LG 50PC51 User manual

PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : PP78A
MODEL : 50PC51 50PC51-ZB
website:http://biz.LGservice.com

- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ..........................................................................3
SPECIFICATION ........................................................................................4
ADJUSTMENT INSTRUCTION .................................................................6
TROUBLE SHOOTING ............................................................................15
BLOCK DIAGRAM...................................................................................23
EXPLODED VIEW .................................................................................. 24
EXPLODED VIEW PARTS LIST ............................................................ 25
REPLACEMENT PARTS LIST ............................................................... 26
SVC. SHEET ...............................................................................................
PRINTED CIRCUIT DIAGRAM ....................................................................

- 3 -
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this monitor is blown, replace it
with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to high vacuum and large surface area of picture tube,
extreme care should be used in handling the Picture Tube.
Do not lift the Picture tube by it's Neck.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩand 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF

- 4 -
SPECIFICATIONS
NOTE : Specifications and others are subject to change without notice for improvement .
VApplication Range
This spec is applied to the 50” PLASMA TV used PP78A Chassis.
V Specification
Each part is tested as below without special appointment.
1) Temperature : 25±5°C (77±9°F), CST : 40±5
2) Relative Humidity: 65±10%
3) Power Voltage: Standard Input voltage (100-240V~, 50/60Hz)
* Standard Voltage of each product is marked by models.
4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with SBOM.
5) The receiver must be operated for about 20 minutes prior to the adjustment.
VTest Method
1) Performance : LGE TV test method followed.
2) Demanded other specification
Safety : CE, IEC specification
EMC : CE, IEC
VGeneral Specification ( 50”XGA )
Chassis
PP78A 50PC51-ZB EU LG
Model Name Market Brand Remark
50PC51-ZB Safety : IEC/EN60065, EMI : EN55013, EMS : EN55020EU
Model ApplianceMarket
TEST
Remark
Display Screen Device
Aspect Ratio
PDP Module
Operating Environment
Storage Environment
Input Voltage
1
2
3
4
5
6
No Item Specification Remark
50” Wide Color Display Module
16:9
PDP50X4,
RGB Closed Type
1)Temp. : 0~40deg
2)Humidity : 0~85%
3)Temp. : -20~60deg
4)Humidity : 0~85%
100-240V~, 50/60Hz
Plasma Display Panel
Clear Filter
LGE SPEC.
Maker : Sanken

- 5 -
VModule Specification2
Market
Broadcasting system
Available Channel
Receiving system
SCART Jack(2EA)
Video Input (1EA)
S-Video Input (1EA)
Component Input (1EA)
RGB Input(1EA)
HDMI Input(1EA)
Audio Input (5EA)
Audio variable out(1EA)
1
2
3
4
5
6
7
8
9
10
11
12
No Item Specification Remark
EU
PAL-BG/I/DK, NTSC, SECAM
BAND PAL
VHF/UHF C1~C69
CATV S1~S47
Upper Heterodyne
PAL, SECAM, NTSC
PAL, SECAM, NTSC
PAL, SECAM, NTSC
Y/Cb/Cr, Y/Pb/Pr
RGB-PC
HDMI-DTV
PC Audio, Component(1EA),
AV (2EA), SIDE AV(1EA)
FULL SCART, HALF SCART
SIDE AV
SIDE S-VIDEO
L/R Input
VModule Specification (PDP50X4)
Display area
Outline dimension
Number of Pixels
Cell pitch
Color arrangement
Weight(net)
Temperature
Operating Environment Humidity
Pressure
Temperature
Storage Environment Humidity
Pressure
Image stick Start time
minimization Low Brightness Arrival Time
mode
1106.5 (H) * 662.1(V)±0.5
1190 (W) x 700 (H) x 52 (D)±1
1366 (H) x 768(V)
270um (H) x 810um (V)
RGB closed type
13.8 14.3 14.8
0 ~ 40
20 ~ 80
800 ~ 1100
-20 ~ 60
10 ~ 90
700 ~ 1100
4.5 5 5.5
14 16 16
1
2
3
4
5
6
7
8
9
No Item Remark
1Pixel=3RGB Cells
1Pixel=3RGB Cells
Altitude : 0 to 2000M
Altitude : 0 to 3000M
mm
mm
um
Kg
deg
%
hPa
deg
%
hPa
min
min
Min Typ Max Unit

