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LC-27U7_LC-32U5


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LCD TELEVISION




       LC-27U7
       LC-32U5




                 Canada
                                                 CONTENTS


Safety instructions...................................................................................... 1
Adjustment instructions .............................................................................. 3
Working principle analysis.............................................................................6
Block diagram........................................................................................... 7
IC block diagram.........................................................................................8
Wiring diagram ......................................................................................... 12
Troubleshooting......................................................................................... 13
Schematic diagram          ................................................................................ 19
APPENDIX-A: Main assembly list
APPENCIX-B: Exploded view
Attention: This service manual is only for service personnel to take reference with. Before
servicing please read the following points carefully.

Safety instructions
1. Instructions
Be sure to switch off the power supply before replacing or welding any components                 or
inserting/plugging in connection wire Anti static measures to be taken (throughout the entire
production process!):
a) Do not touch here and there by hand at will;
b) Be sure to use anti static electric iron;
c) It's a must for the welder to wear anti static gloves.
Please refer to the detailed list before replacing components that have special safety requirements.
Do not change the specs and type at will.

2. Points for attention in servicing of LCD
2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to
use the screen of the original model for replacement.
2.2 The operation voltage of LCD screen is 700-825V. Be sure to take proper measures in
protecting yourself and the machine when testing the system in the course of normal operation or
right after the power is switched off. Please do not touch the circuit or the metal part of the module
that is in operation mode. Relevant operation is possible only one minute after the power is
switched off.
2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or
damage to the set.
2.4 Never operate the set or do any installation work in bad environment such as wet bathroom,
laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc.
Otherwise bad effect will result.
2.5 If any foreign substance such as water, liquid, metal slices or other matters happens to fall into
the module, be sure to cut the power off immediately and do not move anything on the module lest it
should cause fire or electric shock due to contact with the high voltage or short circuit.
2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at
once. Likewise, if the screen is not working after the power is on or in the course of operation, the
power must be cut off immediately and no more operation is allowed under the same condition.
2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the
power is off because in this case relatively high voltage still remains in the capacitor of the driving
circuit. Please wait at least one minute before the pulling out or plugging in the connection wire.
2.8 When operating or installing LCD please don't subject the LCD components to bending, twisting
or extrusion, collision lest mishap should result.
2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it's necessary
to pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and
ensure full grounding for all the parts that have to be grounded.
2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or
moving the set please take care not to touch or scratch them. Once they are damaged the screen

                                                   1
would be unable to work and no way to get it repaired.
2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to
breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case
before the transportation or handling.
2.12 For the storage make sure to put it in a place where the environment can be controlled so as to
prevent the temperature and humidity from exceeding the limits as specified in the manual. For
prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one
place. The ambient conditions are tabulated as follows:
                   Temperature      Scope for operation           0 ~ +50 oC
                                      Scope for storage          -20 ~ +60 oC
                     Humidity       Scope for operation          20% ~ 85%
                                      Scope for storage          10% ~ 90%
2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the
screen, as commonly called "ghost shadow". The extent of the residual picture varies with the
maker of LCD screen. This phenomenon doesn't represent failure. This "ghost shadow" may remain
in the picture for a period of time (several minutes). But when operating it please avoid displaying
still picture in high brightness for a long time.

3. Points for attention during installation
3.1 The front panel of LCD screen is of glass. When installing it please make sure to put it in place.
3.2 For service or installation it's necessary to use specified screw lest it should damage the screen.
3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between
the screen and the glass will affect the receiving and viewing effect
3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and
insulation please take care to keep it in intactness so as to avoid hidden trouble.
3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.




                                                  2
Alignment instruction
1 Alignment equipment
     PM5518 (video signal generator)
     K-7253 (VGA signal generator)
     CA210 (white balancer)
2 Alignment flow-chart
     The alignment flow-chart is shown as fig-1


                                        Check DDC, HDCP KEY and CPU



                                            Factory initialization setup



                               IF channel voltage of TV and AGC voltage adjustment



                                          Support format of VGA pre-set



                    Adjustment for sub-brightness and white balance of VGA/HDMI (color
                    temperature 6500k, 9300k and 12000k)



                      Adjustment for sub-brightness and white balance of YPbPr/YcbCr channel



                      Adjustment for sub-brightness and white balance of VIDEO channel



                                                 Preset ex-factory


                                        Fig-1 adjustment flow-chart
3 Unit adjustments
Connect digital board, CPU board and analog board according to wiring diagram, connect with
power and observe the display.
Method for entering factory menu: press "SLP", "DSP", "MENU" and "DSP" in turn to enter factory
menu; press "CH+" and "CH-" to select adjustment items and press "VOL+" and "VOL-" to adjust
value items, press "MENU" to exit.
Note: the white balance adjustment should be done under "nature" picture mode.

