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CM800


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                                   S/G No.:TCM800SEF0


Service Manual
Color Television

CHASSIS : CM-800S/801S
Model : DTA-21XXMZF/MTF/MEF/NZF/BZF
             DTA-21SXMZF/MTF/MEF/NZF/BZF




    Caution
    : In this Manual, some parts can be changed for improving. their
      performance without notice in the parts list. So, if you need the
      latest parts information, please refer to PPL(Parts Price List)in
      Service Information Center.




                                                         APR. 2006
1. MOBEL DISCRIPTIONS OF CM-800S/801S CHASSIS                                             ........................ 2
2. SPECIFICATIONS             .......................................................................................
                                                                                                                  4
3. SAFETY INSTRUCTION                 ..............................................................................5
4. DESCRIPTION OF CM-800S/801S CHASSIS                                   ..........................................6
5. ALIGNMENT INSTRUCTIONS                      .....................................................................
                                                                                                                 9
6. RECOMMANDED EEPROM DATA FOR CM-800S/801S                                               ........................ 17
7. ELECTRICAL PARTS LIST ..............................................................................18
8. DIFFERENT PARTS LIST FOR EACH MODELS                                  ..........................................34
9. SCHEMATIC DIAGRAM                  ..............................................................................38
10. PRINTED CIRCUIT BOARD                      .....................................................................
                                                                                                                 42
11. MECHANICAL EXPLODED VIEW AND PARTS LIST                                      ................................. 44
12. TROUBLE SHOOTING CHARTS .....................................................................
                                                                                              46




                                                          1
1. Model Descriptions of CM-800S Chassis

                                                             Suffix
                        Enclosure
    Model name         construction
                                        1st suffix*       2nd suffix*       3rd suffix*
                          type
   DTA-21A8***                 A8
                                                                          The 3rd suffix*
   DTA-21A9***                 A9
                                                                              can be
   DTA-21A7***                 A7
                                                        The 2nd suffix*     Blank or B
   DTA-2132***                 32     The 1st suffix*
                                                            can be
   DTA-2130**                  30         can be
                                                          EF, PF, ZF
   DTA-2131**                  31       M, N or B
                                                             or TF
   DTA-2134**                  34                                            No suffix
   DTA-21F2**                  F2
   DTA-21U8**                  U8

Explanation of the suffix :

- The 1st suffix * can be M,N or B denoting NTSC and BOOSTER function
  as following table 1.
- The 2nd suffix * can be EF,PF,ZF or TF denoting PIP and TELETEXT function
  as following table 2.
- The 3rd suffix * can be Blank or B denoting the colour of front enclosure
  as following table 2.

Table 2.

                                           PIP            TELETEXT            Colour of
     2nd suffix*        3rd suffix*
                                         Function          function       front enclosure
                                                                          Silver and black
                              Blank
                                                                             (Two tone)
           EF                                                With
                                                                                Silver
                               B
                                                                             (One tone)
                                           With
                                                                          Silver and black
                              Blank
                                                                             (Two tone)
           PF
                                                                                Silver
                               B
                                                                             (One tone)
                                                            Without
                                                                          Silver and black
                              Blank
                                                                             (Two tone)
           ZF
                                                                                Silver
                               B
                                                                             (One tone)
                                         Without
                                                                          Silver and black
                              Blank
                                                                             (Two tone)
           TF                                                With
                                                                                Silver
                               B
                                                                             (One tone)




                                             2
Table 1.

            1st suffix*                     NTSC Function                    BOOSTER Function
                 M                             Without
                                                                                     Without
                 N                              With
                 B                             Without                                With


2. Model Descriptions of CM-801S Chassis

                              Enclousure                                   Suffix
    Model name             construction type
                                                          1st suffix*                 2nd suffix*
                          (cosmetic change)
    DTA-21S7**                    S7              The 1st suffix* can be          The 2nd suffix* can
    DTA-21S8**                    S8                MEF, MZF or MTF                       be

There are no other differences between models.

