overlapped area
    and clip off any excess jumper wire.
At other connections
Use the following technique to repair the defective copper pattern at connections other
than IC Pins. This technique involves the installation of a jumper wire on the component
side of the circuit board.
1. Remove the defective copper pattern with a sharp knife.
   Remove at least 1/4 inch of copper, to insure that a hazardous condition will not exist if
   the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern break and locate the
   nearest component that is directly connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one
    side of the pattern break to the lead of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so that it does not touch
components or sharp edges.
                       Net Dimension

6Net Dimension

                 Figure 2
                                                                Parts and Funcitions

7Parts and Funcitions

Front and side panel of the TV set

                         TV/AV MENU VO LUME   CHANNEL

                                                                 Figure 3
When using S terminal, please pull out video 1 input terminal
                                            Remote Controller Functions

8. Remote Controller Functions

       M EN U     CH+

 2                                     1
 4    VOL-                      VOL+


      1           2         3
      4           5         6          5
      7           8         9
     RECALL                 DISPLAY
6                                      7
          P.STD             SLEEP
11                                     12

                                                        Figure 4
                                                                               Program Diagram

9. Program Diagram
I. Features

HTN19R12 color TV sets (designed for the US market) incorporate the monolithic integrated circuit
LA76814K developed by SANYO in 1999 and the CPU LC863432B-535A designed for LA76814K

LA76814K intergrates the sound accompany filter and trap filter in the chip, resulting in minimized
application of peripheric components, maximized integtration and reliable performance. The chip
functions for picture intermediate frequency amplification, picture detection, sound intermediate
frequency amplification, sound frequency discrimination, video amplification, choma decoding, line
and field synchronized scanning wave formation and output. The circuits of picture detection, sound
frequency discrimination and chroma decoding incorporate PLL demodulation which is noted for
significant stability and reliability. In addition, this chip integrates the brightness and chroma retarding
lines and additional functions of black level extension, bus geometric figure adjustment, I2C bu control
on the basis of the 7687, resulting in test point free assembly, reduced components of test point and
peripheric components and improved picture quality.

The CPU LC863424 uses SANYO LC863432B-535A series for reprogramming. In the design,
functions of CCD and V-CHIP as well as various function extensions are added for the North American
market. This chip also uses low frequency 32.7KHZ crystal oscillator to reduce interferences to
pictures and medium frequency signals.

II. Technical properties and requirements
1. Main performance index
    1. Screen diagonal:                      51cm
    2. Receiving system:                     NTSC-M
    3. Receiving channel:                    VHF-channel 2~13
                                             UHF-channel 14~49
                                             CATV-channel 1~125
    4. Antenna input:                             75F plug
    5. Picture limit noise sensibility:       VHF51dBV
    6. Color sensitivity:                     40dBV
    7. Two signal selectivity:               -1.5MHZ45dB
                                                                                      Program Diagram

     8. Sound noise limit sensitivity:          VHF39dBV
     9. Sound output power:                       2W
     10. X-ray radiation value:                   <0.1mR/Hr
     11. Voltage:                                AC 100130V
     12. Energy consumption:                     70W
     13. Net dimensions:                         472mmX445mmX432mm
     14. Net weight:                            17.5Kg
2. User's instructions

Note: This TV set has been installed a caption decoder and control to US Federal Communications Commission.

Customized Power On setup

This TV set is designed for customized initiation. (For detailed information, see the User's Manual.) The TV set
has been preset before delivery and can be reset by the user.

Power on

1      When the TV set is connected with the power supply, the power indicator illuminates. When the Power
    On/Off button on the TV set or the remote controller is pressed, the TV set is started.

2      When the MENU button on the remote controller is pressed, the menu will appear on the screen. The CH
    and VOL buttons are used for setup.

3      Press of CH+ or CH- button will result in moving the icon up or down for function options. The
    designated item will turn green.

4      Pressing the VOL+ or VOL- button can change the designated item.

VIDEO setup

1      Press MENU button for VIDEO option.
2      Press CH+ or CH- button to designate desired item. (Move the icon to designated item and the submenu
    will appear.)
3      The menu item under the icon will turn bright green. Press VOL+ or VOL- button for options.
                     Options                              VOL+                                VOL-
                                                                                     Program Diagram

                  CONTRAST                          Contrast increase                   Contrast decrease
                    BRIGHT                         Brightness increase                 Brightness decrease
                    COLOR                            Color increase                      Color decrease
                    SHARP                          Sharpness increase                  Sharpness decrease
                         TINT                         Tint increase                       Tint decrease
4     Press MENU button again to quit the main MENU.