3.1 Initialization
Enter factory menu, select "Factory settings" sub-menu, and adjustment for items of table1.




                                                        3
                                    Table1 sub-menu adjustment

         Items         Range                                      Introduce

   PW on LOGO      ON/OFF          Display 5s LOGO of turn on the TV
   NO Sig LOGO     ON/OFF          If display LOGO in no signal
   Black Screen    BLUE/BLACK      If display blue screen and white noise wave in no signal, setting
                                   "BLUE"
   MLK             120-159         Adjustment for clock frequency (MHz) of memorizer, setting "145".
   PIP Size        Middle/Large    Select two component of PIP: "SMALL AND MIDDLE" and "SMALL
                                   AND BIG", setting "MIDDLE".
   init EEprom     Start?          Eeprom Initialization (adjustment for EEprom data)


3.2 Adjustment for AFT voltage and AGC voltage of IF channel in TV
Input frequency for 45.75MHz and IF signal for 80dBV of TP1, adjust L107 to value 2.4v of TP2;
when increase 0.10MHz of TP1 input signal, the TP2 value 1.0v at least; but decrease 0.10MHz of
TP1 input signal, the TP2 value 4.0v at least.
3.3 VGA/DVI channel adjustment
3.3.1 Preset VGA channel mode
Input VGA signal (PATTERN: CROSS) of VG-849 or VG-848, select PROG850(640*400/85Hz),
auto adjustment until the screen is filled with picture. Use the same method to do auto adjustment
for the following items:
     PROG851(640*480/72 Hz)           PROG852(640*480/75 Hz)          PROG853(800*600/56 Hz)
     PROG854(800*600/60 Hz)           PROG855(800*600/72 Hz)          PROG856(1024*768/60 Hz)
     PROG857(1024*768/70 Hz)          PROG858(1280*768/75 Hz)         PROG888(800*600/75 Hz)
     PROG915(1152*870/75 Hz)          PROG915 (1280*1024/60Hz)


3.3.2 Sub-brightness and White balance adjustment VGA/HDMI channel
a. Input VG-849 or VG-848 signal of VGA: PROG852(640* 480/75Hz) and eighth level gray-scale
signal of PATTERN. Use color analyzer CA210 to adjust sub-brightness and white balance.
b. Enter submenu of COLOR TEMP., Select 9300k of color temperature, set auto value of R, G and
B to 50. Enter submenu of white balance, preset value of offset_R, offset_G and offset_B to 125,
and preset value of gain-R, gain-G and gain-B to 100. Adjustment for brightness let the second level
brightness be 3nit at least.
c. Fixed value of offset_B, adjust offset_R and offset_G, let the color coordinate of the second level
be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value of
gain_B, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285 and 293.
Adjustment offset_R, offset_G, offset_B, gain_R, gain_G and gain_B repeatedly until the value of
the two levels gray-scale be 285 and 293.
d. Select 6500k of color temperature, set auto value of R, G and B to 50. Fixed value of B to 50,
adjust R and G, let the color coordinate of the sixth level be 313 and 329. Adjust R and G repeatedly
until the color coordinate value to 313 and 329.
e. Select 12000k of color temperature, set auto value of R, G and B to 50. Fixed value of B to 50,
adjust R and G, let the color coordinate of the sixth level be 270 and 283. Adjust R and G repeatedly
until the color coordinate value to 270 and 283.

                                                  4
f. Input PROG852(640*480/75Hz) and the eighth level gray-scale of PATTERN signal of VG-849 to
HDMI, repeatedly the b-e course. In the HDMI channel, preset value of offset_R, offset_G and
offset_B to 15, preset value of gain_R, gain_G and gain_B to 25.

