LG 50PG3000 User manual

PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : PD83A
MODEL : 50PG3000 50PG3000-ZA
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only

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Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ..........................................................................3
SPECIFICATION........................................................................................4
ADJUSTMENT INSTRUCTION .................................................................6
TROUBLE SHOOTING............................................................................15
BLOCK DIAGRAM...................................................................................24
EXPLODED VIEW .................................................................................. 26
SVC. SHEET ...............................................................................................
PRINTED CIRCUIT DIAGRAM....................................................................

- 3 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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 Exploded View
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

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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 PD83A 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 : CB specification
EMC : CISPR 13 specification
VGeneral Specification1 ( 50” Module)
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
PDP50XG,
RGB Closed Type, Film Filter
1)Temp. : 0~40deg
2)Humidity : 20~80%
3)Temp. : -20~60deg
4)Humidity : 10~90%
100-240V~, 50/60Hz
Plasma Display Panel
LGE SPEC.
Maker : LG
Chassis
PD83A 50PG3000 Austria,Belgium,Bulgaria,Coratia,Czech,Denmark,Finland,
France,Germany,Greece,Hungary,Italy,Luxembourg,
Netherlands,Norway,Poland,Portugal,Rumania,Russia,Ser
bia,Slovenia,Spain,Sweden,Switzerland,UK
LG
Model Name Market Brand Remark
50PG3000-ZA Safety : IEC/EN60065
EMI : EN55013
EMS : EN55020
Austria,Belgium,Bulgaria,Coratia,Czech,Denmark,Finland
,France,Germany,Greece,Hungary,Italy,Luxembourg,
Netherlands,Norway,Poland,Portugal,Rumania,Russia,
Serbia,Slovenia,Spain,Sweden,Switzerland,UK
Model ApplianceMarket Remark

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VModule Specification
Market
roadcasting system
Receiving system
Scart Jack(2EA)
Video Input (1EA)
S-Video Input (1EA)
Component Input (1EA)
RGB Input
HDMI Input(3EA)
Audio Input (3EA)
1
2
3
4
5
6
7
No Item Specification Remark
Austria,Belgium,Bulgaria,Coratia,Czech,Denmark,Finland
,France,Germany,Greece,Hungary,Italy,Luxembourg,
Netherlands,Norway,Poland,Portugal,Rumania,Russia,
Serbia,Slovenia,Spain,Sweden,Switzerland,UK
1) PAL-BG
2) PAL-DK
3) PAL I, I’
4) DVB T(ID TV)
5) SECAM L/L’
Analog : Upper Heterodyne
Digital : COFDM
PAL, SECAM
PAL, SECAM, NTSC
PAL, SECAM, NTSC
Y/Cb/Cr, Y/Pb/Pr
RGB-PC
HDMI-DTV & SOUND
PC Audio, Component, AV
Analog Only
EU(PAL Marker)
4 System : PAL, SECAM,NTSC,PAL60
4 System : PAL, SECAM,NTSC,PAL60

