Service Manuals, User Guides, Schematic Diagrams or docs for : LG TV MC-8CB chassis lg_chassis-mc-8cb

<< Back | Home

Most service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.




Image preview - the first page of the document
lg_chassis-mc-8cb


>> Download lg_chassis-mc-8cb documenatation <<

Text preview - extract from the document
                                                      ADJUSTMENT
Y Safety Precautions                                                  : Screen Voltage Adjustment
  1. It is safe to adjust after using insulating transformer
     between the power supply line and chassis input to                   Test Point    : RK (Red Cathode of CPT Board)
     prevent the risk of electric shock and protect the                   Adjust        : Screen Control of FBT
     instrument.
  2. Never disconnect leads while the TV receiver is on.
  3. Don't short any portion of circuits while power is on.              1) Tune the TV set to receive a color bar pattern.
  4. The adjustment must be done by the correct appliances.              2) Press PSM (RED) button on remote controller. (standard
     But this is changeable in view of productivity.                        picture)
  5. Unless otherwise noted, set the line voltage to                     3) Connect the probe of oscilloscope to the RK (Red
     230Vac!10%, 50Hz.                                                      Cathode) of CPT Board.
                                                                         4) Adjust Screen Volume of FBT so that the waveform is the
Y Test Equipment required                                                   same as below figure.
  1.   RF signal generator (with pattern generator)
  2.   DC Power Supply
  3.   Multimeter (volt meter)                                                                       Horizontal
                                                                                                     FlyBack Time
  4.   Oscilloscope                                                                                                     Black level
  5.   Color analyzer
                                                                                                                       150 3V for 25" LG CPT
                                                                                                                       150 3V for 29" LG CPT

                                                                                                                        White level
: RF AGC (Automatic Gain Control) Adjustment                                                                            GND for dc



   Test Point      : AGC TP (J2)                                             The waveform of RK(Red Cathode) of CPT Board
   Adjust          : Remote Control


  The RF AGC was aligned at the time of manufacture for
  optimum performance over a wide range conditions.                   : Focus Adjustment
  Readjustment of RF AGC should not be necessary unless
  unusual local conditions exist, such as ;                              NOTE: This adjustment should be performed after warming
                                                                                up for 10 minutes.
  1) Channel interference in a CATV system.
  2) Picture bending and/or color beats, which are unusually               Test Point    : Observing Display
     due to excessive RF signal input when the receiver is too             Adjust        : Focus control of FBT
     close to a transmitting tower or when the receiver is
     connected to an antenna distribution system where the RF
     signal has been amplified. In this case, the input signal           1) Tune the TV set to receive an inactive channel station.
     should be attenuated (with pad or filter) to a satisfactory         2) Adjust the Focus control of FBT for best overall focus.
     level.
  3) Picture noise caused by "broadcast noise" or weak signal.
     If the broadcast is "clean" and the RF signal is at least
     1mV (60dBu), the picture will be noise free in any area.

  Adjusting RF AGC to one end of rotation will usually cause a
  relatively poor signal to noise ratio;
  Adjusting to the other end of rotation will usually cause a
  degradation of over load capabilities resulting in color beats or
  adjacent channel interference.


Adjustment
1. Connect RF signal (60dB!1dB) and turn on the TV.
2. Press OK buttons on TV set and Remote Controller at the
   same time to get into SVC mode.
3. Press Channel UP/DOWN button on the Remote Controller
   several times to find AGC .
4. Press Volume UP/DOWN button until the AGC Voltage is
   2.5!0.1V.
5. Press OK(Y) button to memorize the data.



                                                                 - 1 -
: Deflection Data Adjustment (Line SVC-1)                             : White Balance Adjustment.(LINE SVC-0)

  NOTE: To enter SVC mode, press "OK" buttons on both TV              NOTE : This adjustment should be performed after screen
         set and the Remote control at the same time.                        voltage adjustment.