3.4 Adjustment for sub-brightness and white balance of YPbPr channel
a. Connect YPbPr signal of VG-849 and VG-848 to YPbPr terminal, input color signal of
PROG973(1080i)PATTERN964. Select AUTOTUNE item, wait for it displays "OK". NOTE: Don't
select AUTOTUNE item in other state.
b. Switch YPbPR signal of VG-849 and VG-848 output to the eighth gray-scale signal of
PROG973(1080i)PATTERN964. prset value of offset_R, offset_G and offset_B to 15 and gain-R,
gain-G and gain-B to 25. adjust brightness, let second bright to 3nit at least.
c. Fixed value of offset_B, adjust offset_R and offset_G, let the color coordinate of the second level
be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value of
gain_B to 25, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285
and 293. Adjustment offset_R, offset_G, gain_R and gain_G repeatedly until the value of the two
levels gray-scale be fixed.
d. Input PROG977(720p), PROG978(480p) and PROG968(480i) mode for eighth level gray-scale
signal, let the color coordinate of the second level and the seventh level 285 and 293.

3.5 VIDEO channel adjustment (TV/VIDEO/S-VIDEO)
a. Connect color bar signal of AV (PM5518, NTSC , eight level gray-scale signal) to VIDEO1
terminal, enter factory menu, preset value of offset_R, offset_G and offset_B to 15 and gain-R,
gain-G and gain-B to 25, adjust brightness, let second bright to 3nit at least.
b. Fixed value of offset-B to 15, adjust offset_R and offset_G, let the color coordinate of the second
level be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value
of gain_B to 25, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285
and 293. Adjustment offset_R, offset_G, gain_R and gain_G repeatedly until the value of the two
levels gray-scale be fixed.

4 Performance check
4.1 TV function
Enter searching menu  auto search, connect RF-TV terminal with central signal source and check
if there are channels be skipped
4.2 AV/S, YpbPr terminals
Input AV/S, HD signal, check if it is normal.
4.3 VGA terminal
Insert VGA terminal, input VGA format signal of 640 X 480@60 Hz, check if the display is normal. If
interference exists, press the auto adjusts button on remote control again and check if it is normal.
4.4 HDMI terminal
Insert HDMI terminal, input signal of 640 X 480@60 Hz signal and check if the display is normal.
4.5 check sound channel
Check the speaker and headphone of each channel.
4.6 presetting before ex-factory



                                                   5
          Item        Setting           Item         Setting            Item        Setting
     Picture mode    NATURE        OSD language      English           CCD           OFF
      Sound mode     NORMAL         HALFTONE           50            STEREO           ON
          N/R         WEAK          DURATION           30           VGA/HDMI       NORMAL
       SCREEN          FULL           MAG.C            ON            ANTENNA         CATV


Working principle analysis
RF signal from the antenna to tuner, via high frequency amplifier and mix frequency to obtain IF
signal, and then via pre-IF amplifier in V104, then it send to processed IF filter of SAW (Z103),
obtain more idea IF speciality, it processed to IF amplifier, phase locked logic VCO and sync
detection of N101 (M52760E) in the TV board to obtain VIDEO; IF via pre IF amplifier to send to
processed filter of SAW (Z102), again send to processed IF amplifier of N101, decode second SIF.
From M52760E output VIDEO, AV1 and AV2/S signal all send to video decoder N601
(TVP5147PFP), via video select, clamping, A/D transfer, comb filter and color decode, one way
output AV OUT, another way output 8bit for CIR656 format signal and CLK signal, send to
N101(MST6151) of CPU board, Also YPbPr, VGA and HDMI send to N101. N101(MST6151) is
many function big dimension integrate circuit, it processed HDMI, A/D to D/A switch, interlaced and
non-interlaced processing, model switch and low voltage difference output functions and so on, it
send to four ways difference signal and one way clock signal to LCD display.
From HDMI input to MST6151contain sound signal, via processed MST6151, send to processed
D/A switch for NA01(CS4340), output L/R of HDMI.
L/R of HDMI from CS4340 output, L/R of YPbPr and VGA/DVI signal via sound switch
NA02(HEF4052) to select, then send to sound processing N801(MSP3425G); L/R signal for AV1
and AV2/S input send to N801 via selected switch N701(HEF4052),and SIF of TV output from
M52760E send to N801 too. In MSP3425G, the demodulated L/R of SIF and the input L/R from
other two ways, via selected switch and processing sound, then output signal, one way sound
output for AV OUT, other way send to N401(TPA3008D2) of sound amplifier, via amplify for sound
signal to speaker and earphone.
The unit working is controlled N801(MTV412) of CPU, connect tuner, TVP5147 and MSP3425G to
IIC bus; connect MST6151 to parallel BUS.