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Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Object
These instructions are applied all of the 50” PLASMA TV,
PD83A 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 100-240V~,
50/60Hz.
(5) The receiver must be operated for about 15 minutes prior
to the adjustment.
In case of keeping module is in the circumstance of 0°C, it
should be placed in the circumstance of above 15°C for
2hours.
In case of keeping module is in the circumstance of below
-20°C, it should be placed in the circumstance of above
15°C for 3hours.
OAfter RGB Full white HEAT-RUN Mode, the receiver must
be operated prior to adjustment.
OEnter into HEAT-RUN MODE
1) Press the POWER ON KEY on R/C for adjustment.
2) OSD display and screen display PATTERN MODE.
* Set is activated HEAT-RUN without signal generator in
this mode.
* Single color pattern(RED/BLUE/GREEN) of HEAT-RUN
mode uses to check PANEL.
3.
ADC Calibration
V Auto adjustment Map(RS-232C)
- Baud : 115200bps, RS232 Host : PC, Echo : none.
4. ADC adjustment
5. Adjustment of RGB
5-1 . Auto RGB Gain / Offset Adjustment
(1) Convert to PC in Input-source(refer to I2C command at page 10)
(2) Signal equipment displays
Output Voltage : 700 mVp-p
Impress Resolution XGA(1024x768@60Hz)
Model : 60 in pattern Generator
Pattern : 65 in pattern Generator(MSPG-925 Series)
[gray pattern that left & right is black and center is white
signal(Refer below picture)].
(3) Adjust by commanding AUTO_COLOR_ADJUST.
5-2. Confirmation
(1) We confirm whether “0xAA(RGB)” address of EEPROM
“0xA2” is “0xAA” or not.
(2) If “0xAA(RGB)” address of EEPROM “0xA2” isn’t “0xAA”,
we adjust once more.
(3) We can confirm the ADC values from “0xA4~0xA9(RGB)”
address in a page “0xA2”.
* Manual ADC process using Service Remocon. After enter
Service Mode by pushing “ADJ” key, execute “ADC Adjust”
by pushing “G“ key at “ADC CALIBRATION : RGB-C”.
* Using ‘power on’ button off the control R/C, power on TV.
If you turn on a still screen more than 20 minutes, (Especially
digital pattern, cross hatch pattern) after image may be occur in
the black level part of the screen.
ADC adjust
Data Read
Default Write
Enter
Adjust Mode
ADC adjust
ADC Parameter
Digital Data
ADC Parameter
(Average)
Adjustment
Confirmation
Adjust Mode In
Adjust Mode Out
NO Item Remark CMD1 CMD2 Data 0
A
A
A
A
A
A
A
D
D
D
D
D
D
D
0
0
0
0
9
0
0
1
2
3
4
9
0
9
Transfer 18Byte
(Input resolution Data)
To check ADC Adjustment
on Assembly line
When transfer the ‘Mode
In’, Carry the command.
MSPG925FS
Component RGB-PCADC Model : 60
(1024*768 60Hz)
Pattern : 65
Model : 209(480i 60Hz)
223(1080i 60Hz)
Pattern : 65
(Fig.1)

6. Component input ADC
6-1 . Component Gain/Offset Adjustment
(1) Convert to PC in Input-source(refer to I2C command at page 10)
(2) Signal equipment displays
1) Impress Resolution 480i
Model : 209 in pattern Generator(480i Mode)
Pattern : 65 in pattern Generator(MSPG-925 Series)
2) Impress Resolution 1080i
Model : 223 in pattern Generator(1080i Mode)
Pattern : 65 in pattern Generator(MSPG-925 Series)
6-2. Confirmation
(1) We confirm whether “0xB3(480i)/0xBC(1080i)” address
of EEPROM “0xA2” is “0xAA” or not.
(2) If “0xB3(480i)/0xBC(1080i)” address of EEPROM “0xA2”
isn’t “0xAA”, we adjust once more.
(3) We can confirm the ADC values from
“0xAD~0xB2(480i)/0xB6~BB(1080i)” address in a page
“0xA2”.
* Manual ADC process using Service Remocon. After enter
Service Mode by pushing “ADJ” key, execute “ADC Adjust”
by pushing “G“ key at “ADC CALIBRATION : RGB-C”.
7. POWER PCB Assy Voltage
Adjustments (Va, Vs Voltage adjustments)
7-1. Test Equipment :D.M.M. 1EA
7-2.Connection Diagram for Measuring
: refer to Fig.3
7-3. 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 P811, connect
- terminal to GND pin of P811.
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) Input signal : RF noise signal.
2) Connect + terminal of D.M.M to Vs pin of P811, connect
– terminal to GND pin of P811.
3) After turning VR951, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(Deviation; ±0.5V)
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Each PCB assembly must be checked by check JIG set.
(Because power PCB Assembly damages to PDP Module,
especially be careful)
(Fig.3) Connection diagram of power adjustment for measuring
(Fig.2)