1. Preparation for Deflection Adjustment                                 1) Tune the TV set to receive an 100% white pattern.
  1) At SVC mode, press the Yellow colored button.                       2) Press OK(Y) buttons on TV set and remote controller at
     If the Remote Controller doesn't have the Yellow button,               the same time to get into SVC mode.
     you should use a Service Remote Control (105-201G) and              3) Press PSM (RED) button on remote controller. (Standard
     press SVC button.                                                      picture)
     And then, deflection data adjustment OSD (SVC1 mode)                4) Press Channel UP/DOWN button for desirous function
     will be displayed.                                                     adjustment.
  2) Press Channel UP/DOWN button for desirous function                  5) Adjust VOL+ or VOL- button for GG031.
     Adjustment.                                                         6) Adjust VOL+ or VOL-button in each status of "Rg--"/"Bg--"
  3) Press Volume UP/DOWN button to adjust the data.                        for X=282!8, Y=289!8 with color analyzer.
                                                                         7) Press OK(Y) button to memorize the adjustment data.

2. Deflection Adjustment Procedure                                     Status    Adjustment      Initial Data   25" LG     29" LG
  1) Vertical Adjustment
                                                                        RG         R-Drive           35          32           32
     Select VS and adjust until the mechanical center of CPT
     and that of screen coincides and select VA and adjust to           GG         G-Drive           31          31           31
     coincide the inner circle of screen with outer frame of CPT.
                                                                        BG         B-Drive           27          27           27
  2) Horizontal Adjustment
     Select HS and adjust until the mechanical center of CPT
     and that of screen coincides.

  3) Vertical S Correction Adjustment
     Select SC and adjust until top-bottom side pincushion are
     equal.

  4) Press OK(Y) button to memorize the data.




3. Deflection Initial Setup Data

    Status     Default       25" LG        29" LG

      VL          35            34           36

      VS          20            31           38

      VA          43            32           30

      HS          31            33           30

      SC          10            13           13

     EW           39            37           47

      EP          22            25           25

      EC          23            09           30

      ET          32            30           30




                                                                    - 2 -
: OPTION Adjustment (SVC MODE:OPTION-1,
   OPTION-2, OPTION-3)

   NOTE: When the EEPROM has been replaced, the Option data
         should be restored as the function of individual system                   OPTION Data   COMB   TILT   AV2   SCART   SYSTEM
         and specification.
                                                                                       20         0      1      0      1      00
  1) Press OK buttons on both TV set and Remote Controller at                          21         0      1      0      1      01
     the same time to get into SVC mode.                                               22         0      1      0      1      10
  2) Press the Yellow button several times to find OPTION-1,
                                                                                       23         0      1      0      1      11
     OPTION-2 or OPTION-3.
  3) Input the correspond OPTION data referring to Table below                         24         0      1      1      0      00
     with the numeric buttons 0~9.                                                     25         0      1      1      0      01
                                                                                       26         0      1      1      0      10
Table 1. OPTION 1 Function
                                                                                       27         0      1      1      0      11
  Option    Code           Function                  Remark
                                                                                       28         0      1      1      1      00
             00      BG+I+DK                  W/O RF 3.58(CF-, CZ-)
                                                                                       29         0      1      1      1      01
             01      BG+I+DK+M                with RF3.58(CT-, CD-)
 SYSTEM                                                                                30         0      1      1      1      10
             10      BG ONLY                  Single SYSTEM(CA-)
                                                                                       31         0      1      1      1      11
             11      BG ONLY+DUAL             South East Asian DUAL
                                                                                       32         1      0      0      0      00
                0    PHONO JACK (AV1)
  SCART                                                                                33         1      0      0      0      01
                1    SCART JACK (AV1)         with RGB Input
                                                                                       34         1      0      0      0      10
                0    W/O AV2 (Front)
    AV2                                       TOOL Option                              35         1      0      0      0      11
                1    with AV2 (Front)
                                                                                       36         1      0      0      1      00
                0    W/O TILT                 Basic function for Chinese
   TILT                                                                                37         1      0      0      1      01
                1    with TILT                and Australian Model
                                                                                       38         1      0      0      1      10
  COMB          0    W/O DCF
                                              Option                                   39         1      0      0      1      11
  FILTER        1    with DCF
                                                                                       40         1      0      1      0      00
                                                                                       41         1      0      1      0      01
Table 2. Specifications for OPTION-1 data                                              42         1      0      1      0      10
  OPTION Data       COMB     TILT       AV2     SCART        SYSTEM                    43         1      0      1      0      11
       0             0           0       0          0            00                    44         1      0      1      1      00
       1             0           0       0          0            01                    45         1      0      1      1      01
       2             0           0       0          0            10                    46         1      0      1      1      10
       3             0           0       0          0            11                    47         1      0      1      1      11
       4             0           0       0          1            00                    48         1      1      0      0      00
       5             0           0       0          1            01                    49         1      1      0      0      01
       6             0           0       0          1            10                    50         1      1      0      0      10
       7             0           0       0          1            11                    51         1      1      0      0      11
       8             0           0       1          0            00                    52         1      1      0      1      00
       9             0           0       1          0            01                    53         1      1      0      1      01
       10            0           0       1          0            10                    54         1      1      0      1      10
       11            0           0       1          0            11                    55         1      1      0      1      11
       12            0           0       1          1            00                    56         1      1      1      0      00
       13            0           0       1          1            01                    57         1      1      1      0      01
       14            0           0       1          1            10                    58         1      1      1      0      10
       15            0           0       1          1            11                    59         1      1      1      0      11
       16            0           1       0          0            00                    60         1      1      1      1      00
       17            0           1       0          0            01                    61         1      1      1      1      01
       18            0           1       0          0            10                    62         1      1      1      1      10
       19            0           1       0          0            11                    63         1      1      1      1      11