1     Press SETUP button, the main menu will appear on the screen.
2     Press CH+ or CH- for LANGUAGE options. The designated LANGUAGE will turn bright green.
3     Press VOL+ or VOL- for LANGUAGE options (such as English, Spanish and French)
4     Receiving: Press VOL- button to move the icon to RECEPTION. The TV set is preset AIR state before
    delivery (indicating that unlimited receiving of 0~63 channel signals). If the TV set is connected with the
    cable TV system, press VOL+ button for CABLE option.
5     Automatic search: Press CH+ or CH- button for AUTO PROGRAM. When VOL or +VOL- is pressed, the
    function of automatic channel search will be activated (if signals are available, the channel will be fixed. If
    VOL+ button is pressed again, the search can be resumed.)
6     Add/delete: Press CH+ or CH- button for option of ADD/DELETE. Press VOL+ or VOL- button to add or
    delete some channel.
7     Input: Press CH+ or CH- button for option of INPUT. Press VOL+ or VOL- button, or press AV/TV
    button on the remote controller for option of AV/TV.
8     Press MENU button again to quit the main menu.

TIME setup

1     Press MENU button and the main menu appear on the screen.
2     Press CH+ or CH- button to move the icon for TIME setup. The designated CLOCK under the icon will
    turn bright green.
3     Press VOL+ or VOL- button for options of hour, minute and am/pm on the CLOCK.
4     Press CH+ or CH- to adjust the figure until designed time value is reached. Set ON TIME/OFF TIME
    with the same way.
5     Press CH+ or CH- for option of SLEEP. Press VOL+ or VOL- for option of set clock. The clock display
    will turn bright green while SLEEP icon turns blue. Press CH+ or CH- for sleep period adjustment.
    015 / 030 / 045 / 100 / 115 / 130 / 145 / 200
6      When CHANNEL in TIME setup is designated, this option will be the preset channel when the TV set is
                                                                                 Program Diagram
    turned on or off.
7     Press MENU button again to quit the main menu.
1      Press MENU button Press MENU button Press MENU button and the main menu appear on the screen.
2      Press CH+ or CH- button to move the icon to SPECIAL, and designate C.CAPTION. Then icon of
    C.CAPTION turns to bright green. When OFF is displayed, C.CAPTION is inactivated while when ON is
    displayed, C.CAPTION is activated.
3      Press CH- to move the icon to CC ON MUTE and the icon will turn bright green. Press VOL+ or VOL-
    button for adjustment of this function. When OFF is displayed, the item cannot display its function
    regardless of the indication of C.CAPTION. When this item displays C1 while C.CAPTION displays OFF,
    the system will activate C.CAPTION function automatically.
4      Press CH- button to move the icon to POWER RESTORE. Press VOL+ or VOL- to adjust power on and
5      When icon designates MENU OFFSET, the digital value of the designated item can be adjusted by
    pressing VOL+ or VOL-. Function of this item is to change the location of the menu.
6      Press MENU button again to quit the main menu.

V--CHIP setup

This function is designed for television program limitation. The TV set user is allowed to control the usage of the
TV set in accordance with the regulations of US Federal Communications Commission. This function is also
destined to prevent children from watching the TV programs which are improper for juvenile.

1      Press MENU button, the menu will appear on the screen. Press RATING button, V-CHIP displays the
2      Press CH+ or CH- button to move the icon to another option, then the designated item will turn bright red.
3      When an item is selected, press MENU button and the submenu of the designated item will appear on the
4      Press MENU button and return to V-CHIP.
5      Press RATING button to the main menu.
6      Press RATING button again to quit the main menu.

1      Press RATING button, and the RATING main menu will appear on the screen.
2      Designate OPTION MENU and then press MENU button, OPTION MENU will appear on the screen.
3      Press CH+ or CH- button for item option, and the color of designated item will change from yellow to
    bright green.
4      When HELP is selected, press MENU button and HELP menu will appear on the screen. Press CH+ or
                                                                                       Program Diagram

    CH- to search up and down for relative items. If MENU button is pressed again, OPTION MENU will
5     When NO-INFO RATING is selected, press MENU button for option of UNBLOCK or BLOCK state.
6     When NO RATED is selected, press MENU button for option of UNBLOCK or BLOCK state.
7     When ENTER PASSWARD is selected, press MENU button, then a dialog box will appear at bottom left
    corner of the screen and then a 4 digit password can be input. Press RATING button again to return to the
    main menu.The password must be input when entering the V-CHIP submenu.