- 6 -
ADJUSTMENT INSTRUCTION
1. Application Object
These instructions are applied to all of the 50” PLASMA TV,
PP78A Chassis.
2. Note
(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolation
transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
(4) The input voltage of the receiver must keep 100-220V~,
50/60Hz.
(5) Before adjustment, execute Heat Run for 30 minutes.
3. Adjustment items
3.1. PCB assembly adjustment items
(1) Download the VCTP main software (IC500,VCT_Pro)
(2) Channel memory (IC501,EEPROM)
(3) Color carrier Adjustment
3.2. SET assembly adjustment items
(1) DDC Data input.
(2) Adjustment of White Balance.
(3) Factoring Option Data input.
4. PCB assembly adjustment method
(Using VCTP Download program)
4-1. Download program installation
(1) Extract a Zip file.
(2) Visual I2C & LPT Driver Installation.
LPT Port Driver (LptDrv) Setups : Program Files > Micronas >
Visual I2C > Port_Driver
*Use for Windows 95/98 : Setup_LptDrv_v0104_9x.exe
*Use for Windows 2000/XP : Setup_LptDrv_v0202_XP_2000.exe
* Use for Windows NT : Setup_LptDrv_v0104_NT.exe
(3) Verification.(Start > Programs > Micronas > Visual I2C or
LptDrv)
(4) LPT delay setting.(File > Preference > LPT preferences)
(5) Exchange the “bootloader.bat” file.
Click the red area
Double click the Red
Install the LPT Driver
Install the Visual I2C
*LPT SETTING
- Delay => 1
- Time out => 500 ms

- 7 -
=> Select the "Bootloader.bat" file.
(install > VCTP_download > Bootloader)
=> Push "OK".
=>
Finish the program, after saving the file "download_cs.vi2c".
(if you click , the massage appears automatically)
5. S/W program download
5-1. Profile
: This is for downloading the s/w to the flash memory of the
vctp(IC500)
5-2. Required Test Equipment
(1) PC.
(2) Visual IIC program.
(3) Download jig.
5-3. Connection structure
6. Download method
6-1. Download method 1 (PCB Ass’y)
(1) Connect the download jig to D-sub jack.
(2) Execute ‘Download.vi2c’program in PC, then a main
window will be opened.
(3)
Double click the blue box and confirm "Bootloader Version" as 42.
(4) Click the "Erase Flash" button.
(5) Double click the download file low, then "edit" window will
be opened.
(6) Click the choice button in the “edit window”, then “file
choice window”will be opened.
(7) Choose the Hex file in folder and execute downloading
with click " open" button.
x
You must verify the words of “0xfffff”in the black box of figure.
(In case of H3 Service it is 0x7ffff : If you make H4 service after
the H3 service, there could be some problem)

- 8 -
(8) Click OK button at the "edit window".
(9) Under Downloading process.
(10) If download is failed, for example "No acknowledge from
slave". Execute download again from(1).
6-2.Download method 2 (AV Plate Ass’y)
(1) Push S/W ‘ON" (connect SCL to GND using switch at Jig )
and connect the download jig to D-sub jack.
(2) Supply the power (Stand-by 5V) and wait for 3 seconds.
(3)
Push the S/W off.(Disconnect SCL to GND using switch at jig).
(4) Execute ‘Download.vi2c’program in PC, then a main
widow will be opened.
(5)
Double click the blue box and confirm "Bootloader Version" as 42
.
(6) Click the "Erase Flash" button.
(7) Double click the download file low then, "edit" window will
be opened.
(8) Chick the choice button I n the "edit window", then "file
choice window’will be opened.
(9) Click the “load > flash”button.
(10) Choose the Hex file in folder and execute downloading
with click "open button".
Push S/W
Push S/W
A
You must verify the words of “0xfffff”in the black box(A) of figure.
(In case of H3 Service it is 0x7ffff : If you make H4 service after
the H3 service, there could be some problem)