                                                                           - 3 -
Table 3. OPTION 2 Function                                                         OPTION Data HOTEL     EYE        CK      FFI        CHINA     LANG.

  Option   Code                 Function                   Remark                        30       0        1        1          1         1         0
           0       0       W/O FFI/CK                                                    31       0        1        1          1         1         1
           0       1       W/O FFI                                                       32       1        0        0          0         0         0
  FFI/CK
           1       0       W/O CK                                                        33       1        0        0          0         0         1
           1       1       With FFI/CK                                                   34       1        0        0          0         1         0
               0           W/O Chinese NICAM                                             35       1        0        0          0         1         1
  CHINA
               1           Chinese NICAM             Chinese Models Only                 36       1        0        0          1         0         0
               0           Multi Language                                                37       1        0        0          1         0         1
  LANG.
               1           English Only                                                  38       1        0        0          1         1         0
               0           W/O HOTEL option                                              39       1        0        0          1         1         1
  HOTEL                                              for Buyer's request
               1           for HOTEL                                                     40       1        0        1          0         0         0
               0           W/O EYE                                                       41       1        0        1          0         0         1
   EYE
               1           With EYE Function                                             42       1        0        1          0         1         0
                                                                                         43       1        0        1          0         1         1
                                                                                         44       1        0        1          1         0         0
Table 4. Specifications for OPTION-2 data
                                                                                         45       1        0        1          1         0         1
  OPTION Data HOTEL            EYE        CK   FFI       CHINA      LANG.
                                                                                         46       1        0        1          1         1         0
      0                0        0         0     0           0          0
                                                                                         47       1        0        1          1         1         1
      1                0        0         0     0           0          1
                                                                                         48       1        1        0          0         0         0
      2                0        0         0     0           1          0
                                                                                         49       1        1        0          0         0         1
      3                0        0         0     0           1          1
                                                                                         50       1        1        0          0         1         0
      4                0        0         0     1           0          0
                                                                                         51       1        1        0          0         1         1
      5                0        0         0     1           0          1
                                                                                         52       1        1        0          1         0         0
      6                0        0         0     1           1          0
                                                                                         53       1        1        0          1         0         1
      7                0        0         0     1           1          1
                                                                                         54       1        1        0          1         1         0
      8                0        0         1     0           0          0
                                                                                         55       1        1        0          1         1         1
      9                0        0         1     0           0          1
                                                                                         56       1        1        1          0         0         0
     10                0        0         1     0           1          0
                                                                                         57       1        1        1          0         0         1
     11                0        0         1     0           1          1
                                                                                         58       1        1        1          0         1         0
     12                0        0         1     1           0          0
                                                                                         59       1        1        1          0         1         1
     13                0        0         1     1           0          1
                                                                                         60       1        1        1          1         0         0
     14                0        0         1     1           1          0
                                                                                         61       1        1        1          1         0         1
     15                0        0         1     1           1          1
                                                                                         62       1        1        1          1         1         0
     16                0        1         0     0           0          0
                                                                                         63       1        1        1          1         1         1
     17                0        1         0     0           0          1
     18                0        1         0     0           1          0      Table 5. OPTION 3 Function
     19                0        1         0     0           1          1       Option Code            Function           Option
                                                                                                                                   Vol   Game INCH.
                                                                                                                          Data
     20                0        1         0     1           0          0                      0         25"
                                                                               INCH.                                       0       0         0         0
     21                0        1         0     1           0          1                      1         29"
                                                                                                                           1       0         0         1
     22                0        1         0     1           1          0                      0    W/O GAME
                                                                               GAME                                        2       0         1         0
     23                0        1         0     1           1          1                      1    With GAME
                                                                                                                           3       0         1         1
     24                0        1         1     0           0          0                      0       Standard
                                                                                   VOL                                     4       1         0         0
     25                0        1         1     0           0          1                      1   South East Asia
                                                                                                                           5       1         0         1
     26                0        1         1     0           1          0
                                                                                                                           6       1         1         0
     27                0        1         1     0           1          1
                                                                                                                           7       1         1         1
     28                0        1         1     1           0          0
     29                0        1         1     1           0          1