1     Press RATING button.
2     When TV RATING is selected, press MENU button and the submenu will appear on the screen as follows:
       RATING                 FV                  V                   S                  L                  D
     In the table, the blocks marked "" indicates the restrictive items. If all restrictive items are to be selected,
     move the icon to the top left corner of the table and then press MENU button.
       1 If all restrictive items are to be released, move the icon to the bottom left corner and press
                 MENU button twice.
       2 If one of the restrictive items is to be selected, press CH+ or CH- button in an alternate way and
                 press MENU button (for some line) and then VOL+ or VOL- for option of desired line. Finally
                 press MENU button.
       3 Some item can be deleted by following the same process above.

 4 Press RATING button again to quit V-CHIP menu.

 1 Press RATING button, and the RATING main menu will appear on the screen.
 2 When MPAA RATING turns bright red, press MENU button and MPAA RATING submenu will appear
      on the screen.
 3 If all items are to be selected, press CH+ or CH- button to move the icon to the top left corner, and then
      press MENU button.
 4 If all selective items are to be deleted, press CH+ or CH- button to move the icon to the bottom left corner,
      and then press MENU button twice.
                                                                                       Program Diagram

     5. Items under or above the designated icon in the submenu can be selected.
     6. Press RATING button again to quit V-CHIP menu.

     1 Press RATING button, and the RATING main menu will appear on the screen.
     2 When BLOCK turns bright red and MENU button is pressed, BLOCK will display BLOCK OFF and
         BLOCK ON.

BLOCK OFF: Indicating lock on status. Regardless setup of TV RATING and MPAA RATING, even V-CHIP
                 signals are received during TV programs, this TV set dos not have the V-CHIP function.
BLOCK ON: Indicating lock off status. When TV RATING and MPAA RATING are selected, the TV set will
                 have the V-CHIP function when V-CHIP signals are received in the TV program.

1. Keep the TV set away from heat resources, such as stoves and radiators;
2. Place the TV set in a well ventilated area;
3. Place the TV set in an area free from dusts and corrosive gas;
4. Prevent the TV set from waterdrops, moisture and humidity;
5. Do not place magnetic materials on the TV set;
6. Disconnect the TV set when moving the TV set.
7. When the TV set is turn on during a rainy weather, disconnect the outdoor antenna and use the indoor
      antenna attached to the TV set.
8.    Disconnect the TV set from power supply source during a power interruption or vacation.
                                                                                           Maintenance Service and
                                                                                           Trouble Shooting

10. Maintenance Service and Trouble Shooting

                                              No light and sound

                                               Check to see if
                                               Fuse3 is normal

                     Check VD504, C507,                               Check to see 103V
                         V513, etc.                                  etc. voltage is normal
                       Check to see if the                         T to see all terminal
                       collector voltage of                          Resistance of load
                         VD554 is 18V                                    Is normal

        Normal                                 Abnormal Normal                                Abnormal

             Check to see            Check the control      Check switch           Check to see if
                if , 9v,             voltage of V552 or       power unit           rectifying tube
             5v is normal                CPU power                                   is normal

    Normal                                      Abnormal           Normal                                Abnormal

        Check                          The failure of                    Change                  Check the
      N701,N101                       horizontal unit or              rectifying tube             Loader
                                                                          Maintenance Service and
                                                                          Trouble Shooting

2                                           No raster

                                   Whether G2 voltage is normal
                   Normal                                             Abnormal

           Check heating voltage                             Check base voltage H-drive

       Normal            Abnormal                            Normal         Abnormal

 Check the voltage       Heater Resistor           Check to see if b.e         Check the circuit
                             open                  voltage of V433 is       from pin13 of N201 to
of all pins of XP902
       is normal                                        existed?                   H-drive
                          Abnormal                                  Abnormal
 Normal                                             Normal

    Video amplifying      Inspect the circuit      Check the voltage        InspectT431R434
board is abnormal        from pin19 20             of V433 collector is             etc.
                            21 of N201 to                normal
                           video amplifying         Higher        Lower