- 9 -
(11) Click OK button at the "edit window".
(12) Under Downloading progress.
(13) If download is failed, for example "No acknowledge from
slave", execute download again from (1).
6-3.Download method 3 (SET)
(1) Push the “Tilt”button in an Adjust Remocon Then the
PLASMA TV will change a “slave mode”.
(2) Connect Zig to TV using a D-sub cable.
(3) Execute ‘Download_CS.vi2c’program in PC, then a main
widow will be opened.
(4) Click "GO" button.
If you don’t push the “go”, the Hex file would not be
downloaded although the download proceeds normally at
first glance.
(5) Double click the blue box and confirm "Bootloader
Version" as 42.
(6) Click the "Erase Flash" button.
(7) Double click the download file low then, "edit" window will
be opened.
(8) Chick the choice button I n the "edit window", then "file
choice window’will be opened.
(9) Click the “load > flash”button.
A
You must verify the words of “0xfffff”in the black box(A) of figure.
(In case of H3 Service it is 0x7ffff : If you make H4 service after
the H3 service, there could be some problem)

- 10 -
(10) Choose the Hex file in folder and execute downloading
with click "open button".
(11) Click OK button at the "edit window".
(12) Under Downloading progress.
(13) If download is failed, for example "No acknowledge from
slave", execute download again from (1).
7. Channel memory download
7-1. Profile
: This is for downloading the s/w to the flash memory of the
vctp(IC500)
7-2. Required Test Equipment
(1) PC.
(2) Visual IIC program.
(3) Download jig.
7-3. Connection structure
(1) Connect the download jig to D-sub jack.
(2) Execute ‘Channel.vi2c’program in PC, then a main
window will be opened.
7-4. Connection condition
(1) IC name and circuit number : VCTP and IC500.
(2) Use voltage : 3.3V.
(3) SCL : 15pin.
(4) SDA : 12pin.
(5) Tact time : about 3seconds.
7-5. Download method
(1) Connect the download jig to D-sub jack.
(2) ‘Execute ‘Channal vi2c’program in PC, then a main
window will be opened.
(3) Push the button change and select the Channel memory
data.
(4) Check the communication is OK or not.
=> Push the Read area (Ackn. Check) and check Cyan area
is OK message.
(5) Push the Update NVM from File

- 11 -
8. Tool Option Area Option Change
8-1. Profile
: Must be changed the option value because being different with
some setting value depend on module, inch and market.
8-2. Required Test Equipment
1) Adjustment remocon.
8-3. Adjustment method
Before PCB check, have to change the Tool option and Area option.
Option values are below.
(If on changed the option, the input menu can differ the model spec.)
The input methods are same as other chassises.(Use adj Key
on the Adjust Remocon)
* After done all adjustments, Press ADJ button and compare
Tool option and Area option value with its BOM, if it is
correctly same then unplug the AC cable.
If it is not same, then correct it same with BOM and unplug AC cable.
For correct it to the model’s module from factory JIG model.
9. Color carrier Adjustment
(Inspection process)
9-1. Profile
: To have the margin about the deviation of colorcarrier to
satisfy the spec.
9-2. Required Test Equipment
1) Adjustment remocon.
2) Pal RF signal.
9-3. Connection
: TV set should connected with the pal RF signal(EU 5CH).
9-4. Adjustment method
(1) tuning the RF signal
ZA/ZB, TA/TB : PAL Philips Pattern (with Color Bar)
(2) push the “adj”key in the adjustment remocon.
10. POWER PCB Assy Voltage
Adjustments (Va, Vs Voltage adjustments)
10-1. Profile
: To supply the Va, Vs voltage that the module want.
10-2. Required Test Equipment
(1) Stick for adjustment.
(2) DMM.
10-3. Connection structure
10-4. Connection Diagram for Measuring
: refer to (Fig. 1)
10-5. Adjustment Method
(1) Va Adjustment
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D. M..M. to Va pin of P812, connect
-terminal to GND pin of P812.
3)
After turning VR901,voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(deviation;
± 0.5V)
(2) Vs Adjustment
1) Connect + terminal of D. M..M. to Vs pin of P812, connect
-terminal to GND pin of P812.
2) After turning VR951, voltage of D.M.M adjustment as
same as Vs voltage which on label of panel right/top.
(deviation ; ±0.5V)
Each PCB assembly must be checked by check JIG set.
(Because power PCB Assembly damages to PDP Module,
especially be careful)
50
PC5R
PC6R
PC7R
PB3R
TOOL OPTION ZA/ZB TA/TB
2260
2516
2772
3028
4308
4564
4820
5076
(Fig. 1) Connection Diagram of power adjustment for measuring.