                                                                           - 4 -
                             PURITY & CONVERGENCE ADJUSTMENT

Caution:
Convergence and Purity have been factory aligned. Do not             5. Reconnect the internal degaussing coil.
attempt to tamper with these alignments.
However, the effects of adjacent receiver components, or             6. Position the beam bender locking rings at the 9 o'clock
replacement of picture tube or deflection yoke may require the          position and the other three pairs of tabs (2,4 and 6 pole
need to readjust purity any convergence.                                magnets) at the 12 o'clock position.




                                 DEFLECTION YOKE                                          6-POLE
                                                                                             6-POLE
                                            PURITY &CONVERGENCE                           MAGNETS
                                                                                              MAGNES              PURITY MAGNET(2-POL
                                            MAGNET ASSEMBLY


                                                        6-POLE

                                      ,,,,
                                      ,,,, ,
                                                   ,
                                                ,,,,                          4-POLE
                                                 ,,,,
                                     ,,,, ,
                                     ,,,, ,    ,,,,
                                          ,
                                      ,,,, ,
                                      ,,,, ,
                                               ,,,,
                                                ,,,,,        X-AXIS YOKE      MAGNET
                                     ,,,, ,    ,,,,
                                               ,,
                                     ,,,, ,      ,
                                                ,,,,
                                      ,, ,                   POSITIONING
                                                             (L/R PURITY)
 RUBBER
 WEDGES                                         PURITY MAGNET
                                               4-POLE
                                      GLASS CLOTH TAPE                               CONVERGENCE MAGNET ASSEMBLY
                                                                                         CONVERGENCE MAGNET ASSEMBLY