                                         V433 is not well           T431V433 Or
                                         welded or open            C415C416 Care

                               Normal                   Abnormal

                         Check N201                 Replace bad cmponents

                Normal               Abnormal

       Check N201 and                    Check +12V power circuit
                                                                          Maintenance Service and
                                                                          Trouble Shooting

                                         Horizontal bright line

                         Make R451 open. Multimeter is at range R1K. Red
                         probe connects to ground. Touch No.5 of N401 with
                            black probe. Bright line flashes for a moment

              Yes                                                                    No

         There is trouble in V-circuit                        There is trouble in V-output circuit

                                                              Check the voltage at Pin2 of N401

Normal                           Abnorma               Yes                                        No
Replae components        Check N201 and        Check if the vertical deflection        Inspect +24V
                             N701                  Deflection yoke plug                power circuit
                                                                 Maintenance Service and
                                                                 Trouble Shooting

4                                 Lack of red

                            Check to see if V902 is
                            open or not well welded

          Change V902 or                      Check to see if voltages of XP902
          weld V902 again                                are normal

                                        Yes                                       No

                                      Replace CRT                   Check ircuit between
                                                                     Pin19 of N201 and

                        Picture exists but no sound

          Cut of C601connect red pen of multi-meter(R*1K)with
         ground,and black pen tap Pin1 of N602 if there is snapping

        Yes                                                    No

     Power amplifier is normal.       Cut off collection electrode of V602,use
    Check N101 and external SIF         black pen of multimeter tap Pin1 of
              circuit                    N601 if there is snapping sound

                            Yes                                        No
                      Check muting circuit                    Check to see if
                        and V601\V602                          +19V exists

         Normal                                                        Abnormal

     Check SIF circuit and speaker                             Inspect +19V
                                                               power supply
                                                                    Circuit Diagram

11.    Circuit Diagram

  1. Pane hint picture

                                                           Sound Power
                           Picture/Sound IF Amplifier,
                            Video and audio signal
               SAW         RGB Output Circuits                                CRT
                           and H &V Sync pulse
                                segregation                Horizontal Scan

                                                           Vertical Scan

 Main Processor
                                      Audio/Video In/Out

Infrared Receiver        Remote Controller

                                                               Figure 5
                             Circuit Diagram




                                               Figure 6
                 PCB Diagram

3. PCB Diagram

                      Figure 8
                                                                       Circuit Explanation

      12. Circuit Explanation
1. Principle integrated circuits

      A1. HTN19R12 color TV set composed of the following sections

            (1) Small signal processing: super monolithic integrated circuits N204(LA76814A).
                and memory N901 (AT24C08).
            (2) Sound power amplifying: integrated circuits N701 ( LA4525).
            (3) Horizontal and Vertical scan output circuits: Vertical output integrated circuits
                N402 (LA78040), Horizontal output transistor V411 (TT2140), Horizontal flying
                back transformer T402 (JF0501-19810).
            (4) Switch power supply: switch transformer T501 (BCK-01-90II), power transistor
                V503 (2SD4460).

      A2.     Main integrated circuits:

            (1) LA76814A             Microprocessor
                                     Picture IF/sound IF/video processing/H and V
                                     Scan/color decoding
            (2) LA78040              Vertical output integrated circuits
            (3) LA4525               Sound power amplifying integrated circuits

      A3.     Electrical circuit analysis

    1Microprocessor and Small signal processing: super monolithic integrated circuits 
        LA76814A is super large integrated circuit decoder, containing intermediate image
        amplifying, intermediate sound amplifying, horizontal and vertical scan, small
        signal processing, color decoding, hi-pressure tracing and over-load protection,
        I2C bus control.
 Information introducing functions and testing data for maintenance is listed in Table 1.
1. N701 LC863424B

 PIN            Leads Function       Voltage (V)   PIN         Leads Function        Voltage (V)

  1         Auto adjust Enable Pin      5.1        19      OSD red signal output       0.09

  2                 Blank                          20     OSD greem signal output      0.09

  3                IIC data             4.6        21      OSD blue signal output      0.09

  4                IIC clock            4.5        22     OSD blank signal output      0.01
                                                                       Circuit Explanation

     5            Earth                     0      23              Blank                5.1

     6                                   2.2       24         MUTE control             0.02
         Crystal oscillation port
     7                                  2.75       25              Blank               5.07
         Crystal oscillation port