11. EDID(The Extended Display Identification Data )
/DDC(Display Data Channel) download
11-1. Profile
: To be possible for plug and play.
11-2. Required Test Equipment
(1) Adjusting PC with S/W for writing EDID Data.
(S/W : EDID TESTER Ver.2.5)
(2) A Jig for EDID Download.
(3) Cable : Serial(9Pin or USB) to D-sub 15Pin cable, D-sub
15Pin cable, DVI to HDMI cable.
11-3. Connection structure
* Caution
- Never connect HDMI & D-SUB Cable at the same time.
- Use the proper cables below for EDID Writing.
11-4. Preparation for Adjustment
(1) As above (Fig. 2), Connect the Set, EDID Download Jig,
PC & Cable.
(2) Turn on the PC & EDID Download Jig. And Execute the
S/W : EDID TESTER Ver 2.5.
(3) Set up S/W option.
Repeat Number : 5
Device Address : A0
PageByte : 8
(4) Power on the Set.
11-5. Sequence of Adjustment
(1) DDC data of Analog-RGB
1) Init the data.
2) Load the EDID data.(Open File).
[ Analog
- RGB : PP78A_RGB.ANA ]
[ Digital-HDMI1 : PP78A_HDMI1.DVI ]
[ Digital-HDMI2 : PP78A_HDMI2.DVI ]
3) Set the S/W as below.
(4) Push the “Write Data & Verify”button. And confirm “Yes”.
(5) If the writing is finished, you will see the “OK”message.
- 12 -
For RGB EDID For HDMI EDID
(Fig. 2) Connection Diagram of DDC download
Open FileOpen File

- 13 -
11-6. EDID Data
(1) XGA
<Analog (RGB) >
< Digital1 (HDMI/DVI1) >
< Digital2 (HDMI/DVI2) >
=> Detail EDID Options are below(1,2,3,4,5)
1. Product ID
2. Serial No : Controlled on production line
3. Month, Year : Controlled on production line
ex) Monthly: '03' => '03'
Year: '2005' => '0F'
4. Model Name : model name -> LG TV
- LG TV
5. Checksum (7EH) -> Changeable by total EDID data.
12. Adjustment of White Balance
12-1. Purpose and Principle for adjustment
of the color temperature
(1) Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
(2) Principle : To adjust the white balance without the
saturation, Fix the one of R/G/B gain to 80 and decrease
the others.
12-2.Adjustment mode
: Two modes of Cool and Warm.(Medium data is
automatically calibrated by the cool data)
12-3. Required Equipment
(1) Remote control for adjustment.
(2) Color Analyzer.(CA-110 or same product) - CH : 10
(3) Auto W/B adjustment instrument.(only for Auto adjustment)
12-4. Connecting diagram of equipment for
measuring (For Automatic Adjustment)
(1) Enter the DDC adjust mode.
- Enter the white balance adjustment mode at the same
time heat-run mode when pushing the power on by power
only key.
- Maintain the white balance adjustment mode with same
condition of Heat-run.
->
Maintain after AC off/on in status of Heat-run pattern display.
(2) Release the DDC adjust mode.
- Release the adjust mode after AC off/on or std-by off/on
in status of finishing the Hear-run mode.
- Release the Adjust mode when receiving the aging off
command(F3 00 00) from adjustment equipment.
- Need to transmit the aging off command to TV set after
finishing the adjustment.
* Standard color coordinate and temperature when using the
CA-110 or CA210 equipment.
* Synchronization relation between PSM and CSM.
Model
Name
50PC5R
(50PC51)
DEC
50007 (A)
50008 (D)
Product ID
HEX
C357
C358
EDID table
57C3
58C3 Color Coordinate
xy
0.283±0.002
0.293±0.002
0.329±0.00
2
11,000K
9,300K
6,500K
0.000
0.000
0.003
0.276±0.002
0.285±0.002
0.313±0.00
2
COOL
MEDIUM
WARM
Mode Temp uv
CSM Remark
Cool
Normal
Warm
Dynamic
Standard
Mild
PSM
12
3
4
4 5
1 2
3
4
4
5
5
12
3
4
4
5
5