Explanation of the suffix :

- The 1st suffix * can be MEF,MZF or MTF denoting PIP and TELETEXT function as follows.
- The 2nd suffix * can be Blank or B denoting the colour of front enclosure as follows.

                                                     PIP           TELETEXT                Color of
      Suffix**        1st suffix*   2nd suffix*
                                                   function         function           front enclosure
                                                                                           Two tone
           MEF                        Blank                                               (Silver and
                           MEF                          With             With                black)
                                                                                           One tone
        MEFB                            B
                                                                                            (Silver)
                                                                                           Two tone
           MZF                        Blank                                               (Silver and
                           MZF                                          Without              black)
                                                                                           One tone
        MZFB                            B
                                                                                            (Silver)
                                                   Without
                                                                                           Two tone
           MTF                        Blank                                               (Silver and
                           MTF                                           With                black)
                                                                                           One tone
        MTFB                            B
                                                                                            (Silver)




                                                    3
                                                      Chassis
           Items
                                      CM-800S                         CM-801S
TV Standard Color system         PAL/SECAM, NTSC-4.43 & 3.58(AV) *RF NTSC option
            Sound system                   B/G, D/K, I, H, M(NTSC Option)
Rated Voltage                                   AC 110-250V, 50/60Hz
Power consumption          74W                             74W
Sound Output Power         6W + 6W(at 1KHz 80% Mod.)       7W + 7W(at 1KHz 80% Mod.)

                           BAND I : CH 02 ~ CH04(48.25MHz ~ 62.25MHz)
                           BAND II : CH05 ~ CH12(175.25MHz ~ 224.25MHz)
Channel     VHF            CABLE BAND : S01 ~ S03(69.25MHz ~ 83.25MHz),
Conerage                                 S01 ~ S20, (105,25MHz ~ 294.25MHz)
                           HYPER BAND : S21~S41(303.25 ~ 463.25MHz)

            UHF            BAND IV, V : CH21 ~ CH69(471.25MHz ~ 855.25MHz)
Tuning System                                     FS Tuning System
Program No. Indication                           ON-Screen Display
Program Selection                                   200 Programs

                           AV1/2 input Rear 
                           AV1/2 input SIDE or FRONT
Aux. Terminal
                           DVD1(CVBS), DVD2(Y, Cr, Cb)
                           OUTPUT< Monitor OUT>

Remote Control Unit                                   R-55C03




                                            4
3 SAFETY INSTRUCTION



NOTE : BEFORE SERVICING THIS CHASSIS READ THE "X-RAY RADIATION PRECAUTIONS",
       "SAFETY PRECAUTIONS" AND "PRODUCT SAFETY NOTICE" BELOW.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid
   such hazards, the high voltage must not exceed the specified limit. The nominal value of the
   high voltage of this receiver is 25.6KV [Normal Type](27.9KV [Flat Type]) at max beam
   current. The high voltage must not, under any circumstances, exceed 28.6KV [Normal Type]
   (30.9KV [Flat Type]). Each time a receiver requires servicing, the high voltage should be
   checked. It is important to use an accurate and reliable high voltage meter.
2. The only source of X-RAY Radiation in this TV receiver is the picture tube. For continued X-
   RAY RADIATION protection, the replacement tube must be exactly the same type tube as
   specified in the parts list.

SAFETY PRECAUTION
1. Potentials of high voltage are present when this receiver is operating. Operation of the
   receiver outside the cabinet or with the back cover removed involves a shock hazard from
   the receiver.
 1) Servicing should not be attempted by anyone who is not thoroughly familiar with the
     precautions necessary when working on high voltage equipment.
 2) Always discharge the picture tube to avoid the shock harzard before removing the anode
     cap.
 3) Discharge the high potential of the picture tube before handling the tube. The picture tube is
     highly evacuated and if broken, glass fragments will be violently expelled.
2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the
   Replacement Parts List.
3. When replacing a high wattage resistor (metal oxide film resistor) in the circuit board, keep
   the resistor 10 mm away from circuit board.
4. Keep wires away from high voltage or high temperature components.
5. This receiver must operate between AC 110-250 volts, 50/60Hz. NEVER connect to DC
   supply or any other power or frequency.

PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this equipment have special safety-related
characteristics. These characteristics are often passed unnoticed by a visual inspection and the
X-RAY RADIATION protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc. Replacement parts which have
these special safety characteristics are identified in this manual and its supplements, electrical
components having such features are identified by designated symbol ` 1 ' on the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use
of substitutes replacement parts which do not have the same safety characteristics as specified
in the parts list may create X-RAY Radiation.



                                                5
4.1 BLOCK DIAGRAM




                    6
4.2 Overview of Main IC

 Pin Assignment of LA76968

  PIN                FUNCTION               PIN                FUNCTION
  1     SIF Output                          64    VIF Input1
  2     VIF AGC                             63    VIF Input2
  3     SIF Input                           62    IF Ground
  4     FM Filter                           61    RF AGC Output
  5     FM Output / Selected Audio Output   60    Video Output
  6     Audio Output                        59    AFT Filter
  7     SIF APC Filter                      58    APC Filter
  8     IF Vcc                              57    Black Level Det. Filter
  9     Ext. Audio Input or VM Output       56    Internal Video Input(S-C IN)
  10    ABL                                 55    Video/Vertical Vcc
  11    RGB Vcc                             54    External Video Input(Y IN)
  12    Red Output                          53    Chroma APC Filter
  13    Green Output                        52    Selected Video Output or fsc Output
  14    Blue Output                         51    Cr Input
  15    East/West Output                    50    4.43MHz Crystal
  16    V Ramp Osc. Capacitor               49    Cb Input
  17    Vertical Output                     48    Fast Blanking Input or DVD-Y
  18    VCO IREF                            47    Red Input or NC
  19    Horizontal/BUS Vcc                  46    Green Input or YC-Y
  20    Horizontal AFC Filter or YC-C       45    Blue Input
  21    Horizontal Output                   44    Flyback Pulse Input
  22    Video/Vertical/BUS Ground           43    CCD Vcc
  23    P00/INT0/SO0                        42    CPU Ground
  24    P01/INT1/SI0,SB0                    41    FILSCL
  25    P02/SCK0                            40    FILT
  26    P03/INT3                            39    RES#
  27    P14/SI1,SB1                         38    P13
  28    P15/SCK1                            37    P07/AN7
  29    P16/T1PWM/SO1                       36    P06/AN6
  30    P17/TVPWMD                          35    VDD
  31    P04/AN4                             34    XT2
  32    P05/AN5                             33    XT1




                                             7
Block Diagram of LV1116




                          8
5.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE

To switch the TV set into service mode please see instruction below.

1 - Select PR. number 91
2 - Adjust sharpness to minimum and exit all menus.
3 - Within 2 seconds press the key sequence : RED - GREEN - MENU

The SERVICE menu is displayed as below,

   S1         Heat Run              S7-2          Reg, 2
   S2         Screen                S7-3          PIP
   S3         Sound Test            S8-1          W&B
   S4         Reserved              S8-2          Scr W&B
   S5         AGC                   S9            Dp
   S6-1       4 : 3 GEO 50          S10-1         Option
   S11-1      4 : 3 GEO 60          S10-2         Device
   S11-2      16 : 9 GEO
   S11-3      ZOOM GEO              S12           Outgoing
   S7-1       Reg. 1

or Using the Service Remote controller, you can enter service mode directly.
To exit SERVICE menu press menu key or Stand By key.


5.2 SERVICE MODE NAVIGATION
Pr Up/Down remote keys : cycle through the service items available.
Vol -/+ remote keys : Dec./Increment the values within range - Cycle trough option bits.