     8        Power (+5V)                5.1       26       AV option control 2        0.01

     9     Plate control input          0.25       27       Av option control 1        0.01

 10         AFT signal input             0.3       28       Control signal input        5.1

                                                        Right channel sound volume
 11              Blank                             29                                  0.01
                                                          PWM output port
                                                        Left channel sound volume
 12       S terminal input test          5.1       30                                  0.01
                                                        PWM output port

 13          CPU reset port              5.1       31              Blank

 14            OSD filter               3.55       32          Demagnetize             0.007

 15        Video signal input            3.2       33              Blank

           POWER ON/OFF
 16                                     0.03       34              Blank
          control signal output

 17         Field pulse input            4.8       35              Blank

 18         Line pulse input             4.3       36              Blank

2. N101 LA76814K
                                     Working                                            Working
PIN         Leads Function                        PIN          Leads Function
                                    Voltage (V)                                        Voltage (V)
 1          Video output               2.23       28       Reciprocal pulse input            1.06
 2        FM filter output             2.23       29         Reference current               1.69
 3           AGC filter                2.22       30           Clock output                  0.002
 4         Hi AGC output               2.59       31               N.C.                      0.002
 5            MF input                 1.30       32         OSD gain control                3.05
 6            MF input                 2.83       33               GND                         0
 7              GND                    2.83       34          X ray protection               0.06
 8              Power                   0         35      ACC KILLER FILTER                  0.39
                                                                                      Circuit Explanation

 9              FM filter               4.94          36              CHROMA AFC-F                           3.49
10             AFT output               1.90          37             CW3.58MHz OUT              0.54
                                                                            Circuit Explanation
11              Data bus                2.77          38                                        2.87
12              Clock bus               4.85          39                 Auto color filter                   3.2
13             Beam input               4.76          40               Video output option                   2.43
14               R input                3.92          41                      GND                             0
15               G input                0.14          42               Outside video input                   2.55
16               B input                0.15          43                      Power                           5
17             Beam limit               0.08          44                Inside video input                   2.77
18            RGB Power                 7.94          45              lack strech delay filter               2.6
19               R input                2.21          46                   Video output                      2.12
20               G input                2.36          47            Auto phase control filter                3.5
21               B input                2.28          48                  VCO COLL                           4.3
            Line synchronized
22                                        0           49                  VCO COLL                           4.3
          Field sawtooth wave
23                                      2.47          50                 FILL FILTER                         2.24

24          Field incline gain          2.65          51                Outer sound input                    2.12
25               Power                  5.10          52                    SIF output                       1.95
26             AFC filter               2.49          53           SIF auto phase control filter             2.38
27             Line output              0.63          54                    SIF input                        3.14

2. Service mode and adjusting items and data

1. Method
 a.            Press PRO button to enter the adjustment or setup mode.
 b.            Press CH+ or CH- button to turn page up or down for desired item options. If a special remote
      controller is used for options, part of adjustment items can be selected directly by pressing buttons on the
      remote controller.
 c.            Press VOL+ or VOL- button to alter the value of selected adjustment items.
 d.            In the factory production process, the factory adjuster is sued for accelerated adjustment.
                                                                            Circuit Explanation
2. Notices for adjustment
           OSD                                                                    Range           Ref.
   B/W     BALANCE
           S-BRI                                                                  0-127           80
          R-BIA                                                                   0-255           82
          G-BIA                                                                   0-255           180
          B-BIA                                                                   0-255           144
          R-DRV                                                                   0-127           58
          G-DRV                                                                    0-15            7
          B-DRV                                                                   0-127           63
          C. B/W                                                                   0-3             0
         H. PHASE                                                                  0-31           17
       H.BLK.LEFT                                                                  0-7             7
      H.BLK.RIGHT                                                                  0-7             0
          V. SIZE                                                                 0-127           39
          V. LINE                                                                  0-31           10
         V. POSE                                                                   0-63           56
           V. SC                                                                   0-31            0
         RF. AGC                                                                   0-63           20
       OSD H.POSI                                                                 0-127           10
       OSD V.POSI                                                                  0-31            3
      VOLUME OUT                                                                  0-127           100
    STEREO OPTION                                                                  0-1             0
        SUB.CONT                                                                   0-31           20
       SUB.COLOR                                                                   0-63           25
       SUB.SHARP                                                                   0-31           10
         SUB.TINT                                                                 0-63            32
      BLK.STR.DEF                          ( 0On; 1: Off)                          0-1             0
         AFC GAIN                          (0: Low; 1: Hi)                         0-1             1
         V.SEPUP                           (0: Low; 1: Hi)                         0-1             1
         CD.MODE                   (LA76814: 0/1; LA76812: 0~7)                    0-1             0
      DIGITAL OSD           (0: Simulation OSD input; 1: Digit OSD input)          0-1             0
        OSD CONT.                     (0~127) / LA76814 (0~3)                      0-3             2
                                                                  Circuit Explanation