8. EDID(The Extended Display Identification Data )
/DDC(Display Data Channel) download
8-1. 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.
8-2. Required Test Equipment
8-3. Preparation for Adjustment
(1) Connect the Set, EDID Download Jig, PC & Cable.
(2) Turn on the PC & EDID Download Jig. Set up the S/W
option.
(3) Power on the Set.
8-4. Sequence of Adjustment
(1) EDID Download
1) Init the data.
2) Load the EDID data.(Open File).
[ Analog file ] (for RGB)
]
[ Digital
file ] (for HDMI)
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.
6) If TV has three HDMI INPUT, Please separate each
INPUT(Each EDID DATA is different).
8-5. EDID DATA
1) Analog-RGB.
=> Detail EDID Options are below([1],[2],[3],[4],[5])
1.[1]-Product ID
2. [2]-Serial No : Controlled on production line.
3. [3]-Month, Year : Controlled on production line.
ex) Monthly: '03' => '03'
Year : '2006' => '10'
4. [4]-Model Name : model name.
5. [5]-Checksum -> Changeable by total EDID data.
2) HDMI_1.
=> Detail EDID Options are below([1],[2],[3],[4],[5])
1.[1]-Product ID
2. [2]-Serial No : Controlled on production line.
3. [3]-Month, Year : Controlled on production line.
ex) Monthly: '03' => '03'
Year : '2006' => '10'
4. [4]-Model Name : model name.
5. [5]-Checksum -> Changeable by total EDID data.
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Only for training and service purposes
(Fig.5) Connection Diagram of DDC download
[1] [2]
[3]
[4] [5]
[1] [2]
[3]
[4] [5]
[5]
50PG3000
Product ID
Product IDModel Name EDID table
9BC3
Hex
C39B
50075
50PG3000
Product ID
Product IDModel Name EDID table
9CC3
Hex
C39C
50076
50PG3000
00 00 00 FC 00 35 30 50 47 33 30 30 30 0A 20 20 20 20
Model Name Model Name(Hex)
50PG3000
00 00 00 FC 00 35 30 50 47 33 30 30 30 0A 20 20 20 20
Model Name Model Name(Hex)

2) HDMI_2.
=> Detail EDID Options are below([1],[2],[3],[4],[5])
* Please refer HDMI_1.
3) HDMI_3.
=> Detail EDID Options are below([1],[2],[3],[4],[5])
* Please refer HDMI_1.
9. Adjustment of White Balance
9-1. Required Equipment
(1) Remote control for adjustment.
(2) Color Analyzer : CS-1000, CA-100,100+, CA210 or same
product.: CH 10
* Please adjust CA-210+, CA-100+ by before measuring.
(3) Auto W/B adjustment instrument.(only for Auto adjustment)
(4) AV Pattern Generator.
(5) 15Pin D-Sub Jack(RGB) is connected to the AUTO W/B
EQUIPMENT.
9-2. AUTO White Balance Process
- Adjust Process will start by execute I2C Command(Inner
pattern (0xF3, 0xFF)).
W Color temperature standards according to CSM and Module.
W CS-1000/CA-100+/CA-210(CH 10) White balance adjustment
coordinate and color temperature.
9-3. Manual W/B process
(using adjusts Remote control)
* Please Adjust in AV 1mode
(1) Enter ‘PICTURE RESET’on Picture Mode, then off Fresh
Contrast and Fresh colour in Advanced Control.
(2) After enter Service Mode by pushing “ADJ”key.
(3) Enter White Pattern off of service mode, and change off ->
on.
(4) Enter “W/B ADJUST”by pushing “G”key at “3. W/B
ADJUST”.
(5) Adjust W/B DATA, for all CSM, choose ‘COPY All’.
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[1] [2]
[3]
[4] [5]
[5]
[1] [2]
[3]
[4] [5]
[5]
* Before adjusting White-balance, the AV ADC should be done.
If ADC status were “NG”, Need to ADC adjustment.
PLASMA Remark
11000K
9300K
6500K
Cool
Normal
Warm
CSM
Color Coordinate
xy
0.283
0.293
0.329
11,000K
9,300K
6,500K
0.002
0.002
0.002
0.276
0.285
0.313
COOL
MEDIUM
WARM
CSM Temp uv