                                                6
Block diagram


  HDMI-A        AUDIO                                                        AV-A OUT
YPbPr-A          SW
VGA/DVI-A       NA02                   L/R           AUDIO
                HEF4052
                                                     PROCESSOR
                                                                             L/R   AUDIO AMP
                                                     N801
AV1-A           AUDIO                 L/R                                          N401
                                                     MSP3425G
                 SW                                                                TPA3008D2
AV2/S-A         N701
                HEF4052                                                             L/R
                                                     SIF
                           SAW
RF                         Z102            IF AMP
        TUNER                                                                           SPEAKER
                      IF                   N101(TV board)
                           SAW             M52760E
                           Z103              V                   IIC         HEADPHONE



AV-V OUT              VIDEO
                                                           SCALER
VIDEO1                 DECORDER        CCIR656             A/D  D/A
Y/VIDEO2              N601             8bit                DEINTERLACER
C                     TVP5147PFP
                                                           LVDS                         PANEL
YPbPr                                                      HDMI
VGA
HDMI/DVI                                                   N101(CPU board)
                           DAC                             MST6151DA
     HDMI-A                NA01
                L/R        CS4340

                                     BUS                   SDRAM       SDRAM
                                                           N201        N202
           EEPROM
           N802                     MCU
                                    N801
           EEPROM                   MTV412
           N803




                                                 7
IC block diagram
TVP5147


                               Copy                                                                          VBI
                                                                      CVBS/Y                                Data
                             Protection
                              Detector                                                                    Processor

                   Analog
                  Front End
        VI_1_A                                                                              Composite and S-Video Processor
CVBS/   VI_1_B
 C/Pb                                                                                                     Y/C
        VI_1_C                                                       CVBS/Y                                           Y     Luma                            Y[9:0]
                                                                                                 Separation
                                                                                                                          Processing   YCbCr     Output
                                                                                                         5-line                                 Formatter
        VI_2_A                                                       C/CbCr                                           C    Chroma
CVBS/             Clamping                                                                         Adaptive
        VI_2_B                                                                                                            Processing                        C[9:0]
  Y                 AGC                                                                                  Comb
        VI_2_C                                     M
                  2    11-Bit                      U
        VI_3_A        ADC                          X
CVBS/
        VI_3_B
 C/Pr
        VI_3_C



CVBS/Y VI_4_A

                                                                                                                                                            GPIO
                  Sampling
                  Clock                          Timing Processor
                                                                                                                                            Host
                                                With Sync Detector
                                                                                                                                          Interface
                                                       RESETB




                                                                                                 HS/CS
                                                                                       VS/VBLK
                                                PWDN




                                                                                                         GLCO
                                                                          AVID
                                                                                 FID




                                                                                                                                          SCL


                                                                                                                                                SDA
                                XTAL1
                                        XTAL2



                                                                DATACLK




80: AV OUT
2: TV-V input
7: AV1-V input
9: AV2-V/S-Y input
18: S-C input
29: SDA
28: SCL
40: CLK output
43-47, 50-52: CCIR656 format signal output
4, 5, 20, and 21: 3.3V-A power supply
38, 48, 61: 3.3V-D power supply
11, 25, 76: 1.8V-A power supply
31, 41, 55, and 67: 1.8V-B power supply




                                                                                                         8
M52760




2: AFT
3: AGC
4, 5: picture If input
7: sound IF input
13: SIF output
10: mono sound output
18: TV- VIDEO output
14, 17: +5V-1 power supply