- 14 -
(3) DDC adjustment support command set.
* R/G/B GAIN max value : 80
12-5. Adjustment of White Balance
(For Manual adjustment)
- Adjustment mode : Two modes of Cool (Dynamic) and
Warm(Mild).
(Medium data is automatically calibrated by the cool data)
- Color analyzer(CA110, CA210) should be used in the
calibrated ch by CS-1000.(PDP : CH10)
- Operate the zero-calibration of the CA-110 or CA-210, then
stick sensor to the module when adjusting.
- For manual adjustment, it is also possible by the following
sequence.
(1) Select RF no signal by pressing “POWER ON” key on
remote control for adjustment then operate heat run more
than 15 minutes.
(If not executed this step, the condition for W/B will be differ.)
(2) Changing to the av mode by pushing the input or front av
key.(av mode : av1 or av2 or av3)
(3) Display the internal pattern of the VCT-Pro IC by pushing
the IN-START.
(4) Stick sensor to center of the screen and select each items
(Red/Green/Blue Gain and Offset) using D/E (CH+/-) key
on R/C.
(5) Adjust R Gain / B Gain using F/G(VOL+/-) key on R/C.
(6) Adjust two modes of Cool(Dynamic) and Warm(Mild) as
below figure.
(Fix the one of R/G/B and change the others)
1. Push the one time the in-start key : Dynamic(Cool)
2. Push the two more the in-start key : Mild(Warm)
* Refer to the below case to know what value is fixed.
* CASE
- First adjust the coordinate much away from the target
value(x, y).
1) x, y > target
(1) Decrease the R, G.
2) x, y < target
(1) First decrease the B gain.
(2) Decrease the one of the others.
- In case of decreasing the x, decreasing the R : fix G
- In case of decreasing the y , decreasing the G : fix R
3) x > target , y < target
(1) First decrease B, so make y a little more than the
target.
(2) Adjust x value by decreasing the R.
4) x < target , y > target
(1) First decrease B, so make x a little more than the
target.
(2) Adjust x value by decreasing the G.
(7) When adjustment is completed, Exit adjustment mode
using EXIT key on R/C.
13. Input the Shipping Option Data
(1) Push the ADJ key in a Adjust Remote control.
(2) Input the Option Number that was specified in the BOM,
into the Shipping area.
(3) The work is finished, Push AKey.
14. Default Value in Adjustment mode
(Default values maybe modified the module condition)
14-1. White Balance
15. Internal press test
16. Sound spec.
Adjustment
Aging On/Off
Input select
R GAIN
G GAIN
B GAIN
R GAIN
G GAIN
B GAIN
R GAIN
G GAIN
B GAIN
CMD(HEX)
F3
F4
16
18
1A
16
18
1A
16
18
1A
ADR
00
00
00
01
02
VALUE
FF/00
00 - FE
00 - FE
00 - FE
00 - FE
00 - FE
00 - FE
00 - FE
00 - FE
00 - FE
Detail
OO : OFF
01 : ON
FF : WB Ready
0x10 : TV
0x20 : AV1
0x21 : AV2
0x23 : AV3
0x40 : Component1
0x50 : RGB DTV
0x60 : RGB PC
0x90 : HDMI1 DTV
GAIN adjustment
CSM COOL
GAIN adjustment
CSM NORMAL
GAIN adjustment
CSM WARM
Color Coordinate
xy
0.283±0.002
0.293±0.002
0.329±0.00
2
11,000K
9,300K
6,500K
0.000
0.000
0.003
0.276±0.002
0.285±0.002
0.313±0.00
2
COOL
MEDIUM
WARM
Mode Temp uv
Item
Dielectric Voltage (AC <-> FG)
Dielectric Voltage (Without FG)
Value
1.5
1.5
3
3
Unit
kV
kV
Remark
At 100mA for 1sec (Line)
At 100mA for 1min (OQC)
At 100mA for 1sec (Line)
At 100mA for 1min (OQC)
Item Min Typ Max Unit Remark
Audio Practical Max Output, L(Mono)/R 9 10 12 W PDP
<Default Value on OSD>

- 15 -
TROUBLESHOOTING
1. No power
(1) Symptom
1) Minute discharge does not occur at module.
2) Front LED does not activate.
(2) Press check
Plug in the power cord
Start Check
No
Yes
Is the power cord
plugged in?
Connect the cable.
Plasma(CN1)
No
Yes
Are the line filter and
PSU connected?
Replace the fuse.
No
Yes
Is the correct fuse for
the PSU in place?
Plasma(F101)
Connect the 13-14pin cable.
Next remove all cables connected to the PSU and
switch the AV voltage to manual.
If the ST-by 5V does not operate, replace the PSU.
No
Yes
Is the PSU and 13-
14pin cable connected
to the VSC board?