9-4. Auto-control interface and directions
(1) Adjust in the place where the influx of light like floodlight
around is blocked.(illumination is less than 10ux)
(2) Measure and adjust after sticking the Color Analyzer(CA-
100+, CA210) to the side of the module.
(3) Aging time
- After aging start, keep the power on(no suspension of
power supply) and heat-run over 15minutes.
- keep white pattern using inside pattern.
V Auto adjustment Map(I2C)
- I2C(100K BPS)
10. Communication START
* Until ACK BIT goes LOW, Repeat it.
11. Command form
V Command form use DDC2AB standard communication
protocol.
1. LEN : DATA BYTE number to send.
2. CMD : Command language that monitor executes.
3. VAL : FOS DATA
4. CS : Dada’s CHECKSUM that transmit.
5. DELAY : 50MS
6. A : Acknowledge.
12. EEPROM DATA READ
12-1. Single TABLE
12-2. Command Set
* To read the appointment Address of E2PROM by 128(80h)-
byte
13. EEPROM Data Write (Serial No D/L)
13-1. Signal TABLE
CMD : 8Eh
LENGTH : 84h+bytes
ADH : E2PROM Slave Address(A0,A2,A4,A6,A8)
Not 00h(Reserved by Buffer To EEPROM)
ADL : E2PROM Sub Address low (00~FF)
Data : Write data
CS :
CMD + LENGTH + ADH + ADL + Data_1 + ... + Data_n
13-2. Command Set
* Description
FOS Default write : <7mode data> write
Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0, Phase
Data write : Model Name and Serial Number write in EEPROM,.
13-3. Method & Notice
(1) Serial number D/L is using of scan equipment.
(2) Setting of scan equipment operated by Manufacturing
Technology Group.
(3) Serial number D/L must be conformed when it is produced
in production line, because serial number D/L is mandatory
by D-book 4.0.
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Delay 100ms
128Bytes
START 6E A 50 A LEN A03A CMD A00A VAL A CS A STOP
START 6E A STOP 50Ms
E7 A0
A2
A4
A6
0
80
0
80
0
80
0
80
0-page 0~7F Read
0-page 80~7F Read
1-page 0~7F Read
1-page 80~7F Read
2-page 0~7F Read
2-page 80~7F Read
3-page 0~7F Read
3-page 80~7F Read
EEPROM READ
1
2
3
4
5
6
7
8
No. Adjustment
contents
CMD
(hex) ADH (hex) ADL (hex) Details
CMD LENGTH ADH ADL DATA_1 DATA_n ... CS DELAY
No
1
2
EEPROM WRITE E8 94
84+n
16-Byte Write
n-Byte Write
Adjust mode CMD(hex) LENGTH(hex) Description

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FACTORY ON
FACTORY OFF
EEPROM ALL INIT.
EEPROM Read
EEPROM Write
COLOR SAVE
(R/G/B cutoff, Drive,
Contrast, Bright)
H POSITION
V POSITION
CLOCK
PHASE
R DRIVE
G DRIVE
B DRIVE
R CUTOFF
G CUTOFF
B CUTOFF
BRIGHT
CONTRAST
AUTO_COLOR_ADJUST
CHANGE_COLOR_TEMP
White Pattern
AUTO_INPUT CHANGE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
No Adjustment Contents CMD(hex) ADR VAL[HEX] Description
E0
E2
E4
E7
E8
EB
20
30
90
92
16
18
1A
80
82
84
10
12
F1
F2
F3
F4
00
00
00
00
00
00
00
00
00
00
00 : cool
01: medium
02 : warm
00 : cool
01 : medium
02 : warm
00 :cool
01: medium
02: warm
00
00
00
00
00
00
00
00
00
00
00
00
00
data
00
00 - 64
00 - 64
00 - 64
00 - 64
00 - 80
00 - 80
00 - 80
00 - 7F
00 - 7F
00 - 7F
00 - 3F
00 - 64
02
0,1,2,3
00,FF
0,10,20,30,
40,60,90
Factory mode on
Factory mode off
EEPROM All clear
EEPROM Read
EEPROM Write by some values
Color Save
They have different range each mode,
FOS Adjustment
Drive adjustment
Offset adjustment
Bright adjustment
Luminance adjustment
Auto COLOR Adjustment
0 : Cool
1 : Medium
2 : Warm
3 : User
00: White pattern off
FF: White pattern on
0 : TV
10 : DTV
20 : SCART1
30 : SCART2
40 : Component
60 : RGB
90 : HDMI
14. Adjustment Command(LENGTH=84)