GRAY MOD                           (0/1)                                 0-1             0

    OSD                           Description                           Range           Ref.
  B.GAM.SEL                           (0~3)                              0-3             3
 RG.GAM.DEF                           (0/1)                              0-1             0
 FBPBLK.SW                            (0/1)                              0-1             0
BRIGHT ABL.TH            Bright. Abl. Threshold (0~7)                    0-7             4
EMG.ABL.DEF                   Emg. Abl. Def (0/1)                        0-1             1
 BRT.ABL.DEF                   Brt. Abl. Def (0/1)                       0-1             1
 MID.STP.DEF                   Mid. Stp.Def (0/1)                        0-1             1
 R-Y/B-Y G.BL           R-Y/B-Y Gain Balance (0~15)
                                                                         0-15            8
                          LA76814, no this function
 R-Y/B-Y ANG                R-Y/B-Y Angle (0~15)                         0-15            8
  C.KILL.OFF                   C_Kill OFF (0/1)                          0-1             0
  SND.TRAP                     Sound Trap (0~7)                          0-7             4
   VOL.FIL                 "Volume Filter Defeat"                        0-1             0
  VIF.SYS.SW            (0:45.75M; 1:58.75M) LA76814                     0-1             0
 VIDEO.LEVEL                   Video Level (0~7)                         0-7             7
  FM.LEVEL                      FM Level (0~31)                          0-31           16
POWER OPTION         0: 2 starts; 1: memory; 2 or 3: 1 start             0-3             0
SEARCH CHECK               0: w/out start auto search;                   0-1
                             1: w/ start auto search
SEARCH SPEED             0: search slow; 1: search fast                  0-1             1
  AV OPTION      0: w/out AV; 1: 1-way AV input; 2: 2-way AV
                                                                         0-3             1
                           input; 3: 3-way AV input
 POSITION L/R        0: top left corner; 1: top right corner             0-1             1
 BLACK BACK             0: No black back; 1: Black back                  0-1             1
BLACK TRANS                                                              0-1             1
 V.MUTE P.OFF    0: video output not cut before POWER OFF;
                                                                         0-1             0
                    1: video output cut before POWER OFF
 CCD OPTION             0: CCD not used; 1: CCD used                     0-1             1
V-CHIP OPTION        0: V-CHIP not used; 1: V-CHIP used                  0-1             1
PASSWORD OPT.        0: V-CHIP not used; 1: V-CHIP used                  0-1             1
TUNER OPTION    0:TDF-3M3 not used; 1: PHILIP UV1336B used               0-1             1
SCREEN OPTION   0:w/out curtain; 1: w/ at start; 2: w/ at close; 3:
                                                                         0-3             0
                                w/ at start/close
 SCREEN TIME                                                             0-7             6
 SCREEN HDC                                                              0-63            0
                                                                                     Circuit Explanation

         BAND SELECT                                                                           0-1             0
3.Circuit signals processing

(1) MF amplifying circuit
Received by antanna and processed by the high frequency tuner, the television signals will be transmitted by the
tunner as 45.75MHZ signals to sound surface filter through C112 coupling after being amplified by V102, and
then the MF signals of trapped wave in sound carrier wave from sound surface filter F45U will be sent to pin 5
and 6 of LA76814. The MF demodulation circuit of this TV set is completed through PLL carrier wave
generator and outside pressure control oscillator (T101) in LA76814. The MF frequency is adjusted by T101
adjustment, and output of AFC is generated by a numerical control IF-PLL circuit, and read and sent to CPU by
I2C bus for correction of MF signals frequency deviation. The external capacitor of pin 3 decides the time
constant of AGCand high frequency amplication AGC will be transmitted by I2C bus through pin 4 for control
of high frequency tuner gain.