Y Purity Adjustment

This procedure DOES NOT apply to bonded yoke and picture             7. Perform the following steps, in the order given, to prepare the
tube assemblies.                                                        receiver for the purity adjustment procedure.
The instrument should be at room temperature (60 degrees F or
above) for six (6) hours and be operating at low beam current            a. Face the receiver in the "magnetic north" direction.
(dark background) for approximately 20 to 30 minutes before
performing purity adjustments.                                           b. Externally degauss the receiver screen with the television
                                                                            power turned off.
CAUTION: Do not remove any trim magnets that may be
attached to the bell of the picture tube.                                c. Turn the television on for approximately 10 seconds to
                                                                            perform internal degaussing and then turn the TV off.
1. Remove the AC power and disconnect the internal
   degaussing coil.                                                      d. Unplug the internal degaussing coil. This allows the
                                                                            thermistor to cool down while you are performing the purity
2. Remove the yoke from the neck of the picture tube.                       adjustment. DO NOT MOVE THE RECEIVER FROM ITS
                                                                            "MAGNETIC NORTH" POSITION.
3. If the yoke has the tape version beam bender, remove it and
   replace it with a adjustable type beam bender (follow the             e. Turn the receiver on and obtain a red raster by increasing
   instructions provided with the new beam bender)                          the red bias control (CW) and decreasing the bias controls
                                                                            for the remaining two colors (CCW).
4. Replace the yoke on the picture tube neck, temporarily
   remove the three (3) rubber wedges from the bell of the               f. Attach two round magnets on the picture tube screen at 3
   picture tube and then slide the yoke completely forward.                 o'clock and 9 o'clock positions, approximately one (1) inch
                                                                            from the edge of the mask (use double-sided tape).




                                                                 - 5 -
                1.ADJUST YOKE Z-AXIS FIRST                                                 2 .ADJUST BEAM BENDER 2 POLE
                TO GET EQUAL BLUE                                                          MAGNET TO GET FOUR EQUAL
                COLOR CIRCLES                                                              COLOR CIRCLES




                           MAGNETS




                              RED                                                                         RED

8. Referring to above, perform the following two steps:                 6. Reconnect the internal degaussing coil and apply AC power.
   a. Adjust the yoke Z-axis to obtain equal blue circles.
   b. Adjust the appropriate beam bender tabs to obtain correct         7. Turn the receiver on for 10 seconds to perform internal
      purity (four equal circles).                                         degaussing and then turn the receiver off again.

9. After correct purity is set, tighten the yoke clamp screw and        8. Unplug the internal degaussing-coil.
   remove the two screen magnets.
                                                                        9. Turn on the receiver, connect a signal generator to the VHF
10. Remove the AC power and rotate the receiver 180 degrees                antenna terminal and apply a crosshatch signal.
    (facing "magnetic south").
                                                                        Caution: During the convergence adjustment procedure, be
11. Reconnect the internal degaussing coil.                                      very careful not to disturb the purity adjustment tabs
                                                                                 are accidentally move, purity should be confirmed
12. Turn the receiver on for 10 seconds (make sure the receiver                  before proceeding with the convergence adjustments.
    came on) to perform internal degaussing, and then turn the
    receiver off.                                                          Note: Make sure the focus is set correctly on this instrument
                                                                           before proceeding with the following adjustment.
13. Unplug the internal degaussing coil.
                                                                        10. Converge the red and blue vertical lines to the green vertical
14. Turn on the receiver and check the purity by holding one (1)            line at the center of the screen by performing the following
    round magnet at the 3 o'clock and a second round magnet at              steps (below TABLE).
    9 o'clock position. If purity is not satisfactory, repeat steps 8       a. Carefully rotate both tabs of the 4-pole ring magnet
    through 14.                                                                 simultaneously in opposite directions from the 12 o'clock
                                                                                position to converge the red and blue vertical lines.
15. Turn off the receiver and reconnect the internal degaussing             b. Carefully rotate both tabs of the 6-pole ring magnet
    coil.                                                                       simultaneously in opposite directions form the 12 o'clock
                                                                                position to converge the red and blue (now purple)
                                                                                vertical lines with the green vertical line.
Y Convergence Adjustment
                                                                        11. Converge the red and blue horizontal with the green line at
Caution: This procedure DOES NOT apply to bonded yoke and                   the center of the screen by performing the following steps.
         picture tube assemblies.                                           (below TABLE)
         Do not use screen magnets during this adjustment                   a. Carefully rotate both tabs of the 4-pole ring magnet
         procedure. Use of screen magnets will cause an                         simultaneously in the same direction (keep the spacing
         incorrect display.                                                     between the two tabs the same) to converge the red and
                                                                                blue horizontal lines.
1. Remove AC power and disconnect the internal degaussing                   b. Carefully rotate both tabs of the 6-pole ring magnet
   coil.                                                                        simultaneously in same direction (keep the spacing
                                                                                between the two tabs the same) to converge the red and
2. Apply AC Power and set the brightness to the Picture Reset                   blue (now purple) horizontal lines with the green
   condition. Set the Color control to minimum.                                 horizontal line.
                                                                            c. Secure the tabs previsouly adjusted by locking them in
3. Make horizontal line.                                                        place with the locking tabs on the beam bender.