15. Set Information (Serial No & Model name)
15-1. Check the serial number & Model name
(1) Push the menu button in DTV mode.
- Select the STATION-> Diagnostics -> To set.
(2) Check the Serial Number.
16. SET factoring condition
(1) This adjustment is setting factory shipment mode.
(2) Push the IN-STOP key of adjustment remote controller before
the factory shipment.
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Only for training and service purposes
1
2
3
4
5
6
7
8
9
10
11
12
Off
15
Antenna
N.A.
Off
16:9
ON
OFF
Engineering
Diagnostics
16:9
Vivid
Contrast
Brightness
Color
Sharpness
Tint
Advanced Control
Picture reset
Off
0
Standard
-- : --
Off
Off
Off
Off
Off
Off
1
Off
Off
New * * * *
Confirm * * * *
TV/DTV/Radio
Off
DTV&ATV
100
50
60
50
0
Color Temp. Medium
Fresh Con. On
Fresh col. On
Noise On
Reduction
Film (3:2) Off
Black level
120Hz 50
200Hz 50
500Hz 50
1.2Khz 50
3Khz 50
7.5Khz 50
12Khz 50
User control
Item ConditionNo
Remark
Power
Volume Level
Main Picture Input
Main Last Channel
Mute
ARC
SETUP Auto Tuning
(DTV&ATV) Manual Tuning
Programme Set
Booster
Software Update
Diagnostics
CI Information
PICTURE Aspect Ratio
Picture Mode
AUDIO Auto Volume
Balance
Sound Mode
Time Clock
Off time
On time
Sleep Timer
Auto Sleep
Time zone
OPTION Menu Language
Audio Language
Subtitle Language
Hard of hearing
Country
Input label
KeyLock
Set ID
Factory Reset
LOCK Lock System
Set Password
Block Program
Parental Guidance

17. SW DOWNLOAD By D-SUB
17-1. Installation of MSTV
(1) Extract to folder ISP_Tool.ZIP
(2) Install ISP_TOOL
You can find the ICON.
17-2. Download bin file
(1) Prepare a Binary File(*.bin)
Connect RGB cable and turn on the power.
(2) Execute ISP Program
Click the Icon.
(3) Click “Connect”Button, and check the below message.
(If display “Can’t ”, Check connect computer, jig, and set.)
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(4) Click “Read”tab, and then load download file(XXXX.bin)
by clicking “Read”
(5) Click “Auto”Button, select the check box, and then Click
“Run”Button.
(6) After downloading, check “OK”message.
(7) Updating Completed, The TV will restart automatically.
After turn on TV, Please press ‘IN-STOP’button on ADJ
Remote-control.
* IF you don’t have ADJ R/C, enter ‘Factory Reset’in
OPTION MENU.
(8) When TV turn on, check the Updated version on
Diagnostics MENU.
2. USB DOWNLOAD
- Put a *.bin to USB Stick and Turn on TV
(1) Put the USB Stick to the USB socket
(2) Automatically detecting update file in USB Stick
* If your downloaded program version in USB Stick is Low,
it didn’t work.
But your downloaded version is High, USB data is
automatically detecting.
(3) Show the message “Copying files from memory”
(4) Updating is staring.
(5) Updating Completed, The TV will restart automatically.
After turn on TV, Please press ‘IN-STOP’button on ADJ
Remote-control.
*IF you don’t have ADJ R/C, enter ‘Factory Reset’in
OPTION MENU.
(6) When TV turn on, check the Updated version on
Diagnostics MENU.
- 14 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