MSP3425G




                             9
MST6151
207, 208: HDMI-R input
2, 3: HDMI-G input
5, 6: HDMI-B input
8, 9: HDMI-CLK input
14: HDMI-SDA
15: HDMI-SCL
20, 21: VGA-B input
22: VGA-G input
23, 24: VGA-G input
25, 26: VGA-R input
18: VGA H-sync input
19: VGA V-sync input
27, 28: PB input
29, 30: Y input
31: HDMI-G input
32, 33: PR input
54-61: CCIR656 format signal input
53: CLK input
164-171, 174: 4 difference signal output
160, 161: 1 clock signal output
188-191: HDMI sound output
200: PWW (brightness control switch) output
72-75: BUS (parallel communication signal)
49, 131, 195: 1.8V power supply
4,17,12,109,204,66,102: 3.3V power supply




                                              10
TPA3008




1: MUTE
3: R input
5: L input
20, 17: L input
41, 44: R input
15, 23, 33, 39, and 47: +18V power supply




                                            11
Wiring diagram




                 12
Trouble shooting
1. Fault clearance
Before servicing please check to find the possible causes of the troubles according to the table
below.
1.1 Antenna (signal):
 Picture is out of focus or jumping        Bad status in signal receiving
                                           Poor signal
                                           Check if there are failures with the electrical connector or
                                           the antenna.
                                           Check if the antenna is properly connected.
 Fringe in picture                         Check if the antenna is correctly oriented.
                                           Maybe there is electric wave reflected from hilltop or
                                           building.
 Picture is interfered by stripe shaped    Possibly due to interference from automobile, train, high
 bright spots                              voltage transmission line, neon lamp etc.
                                           Maybe there is interference between antenna and power
                                           supply line. Please try to separate them in a longer
                                           distance.
                                           Maybe the shielded-layer of signal wire is not connected
                                           properly to the connector.
 There appear streaks or light color       Check if interfered by other equipment and if interfered
 on the screen                             possibly by the equipment like transmitting antenna,
                                           non-professional radio station and cellular phone.


1.2 TV set:
 Symptoms                                Possible cause
 Unable to switch the power on               Check to see if the power plug has been inserted properly
                                             into the socket.
 No picture and sound                        Check to see if the power supply of liquid crystal TV has
                                             been switched on. (As can be indicated by the red LED at
                                             the front of the TV set)
                                             See if it's receiving the signal that is transmitted from other
                                             source than the station
                                             Check if it's connected to the wrong terminal or if the input
                                             mode is correct.
                                             Check if the signal cable connection between video
                                             frequency source and the liquid crystal TV set is correct.
 Deterioration of color phase or color       Check if all the picture setups have been corrected.
 tone
 Screen position or size is not proper       Check is the screen position and size is correctly set up.
 Picture is twisted and deformed             Check to see if the picture-frame ratio is properly set up.
 Picture color changed or colorless          Check the "Component" or "RGB" settings of the liquid
                                             crystal TV set and make proper adjustment according to the


                                                   13
                                          signal types.
Picture too bright and there is           Check if the contrast setting is too high.
distortion in the brightest area          Possibly the output quality of DVD broadcaster is set too
                                          high.
                                          It maybe also due to improper terminal connection of the
                                          video frequency signal in a certain position of the system.
Picture is whitish or too bright in the   Check if the setting for the brightness is too high
darkest area of the picture               Possibly the brightness grade of DVD player (broadcaster)
                                          is set too high.
No picture or signal produced from        Check if the cable is disconnected.
the displayer if "XXX in search"          Check if it's connected to the proper terminal or if the input
appears.                                  mode is correct.
There appears an indication -             Check if the TV set can receive input signal. The signal is
"outside the receivable scope)            not correctly identified and VGA format is beyond the
                                          specified scope.
Remote control cannot work                Check if the batteries are installed in the reverse order.
properly                                  Check if the battery is effective.
                                          Check the distance or angle from the monitor.
                                          Check if there is any obstruct between the remote control
                                          and the TV set.
                                          Check if the remote control signal- receiving window is
                                          exposed to strong fluorescence.
No picture and sound, but only            Check if the antenna cable is correctly connected, or if it
    hash.                                 has received the video signal correctly.
Blur picture                              Check if the antenna cable is correctly connected.
                                          Of if it has received the right video signal.
No sound                                  Check if the "mute" audio frequency setting is selected.
                                          Check if the sound volume is set to minimum.
                                          Make sure the earphone is not connected.
                                          Check if the cable connection is loose.
When playing VHS picture search           When being played or in pause VHS picture search tape
tape, there are lines at the top or       sometimes can't provide stable picture, which may lead to
bottom of the picture.                    incorrect display of the liquid crystal TV, In this case please
                                          press "auto" key on the remote control so as to enable the
                                          liquid crystal TV set to recheck the signal and then to
                                          display correct picture signal