4. Adjust the Red, Green and Blue Bias controls to get a dim
   white line.

5. Restore the screen by removing the horizontal line.



                                                                   - 6 -
                               RING           ROTATION DIRECTION                           MOVEMENT OF RED
                               PAIRS            OF BOTH TABS                                AND BLUE BEAMS



                                                                                              B              B
                                                               OPPOSITE                            OR
                                                                                              R              R
                                 4
                               POLE

                                                                  SAME                B       R        OR    B      R




                                                                                             B               B
                                                               OPPOSITE                                OR
                                                                                             R               R
                                 6
                               POLE

                                                                  SAME                B      R         OR    B      R




                 UP/DOWN ROCKING OF THE YOKE                                         LEFT/RIGHT ROCKING OF THE YOKE
                  UP/DOWN ROCKING OF THE YOKE
                 CAUSES OPPOSITE ROTATION OF RED                                     CAUSES OPPOSITE SIZE CHANGE YOKE
                                                                                      LEET/RIGHT ROCKING OF THE OF THE
                 AND BLUE RASTERS ROTATION OF RED
                  CAUSES OPPOSITE                                                    RED AND BLUE RASTERS CHANGE OF
                                                                                      CAUSES OPPOSITE SIZE
                  AND BLUE RASTERS                                                    THE RED AND BLUE RASTERS

                                      GREEN



                                                                                                                                     GREEN
                  ADJUSTMENT
                    VIEWING                                                               ADJUSTMENT                     RED
                     AREA        BLUE     RED                                               VIEWING
                                                                                             AREA
                                                                                                                                     RED

     GREEN                RED                      BLUE

                          BLUE                     RED
                                                                      GREEN



                                  RED      BLUE


                                                                                                                                     TV
                                                                                                                                     SCREEN

                                      GREEN


12. While watching the 6 o'clock positions on the screen, rock the             17. Temporarily place a rubber wedge at the 5 o'clock and 7
    front of the yoke in a vertical (up/down) direction to converge                o'clock positions to hold the horizontal position of the yoke.
    the red and blue vertical lines. (Fig upper left)                          18. Check the 3 o'clock and 9 o'clock areas to confirm that the
13. Temporarily place a rubber wedge at the 12 o'clock position                    red and blue vertical lines are converged. If the lines are not
    to hold the vertical position or the yoke.                                     converged, slightly offset the horizontal tilt of the yoke (move
14. Check the 3 o'clock and 9 o'clock areas to confirm that the red                the temporary rubber wedges if necessary) to equally
    and blue horizontal lines are converged.                                       balance the convergence error of the horizontal lines at 6
    If the lines are not converged, slightly offset the vertical tilt of the       o'clock and 12 o'clock and the vertical lines at 3 o'clock and 9
    yoke (move the rubber wedge if necessary) to equally balance the               o'clock.
    convergence error of the horizontal lines at 3 o'clock and 9 o'clock       19. Using a round magnet confirm purity at the center, right and
    and the vertical lines at 6 o'clock and 12 o'clock.                            left sides and corners. See Purity Adjustment Procedure.
15. Place a 1.5 inch piece of glass tape over the rubber foot at               20. Reconfirm convergence and apply a 1.5 inch piece of glass
    the rear of the 12 o'clock wedge.                                              tape over the rubber foot at the rear of the 5 o'clock and the 7
16. While watching the 6 o'clock and 12 o'clock areas of the                       o'clock wedges.
    screen, rock the front of the yoke in the horizontal (left to
    right) motion to converge the red and blue horizontal lines.
    (Fig. upper right)