(2) Sound signals processing
The secondary sound MF signals are input via pin 54 of LA76814, and then demodulated in PLL tuner through
lowpass and limit inside LA76814. After demodulation, the sound signals will be amplified through inside
lowpass and transmitted via pin1. Pin 2 is FM output, C121 is deaccentuation capacitor, pin 9 is FM detector's
DC filter connector and C117 is filter capacitor. The external AUDIO signals are input via LA76814 pin 51,
controlled by CPU. A swith inside I2C bus control LA76814 can be used for options of internal and external
signals. The sound signals are transmitted via LA76814 pin 1 to LA4225A pin 1 via C601 coupling and
transmitted from its pin 4, after being amplified by LA4225A, to the speaker. The mute circuit 1 is comprised
of V601, V602 and other components for Power On and Off mute. Circuit 2 is comprised of CPU mute pin
V603 and other components.

(3) Line sync processing circut
The line oscillation circuit of the TV set is fully comprised of LA76814 internal integrated components. The
brightness signals containing compound sync signals are transmitted to the internal sync seperation circuit for
line and field sync pulse.

(4) Line output circuit
Standard line oscilation pulse is output via pin 27 to V431 for line drive. T431 is H (L) drive used to convert the
low current and high pressure pulse signals from line tube into low voltage and large current signals for line
export needs. V432 is line output, C435 and C436 are reciprocal capacitor, C441 is S calibration capacitor,
L441 is line linear indutance and T471 is line output transformer. 240V voltage needed for field scanning is
transmitted via winding 10 of the transformer and gained after being rectified by VD472. In addition to anode
                                                                                  Circuit Explanation

high pressure, screen grid and focus voltages, the transformer provides 180V video amplifier voltage by
winding 2. VD411, C411, R412, VD412, R414 and C412 form the X ray protection circuit. R233, C231, R232,
R403 and C408 form the beam restriction circuit. The winding 9 of the transformer provides CRT filament

(5) Field sync and output circuit
Field sync seperator produces field sync signals from compound sync signals and activates the field frequency
splitting system. When a certain number field sync pulse is detected, the field frequency spliting system will
start operation for frequency spliting of the muliple line frequency signals generated by the line frequency
oscilator. The field pulse gained from frequency spliting will be sent to field sawtooth generator for sawtooth
waves, and then transmitted by pin 23. The output circuit of this TV set is mainly comprised of LA7840 and
other components.

(6) CRT output circuit
The tricolor signals produced by LA76814 will be transmitted to CRT board and then to the cathode of the TV
tube after being amplified by videoamplifier which is comprised of V902, V912 and V922.

(7) CCD performance
The CVBS signals produced by LA76814 pin 40 will be amplified and sent to N701 pin 19 via V821 and then
processed by software and hardware inside CPU. The decoded CCD signales will be transmitted to LA76814
pin 14, 15 and 16 via CPU pin 22, 23 and 24.

(8) V-CHIP performance
Performance of V-CHIP is mainly completed by CPU. The CPU receives grade signals from the IC bus and
executes relative performances and shields those programs of relative grade.

4. Electric diagram (see attached page)

IV. Integrated circuit reference

1. All integrated circuit voltages

Following voltage data is achieved while the TV set is turned on, and the electric resistance is achieved when
the TV set is turned off. When the status changes, the data should also be changed. So these data are used as
                                                                                   Circuit Explanation
1. N701 LC863424B

     PIN            Leads Function         Voltage (V)     PIN               Leads Function           Voltage (V)

     1          Auto adjust Enable Pin        5.1          19            OSD red signal output          0.09

     2                  Blank                              20           OSD greem signal output         0.09

     3                 IIC data               4.6          21           OSD blue signal output          0.09

     4                 IIC clock              4.5          22           OSD blank signal output         0.01

     5                   Earth                 0           23                    Blank                   5.1

     6                                        2.2          24               MUTE control                0.02
                Crystal oscillation port
     7                                       2.75          25                    Blank                  5.07
                Crystal oscillation port

     8               Power (+5V)              5.1          26              AV  2                        0.01

     9            Plate control input        0.25          27             Av option control 1           0.01

     10            AFT signal input           0.3          28             Control signal input           5.1

                                                                      Right channel sound volume
     11                 Blank                              29                                           0.01
                                                                        PWM output port

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