                                              9
5.3. CONTROL BITS
There are 4 option bytes available (16 bits in all). These option bits are available from
FACTORY and SERVICE mode. First find the OPTION1, OPTION2, OPTION3 or OPTION4
control, and then use the UP/DOWN and PLUS/MINUS keys on the relevant remote keypad
to control the bits. The table below shows the three option bytes available;
Default setting in case of virgin EEPROM are shown in light grey.


  B7          B6         B5           B4           B3             B2       B1          B0
           TEXT
  TEXT TOP                            Teletext     NTSC M
1          FLOF                                                         TUNER OPTIONS
    `OFF'                  Fixed to   ON           OFF
             'OFF'                                                      (see table below)
                              `0'
  TEXT TOP TEXT                       Teletext     NTSC M                 default :sanyo
0
     'ON'  FLOF                       OFF          ON


  B7       B6            B5           B4        B3         B2              B1          B0
           Daewoo                     Koran
  Praytime               CRT
1          Logo                       functions
     `ON'                slim                     Local key option
           ON                         enabled                               Fixed to    Fixed to
                                                 (see table below)
           Daewoo                     Koran                                    `1'         `0'
  Praytime               CRT                     default :6key(11)
0          Logo                       functions
    `OFF'                normal
           OFF                        disabled


  B7          B6         B5           B4           B3             B2       B1          B0
    Curtain                                                       PIP
1
    OFF                                                           OFF
                                                       Fixed to             Fixed to    Fixed to
                   Teletext language table
                                                          `0'                  `0'         `0'
    Curtain                                                       PIP
0
    ON                                                            ON



  B7          B6         B5           B4           B3         B2           B1          B0
                                                   Koran
                                                                                       DVD
1                                                  direct key
                                                                                       OFF
      Not used, must be set to 1       Fixed to    enabled     Fixed to     Fixed to
        for future compatibility          `0'      Koran          `0'          `0'
                                                                                       DVD
0                                                  direct key
                                                                                       ON
                                                   disabled




                                                  10
5.4 USER GUIDE

5.4.1 ENTERING FACTORY MODE
To switch the TV set into FACTORY mode, use the factory remocon, and press on S10.
The factory menu will appear on the screen, showing "VER xx.xx DATE d xx m xx y xx"
(where xx.xx is the software version, "d xx m xx y xx" means date ).

5.4.2 ENTERING OPTION BITS MENU
To find the option bits, push the button S10 one more.
OPTION BITS TABLE as below will appear.

   ex).
             (S10-1)
             EPROM & OPTION & DEVICE EDIT

             Ver. xx.xx DATE dxx mxx yxx

                       7            bit        0 HEX
             OPTION1    1   0   1   1 1   0   0 1  B9
             OPTION2    0   0   1   1 1   1   1 0 3E
             OPTION3    1   1   1   1 0   1   0 0 F4
             OPTION4    1   1   1   0 1   0   0 0 E8


5.4.3 SELECTING OPTION BITS
From left to right, bits 7 to 0 are shown. Navigation is done from the with the factory remocon
with the VOL MIN and VOL MAX buttons. The selected bit is changed RED from BLUE.

5.4.4 TOGGLING OPTION BITS
This is done by using the PR UP and PR DOWN buttons.

5.4.5 CHANGING OPTION1,2,3,4
to go option2, go to the option1 with VOL left/right buttons.
and push the PR UP and PR DOWN buttons. Option1,2,3,4 are changed as below

   < OPTION1 -> OPTION2 -> OPTION3 -> OPTION4 -> OPTION1 >

5.4.6 EXITING OPTION BITS MENU
To exit from option bits table, Push the button S10 twice.




                                                 11
5.5 CONTROL DESCRIPTION

5.5.1 OPTION 1 BITS
FLOF/Fastext (Bit 6)
Enables/disables the TV from displaying FLOF row 24 link titles.

Teletext ON/OFF (Bit 4)
Enables/disables the Teletext on TV. If Teletext is disabled, user can not select clock prog
and in features menu.