                                                                          - 7 -
   NO RASTER
                                              CHECK +B
                                           at D807 cathode
                             Normal                           Abnormal


                                                                    Check           Open
                 Is the voltage at pin37
                   & 12 of IC512 8V?                             FUSE of AC line
                                                     No
                                                                                     Check /replace
                                                                          OK        Fuse,D801,IC801
                              Yes          Check the in/out
                                           of IC841,IC842                           D810,D811,D812
                                                                Check the voltage
                     Check pin40
   No                                                               of C806
                    of IC512(H-out)                                                          0V
                                                     No
Check &replace                                                                       Check /replace
                              Yes                                        254~380V
    IC512                                                                           Fuse,D801,IC801
                                           Check u-COM
                       Check Q402           pin20 low?                              D810,D811,D812
                                                                Check the voltage
   No              collector waveform
                                                                 of pin4, IC803.
Check &replace                                       No
                              Yes
    IC512
                                           Check /replace
                      Check T451               Q802
                   & each pin voltage                            Check /replace
   No                                                             D806,IC803
                                                                  R807,R815
Check &replace                Yes
    IC512
                 Is the voltage at pin37
                    & 12 of IC512 8V?
NO SOUND / PICTURE OK


          AV STEREO MODEL                                        NICAM STEREO MODEL


    Select correct                                        Select correct
   system in MENU                                        system in MENU

              OK                                                    OK
                         NOT OK                                                     NOT OK
 Check the waveform                                    Check the waveform
   of PIN4, HIC3                                       of PIN 7,8 P611A

              OK                    Check / replace                 OK                    Check Vcc / replace
                                        HIC3                                               NICAM BOARD
 Check demodulated                                     Check demodulated
signal of pin15, IC512                                 of input pin of IC601
                         NOT OK
              OK                                                    OK
                                    Check / replace
                                        IC512
 Check demodulated                                        Check the Vcc
 of input pin of IC601                                      of IC601

              OK         NOT OK
                                  Check the waveform
                                                                                        ChecK / replace
                                   of PIN 7,8 & Vcc
    Check the Vcc                                                                           IC601
                                      AV BOARD
      of IC601
                                                                               NOT OK
NO RASTER / SOUND OK



                                              Check the
                                         Heater voltage of CPT
                                            (6  6.5Vrms)

                                         OK                                      Not OK


              Check                    Check                                  Check the
       HV, Screen voltage of        Ik Current of                         Heater pulse of FBT
               CPT                  IC512, pin18                                 T406

      Not OK                   OK                   Not OK           OK                         Not OK


                       Check/Replace                                 Check
                                                                                           Check
                        CPT Board                                    FR901
                                                                                          FBT T406
                        Components                               P902A & P902B




                                               Check
      Check
                                            IC512, ZD904
     FBT T406
                                           P901A & P901B
NO PICTURE / NO SONUD
                                              Is any OSD displayed?

                  No
                                                          Yes
   OK   Check IC01 pin30,31,32            Check receiving system in MENU
               (R,G,B)                        & excute Auto-program.
                    Not OK
         Check IC01 pin9,10                   Does the Auto-program        Yes
          (V-Sync, H-Sync)                      operate properly.
         Check IC01 pin36,37
            (XLC, EXLC)                                   Not OK
               & IC01
                                          Store in manual-program MENU

                Check            Not OK    Check 5V, 33V & IIC Bus Line
               5V, 33V &                            of TUNER
             IIC Bus Line
                                                          OK
                                                                                    Go to
                                 Not OK       Is the CVBS signal OK.
           Check / Replace                                                       NO SOUND /
                                                   ( IC512 pin6 )
           TUNER, IC512                                                          PICTURE OK
                                                          OK
               Check             Not OK
                                                Check R,G,B signal
           CVBS singal Line                    at IC512 pin19,20,21
              & IC512
                                                          OK
                                                Check / Replace
                                              CPT Board component
NO TELETEXT




                             Check the
                       voltage of IC701 pin19


           OK                                            0V


        Check                                     Check 5V Supply
    CVBS signal                                    Line of IC701
    at IC701 pin9                                     & P701