- 16 -
2. Protect mode
(1) Symptom
1) After lighting once it does not discharge minutely from the module.
2) The relay falls.(there is an audible “Click”.)
3) The color of the front LED turns from green to red.
(2) Follow check
Is the Power Board
normal ?
Replace Power Board.
Is the output the normal Low/High
voltage except for the Stand-by 5V?
Yes
No No
Are all the connectors
normal?
Replace the connector.
Replace the fuse.
Replace the Y-Board.
After checking each connector does
is operate correctly?
Yes
No No
Is the Y-Board
normal?
Is the appropriate
fuse (FS2,FS3) on the
Y-B/D?
Is the output voltage
normal after removing the
P1 connector of the Y-B/D?
Yes
No No
Replace the Z-Board.
Is the Z-Board
normal?
Is appropriate
fuse (FS1,FS2) on
the Z-B/D?
Is the output voltage
normal after removing the
P1 connector of the Z-B/D?
Yes
No No
Is the X- Board
normal?
Is the
output voltage normal
after removing the P100, 110,
200, 210 connector of
the X-B/D?
After removing the P100, 110 and the output
voltage is normal : Replace the Right X-B/D
After removing the P200, 210 and the output
voltage is normal : Replace the Left X-B/D
No
Yes
Replace the fuse.
Yes
Start Check

- 17 -
3. No Raster
(1) Symptom
1) No OSD or image are displayed on the screen.
2) The front LED remains green.
(2) Follow check
4. In the case an unusual display in RF mode.
Check the PDP Module
Replace the
Power board.
Does
minute discharge
at Module?
Is the inverter
/VaVs on?
Is output the normal
Low/High voltage except
for the Stand-by 5V?
Yes
No No
Is there a fault with
the link cable?
Yes
Is the output for the
IC500 normal?
Reconnect the link cable in
P803(Plasma).
No
Replace the VSC.
No
Yes
Check the power.(L1103)
Is the
video output of the
Tuner normal? (Check
TU400_Pin13)
Is the
input voltage
normal?(Check
Pin3)
Is the I2C communication normal?
(Check Pin9, Pin10)
Yes
No Yes
Is the LVDS
Cable connected?
Yes
Change the IC(IC500)
Re-insert the cable.
No
No
Check the Tuner.
No
A
Start Check

- 18 -
5. In the case of an unusual display in rear AV mode.
Is video input of
the A/V jack normal?
(Check R172)
Yes
Sam as Block A
Check the input source.
No
6. In the case of an unusual display in Side AV mode.
Is the video input
of the A/V jack normal?
(Check CN703
Pin9)
Yes
Sam as Block A
Check the input source.
No
7. In the case of an unusual display in Side S-Video mode.
Is the video input
of the A/V jack normal?
(Check CN703 Pin1,
Pin3)
Yes
Sam as Block A
Check the input source.
No

- 19 -
8. In the case of an unusual display in SCART 1 mode.
Is the video input
of the A/V jack normal?
(Check R172)
Yes
Sam as Block A
Check the input source.
No
9. In the case of an unusual display in SCART 1_RGB mode.
Is the
video input of
the A/V jack normal?(Check
R110,R170, R171,
R173)
Yes
Sam as Block A
Check the input source.
No
10. In the case of an unusual display in SCART 2 mode.
Is the video input of
the A/V jack normal?
(Check R174)
Yes
Sam as Block A
Check the input source.
No

- 20 -
11. In the case of an unusual display in component 1 mode.
Is the video
input of the A/V jack
normal? (Check R248,
R249,R250)
Yes
Change the IC(IC500)
Check the input source.
No
12. In the case of an unusual display in component 2 mode.
Yes
Change the IC(IC500)
Check the input source.
No
Is the video
input of the A/V Jk202
normal? (Check R241,
R242, R243)
13. In the case of an unusual display in RGB mode.
Yes
Change the IC(IC500)
Check the input source.
No
Is the
R, G, B input
and H, V sync of the
JK201 normal?(Check R220,
R221, R253, R254,
R255)