NTSC M ON/OFF (Bit 3)
Enables/disables NTSC M function.

Tuner (Bits 2, 1 & 0)
Configures the software to communicate with the tuner via i2c bus. Incorrect configuration
may not be immediately obvious, but will result in loss of functionality (e.g. unable to tune
UHF channels, unable to tune some hyperband channels).

      Bit2        Bit1       Bit0        LNA                        Tuner
       0           0          0           No     Philips(external AGC)      UV1316A I-4
       0           0          1           No             Sanyo            115-B-8A86EU
       0           1          0           No               LG              TAEM-G008D
       0           1          1           No            Samsung         TECC2949PG35W
       1           0          0            -      Should not be used
       1           0          1            -      Should not be used
       1           1          0          yes               LG              TAEM-G605D
       1           1          1            -      Should not be used

5.5.2 OPTION 2 BITS
Daewoo Logo ON/OFF (Bit 6)
Enables/disables the display of Daewoo logo at power on.

CRT slim/normal (Bit 5)
You must enable this bit for slim CRT which need V-SHIFT adjustment.

Koran functions enabled/disabled (Bit 4)
Enables/disables the Koran function at power ON.
If OSD language is not Persian or Arabic, this function is disabled.




                                               12
Local key option (Bit 3 & 2)

                              11       10               01              00
      0 mV ~ 700 Mv           NC                Power(ST_BY on/off)
      700 mV ~ 1.40V         Menu                      Menu
      1.40V ~ 2.10 V       Prog. Up                  Prog. Up
      2.10 V ~ 2.80 V     Prog. Dwn Not used        Prog. Dwn         Not used
      2.80 V ~ 3.50 V       Vol. Up                   Vol. Up
      3.50 V ~ 4.20 V      Vol. Dwn                  Vol. Dwn
      4.20 V ~ 5.00 V       TV/AV                     TV/AV

5.5.3 OPTION 3 BITS
Curtain ON/OFF (Bit 7)
Enables/disables the curtain function at power ON.

Teletext language option (Bit 6, 5& 4)

                                                     Bit 6, 5& 4
                                 Latin West              000
                                 Latin East              001
                                   Russia                010
                                   Persia                011
                                   Arabic                100
                                 Automatic               101
                                     ...
                                 Automatic              111

recommend Automatic mode(111).

PIP ON/OFF (Bit 2)
Enables/disables PIP function.

5.5.4 OPTION 4 BITS
DVD ON/OFF (Bit 0)
Enables/disables DVD function.
0 DVD ON : RF -> AV1/AV2 -> DVD1 -> DVD2 -> GAME
1 DVD OFF : RF -> AV1/AV2 -> GAME

Koran direct key enabled/disabled (Bit 3)
When set to 1, pressing Yellow key makes the pray menu come on screen. When set 0, the
function is disabled. If OSD language is not Persian, this option bit is ignored.




                                               13
5.5.4 TV SET ALIGNMENT
(1) Screen (G2) Alignment (S2)
 (1)-1. Screen Alignment will be performed after sufficient Heat-Run of Set.
 (1)-2. Press the "S1" key of service remote controller to the heat run mode off.
 (1)-3. Receive the RETMA(or COLOR BAR) PATTERN.
 (1)-4. Press the "S2" key on the service remocon.
     #. Preparatory Focus (G1) Alignment
     - You must try to Focus Alignment roughly for exact SCREEN alignment.
     - Adjust the Focus VR of the FBT (T401) so that the center circle of RETMA Signal is
       clear and sharp.
 (1)-5. Turn round the Screen Volume of FBT until to the horizontal line of screen disappear.
 (1)-6. Press the "S2" key of service remote controller again.

(2) AUTO AGC Alignment (S5)
 (2)-1. Make sure option bits are correct for the tuner fitted on the chassis .
 (2)-2. Receive the COLOR BAR PATTERN(or similar pattern) of VHF-HIGH channel.
 (2)-3. Control the RF signal level at 62



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