                                                           OK

                                            OK        Check
                                                 IC701& IICBus Line

  Not OK

   Check / Replace
 Q701, X701, & IC501
                                                                                                                                                                                              SPEAKER
                                                                                                                                                                 EAR PHONE
                                                                                                                 REAL STEREO R            24
                                                                          SAW             SIF
                                                              IF         FILTER         DA4445B
                                                                                                    12      47    A2& NICAM L             25
                                                                                                                                                    5 R
                                                                                                                                                                        R
                                                                                                                                                                        R
                                                                                                                                                                                               R    >>
  OPTION PART                                 AV2                                                                 MSP3410D                            R   SOUND AMP.
                                               AV2                                                                                                          LA4282
   I2C LINE                                 (FRONT)
                                             (FRONT)                                                                                                2   L            L
                                                                                                                                                                     L
                                                                                                                                                                    (MONO)
                                                                                                                                                                      MONO
                                                                                                                                                                                                     <<
                                                                                                                                                                                                L

  LOCAL KEY PRE AMP                                                                                                                   R 31
   LOCAL KEY PRE AMP                                  E2PROM                           AV1                         AV STEREO
                                                                                                                    TDA7429S          L 32
                                    OSD
                                                                                       AV2
                MICOM               RGB
                                                                   TILT                                                                            RGB
                       Game sound                                                                                                                              RGB AMP.
                                                                                                         HICTILT
                                                                                                                                                               TDA6108Q

         TELETEXT                                                                                                                                              VER. AMP.               V-DY
                                                                              SIF TRAP               SIF
          SAA5281                                                          5.5/6.0/6.5' 4.5        FILTER                                                      TDA8350Q
                RGB    CVBS                                                                          5.5                   SIF SEL.

                                                                                                                  HIC                                      H.D.Tr                       H-DY
                            9                                                                        6.0                   CD4052B
                                                                                                     6.5
                                                                                                     4.5                  SIF                            HDT
                                Video-out              AV1 AV2 V-IN FSC                                                                                                        C
   EXT RGB
(from SCART)
                                                           DIGITAL
                                                                                                                                          SO.S1                              200V
                                                        COMB FILTER                                                                                                                    FBT
                                                                                                                                                                               46V
                                                                                                                                          CO.C1
                        38              15       13            17         11    10        6    1    2                                                                            17V
                                                                                                                          3
              RGB-in    CVBS-o          AF RGB-o V-in          AV1 AV2/Y C              V-o SIF AUDIO
                                                                                                              TV         AUDIO SW
                                                                                                    A-o 55           1                                                                  B+
                                                      IF-IN        AGC         H-out    VA,B                              CD4052B
         VCD 1CHIP TDA8844
                                                  48     49         54          40                                        5           2
                                                                                                                                                           AUDIO B+                 130V
                                                                                                                                                                             32V
                                     PRE-AMP
                                                                                                                    AV1         AV2
                                                   SAW                                                                                                                       13V


                TUNER
                       IF
                                     HIC          FILTER
                                                                                         EXT RGB             V1                EXT
                                                                                                                              AUDIO            MICOM
                                                                                                                                                        5V REG
                                                                                                                                                                               SMPS
                                                                                                                                                                             STR-F6654
                                                 4.5 OTHERS                              (SCART)                                                                                               AC INPUT
                      AGC                                                                                AV1                                                                                   100 INPUT
                                                                                                                                                                                                 AC 270V
                                                                                                          AV1                                           8V REG               12V                100 270V
 RF SIGNAL                                                                                         (SCART or PHONE)
                                                                                                    (SCART or PHONE)
Service Sheet of MC-8CB   P/No : 3854VA0050A-S1
                          DATE : 1999.06.07




                                Video
                                Chroma
                                Audio
P/No : 3854VA0050A-S2
DATE : 1999.06.07



◦ Jabse Service Manual Search 2024 ◦ Jabse PravopisonTap.bg ◦ Other service manual resources online : FixyaeServiceinfo