                                                14
2. Identification criteria for the bright spot and dark spot of the LCD screen

                                           Quantity allowed                   Distance between two spots
Category        Criteria
                               15"      20"      22"     30"        40"    15"        20"      22"   30"    40"
              One single
                                5       2        5       2          3
                    spot
 Bright     Two
                                                                                               15mm
  spot      neighboring         2       1        2       1          1
            spots
               Total No.        5       2        5       2          3
                                                                          15mm
              One single
                                6       7        5       4          10
                    spot
  Dark              Two
                                                                                    10mm             5mm
  spots       neighboring       2       2        2       1          5
                  spots
               Total No.        6       7        5       4          10
Total defected point          8        7        5       4       /



Notes:
1. Definition of defected point (bright spot, dark spot): It is identified as a defected point if its area
exceeds 1/2 of a single picture element (R, G, B).
2. Definition of bright spot: It is identified as a bright spot if it is bright in the state of dark field and its
bright size remains unchanged
3. Definition of dark spot: It is identified as a dark spot if it is dark in the state of white field and its
dark size remains unchanged
4. Definition of two neighboring points: Defects of a group of picture elements (RB, RG, GB).




                                                       15
3.Troubleshooting guide
3.1 No raster

 Turn-on power supply, check                yes
 if the red indicator is light in
 the STANDBY?

                no


 Check if PIN8(5V) of CPU                 Press POWER button in the        red
 board is normal?                         unit button or sensor control,
                                          then check the indicator.

                                                         blue
                no
                                          Check if the PIN12 of X503 in
 Check STANDBY circuit of
                                          CPU board is high-level?
 power supply board
                                                         yes

                                           Check back light board

                                    no

                                                                no
                                Replacing N801                               Check if the PIN7 of X501 in
                                                                             CPU board is high-level?

                                                                                          yes


                                                                                 Check power supply board




                                                    16
3.2 Raster, but no picture



Check if the unit button            Does display OSD                     yes
                           yes
and sensor control                  menu in screen when
operation?                          press menu button?

   no
                            no                                           Check if the all
                                                              yes
                                                                         channels have signal?

                                                                                      no

                                                                                             HDMI/VGA/YPRP
                             Enter       factory-menu,                     Which is no
                             initialization EEPROM,                        signal   of
 Replacing          no       then turn off the TV,                         channels
 CPU board                   turn on again, display
                                                                                      TV         Replacing
                             picture?
                                                                                                 CPU board
                                            yes

                                 Adjust CPU board
                                     again
                                                                         Check if 1VPP signal
                                                          yes            and noise wave of
                                                                         X12 (PIN 1) in the
                                                                         TV board?


                                                                                      no


                                                                           Check if output
                                             Replacing              no     IF signal of
                                             TUNER1                        TUNER1 (pin
                                                                           11) is normal?

                                                                                      yes

                                                                               Check N101




                                                         17
3.3 no sound


        Check if PIN15, PIN30         Check PIN26 and
                                yes                          yes
        and PIN38 voltage of          PIN27 output wave of         Replacing N401
        N401 is normal?               N801

                    no
                                                   no

         Check power supply
                                      Check PIN13 output
                                                             yes
                                      wave of N101
                                                                   Replacing N801


                                                   no

                                                             yes
                                      Check PIN5 wave of           Replacing N101
                                      Z102

                                                 no

                                      Check PIN11 wave of
                                      TUNER1

                                                 no


                                       Replacing TUNER1




                                            18
CPU board
page 1 of 8
CPU board
page 2 of 8
CPU board
page 3 of 8
CPU board
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CPU board
page 5 of 8
CPU board
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CPU board
page 7 of 8
CPU board
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Video processing board
Video processing board
Key board
IR receive board
27" Power board
32" Power board
APPENDIX-A: Main assembly (LC-27U7)

           NAME                  NO.              MAIN COMPONENT AND it'S NO.
Video processing board   667-L32U5-40      N101      M52760 (352-52760-10)
                                           N801      MSP3425G (353-34250-10)
                                           N401      TPA3008D2 (353-30080-10)


CPU board                667-L27U6-56A     N101      MST6151DA (353-61510-10)
                                           N601      TVP5147 (353-51470-10)
                                           NA01      CS4340 (353-43400-30)
                                           N801      MTV412 (353-04120-10)


IR board                 667-L27U6-09
Keypad board             667-L27U6-05
Power supply board       667-L27U6-20
Remote control           301-RL27U6-27MD   RC-R27M-0D
Panel                    335-27001-00      V270W1-L04




Main assembly (LC-32U5)

           NAME                  NO.              MAIN COMPONENT AND it'S NO.
Video processing board   667-L32U5-40A     N101      M52760 (352-52760-10)
                                           N801      MSP3425G (353-34250-10)
                                           N401      TPA3008D2 (353-30080-10)


CPU board                667-L32U16-56A    N101      MST6151DA (353-61510-10)
                                           N601      TVP5147 (353-51470-10)
                                           NA01      CS4340 (353-43400-30)
                                           N801      MTV412 (353-04120-10)


IR board                 667-L32U5-09
Keypad board             667-L27U6-05
Power supply board       667-L32U18-20
Remote control           301-RL27U6-27MD   RC-R27M-0D
Panel                    335-32013-00      V320B1-L01
APPENDIX-B Exploded View LC-27X7
                     LC27U7

         PART LIST OF EXPLODED VIEW

NO.         DESCRIPTION               PART#
 1      TRANSFER AXIS COVER        808-10688-AF0
 2          HOLDER ASSY            615-10429-AR0
 3    REAR CABINET COVER(RIGHT)   808-10687-AF0A
 4        IR RECEIVER BOARD        667-L27U6-09
 5          LED COLUMN             700-60215-100
 6       POWER BOARD ASSY          667-L27U6-20
 7
 8     POWER SOCKET BRACKET        870-20955-AF0
 9     VIDEO PROCESSING BOARD      667-L27U6-40
10         DISPLAY SCREEN           335-27001-00
11          SPEAKER ASSY            615-20453-00
12         FRONT CABINET          780-T07W0JAR0Y
13           PMMA PANEL            808-2A366-232
14    LCD PANEL FIXED BRACKET       615-10521-00
15         CPU BOARD ASSY          667-L27U6-56A
16    WALL MOUNT BRACKET ASSY      615-10482-00A
17          REAR CABINET          780-T06WHJAF8B
18    REAR CABINET COVER(LEFT)    808-10689-AF0A
                                                                                                                             16
                                                                                                             15
                                                                                                        14
                                                                                                12 13
                                                                                      11
                                                                                 10
                                                                        8   9
                                                                   7
                                                               6
                                                      5
                                              3   4
                                     1
                                                                                                                                  17
                                                                                                                        18
                                                                                                                   19
                                                                                                              20
                                                                                                 21
APPENDIX-B Exploded View




                                                                                           22
                                                                            23
                                                                       24
                                         26
                                                          25
                           LC-32U5
                PART LIST OF EXPLODED VIEW

NO.          DESCRIPTION                      PART#
 1              Back cover                808-10756-AF0
 2            Left side cover             808-10757-AF0
 3           Right side cover             808-10758-AF0
 4          Button board assy             667-L27U6-05
 5           Rear cabinet assy           611-G05RPJAF1
 6                Screw                    851-23010-14
 7     Wall mount bracket (middle)        870-10133-00B
 8    Wall mount bracket (horizontal)     870-10218-00B
 9     Wall mount bracket (vertical)       870-10219-00
10    Panel trans-connecting support       803-10245-00
11          Guide orbit (upper)            870-30146-00
12         Digital board baffle           804-2A441-00D
13           CPU board assay             667-L32U16-56A
14       Power supply board assy          667-L32U18-20
15             Speaker assy                615-20435-00
16             LED column               700-60241/60242 -00
17             Front cabinet            780-G05W2JAR2B
18                Screw                    855-A0029-00
19              LCD panel                  335-32002-00
20           Video processor              667-L27U6-40A


22       LCD panel fixed support           615-10538-00
23             Power socket                364-23207-00


25                Stand                    615-10464-07
26          Transfer axis cover           808-10759-AF0
603-L27U70-16
Ver.1.0



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