- 15 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLE SHOOTING GUIDE
1. Power Board
1-1. The whole flowchart which it follows in voltage output state
Start check
Manufacture enterprise
meaning of a passage
1. Check the Power Off
condition.
Doesn't the
screen whole come
out?
Is it identical
with Power Off
condition?
Yes
Yes
No
No
No
No
No
2. Check the Interface
signal condition.
Is the Interface
signal operated?
Yes
3. Check the St-by 5V
signal circuit.
Doesn't the
low pressure output
come out?
Doesn't the
St-by 5V signal
come out?
Yes
Yes
No
4. Check the 5V Monitor
signal circuit.
Doesn't the
5V Monitor signal
come out?
Yes
7. Check the VSC Vs-ON
signal
Doesn't the
high tension output
come out?
Doesn't the
VSC signal Vs-ON
come out?
Yes
Yes
Does
high tension
output voltage Drop
occur?
When the
Y B/D Module
input connector is
removed, does output
voltage drop
occur?
When the
Y, Z B/D Module
input connector is remove,
does Power Board hightension
output voltage Drop
occur?
Yes No No
9. Check the Power
Board Output high
tension circuit
Yes
10. Check the Z B/D
Module output circuit
Yes
When the
Z B/D Module
input connector is
removed, does output
voltage Drop
occurs?
11. Check the Y B/D
Module output circuit
Yes
No
8. Check the Vs, Va
voltage output circuit.
Doesn't the
Vs, Va voltage output
come out?
Yes
No
No
5. Check the VSC RL-ON
signal.
Doesn't the
VSC signal RL-ON
come out?
Yes
6. Check the VSC low
pressure output
Doesn't the
VSC low pressure
output come out?
Yes

- 16 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1-2. 50” Power Board Structure

- 17 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. No Power
(1) Symptom
1) Doesn’t minute discharge at module.
2) Non does not come in into the front LED.
(2) Check following
Is plug in power cord? Plug in power cord.
Yes
No
Is the Line Filter and Power
Board Cable connected? Connect the Cable.
Yes
No
Is the Fuse(F801) on
Power Board normal? Replace the Fuse.
Yes
No
Is the Power Board and 22P of
VSC Board Cable connected? Connect the Cable.
Yes
No
After the cable connect is removed
to Power Board, authorized the AC
voltage marking on manual.
When ST-BY 5V is not operated,
replace Power Board.

- 18 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Protect Mode
(1) Symptom
1) After once shining, it does not discharge minutely
from module.
2) The Rely falls.(The sound is audible “click”)
3) It is converted with the color where the front LED
is red from green.
(2) Check following
Is the Power Board
normal ? Replace Power Board.
Is output the normality Low/High
voltage except Stand-by 5V?
Yes
No No
Is the each connector
normal? Replace the connector.
Replace
Y-Board.
After connecting well each connector,
the normality it operates?
Yes
No Yes
Is the Ctrl Board
normal? Replace X-Board.
Is the output voltage normal after
remove P161, P162 connector of Ctrl-
B/D?
Yes
No Yes
Is the Y-Board
normal?
Is the output voltage
normal after remove
P201 connector of
Y-B/D?
Is the Fuse(FS202) on Y-B/D
normal?(In case of open is replace)
Yes
No Yes Yes
Replace
Z-Board.
Is the Z-Board
normal? Is the output voltage after remove P801 connect of Z-B/D normal?
Yes
No Yes
Is the X- Board
normal?
Is the output voltage normal after
remove P211, P311 connector of
X-B/D?
After remove P311 output voltage normality:
Replace Right X-B/D
After remove P211 output voltage normality:
Replace Left X-B/D
Yes
No Yes
Is the
VSC Board normal? Is the output voltage normal after remove P801?
After crisis COF of each board, check the normality operates.
If in case normality operates, correspondence COF Fail is replace the module.
After remove P801 normal
operation: Replace VSC Board
Yes
No
Is the COF of X, Y, Z
normal ?
No
Yes

- 19 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Does minute discharge
At Module?
Is the LVDC cable
normal?
Is the VAVS on?
Check the PDP Module
Yes
No
YES
Yes
Reconnect the LVDS
cable in P400
No
Is the IC100(LGE7383C)
Output normal? Replace the VSC.
No
NO Replace the Power
board
Is output the normality
Low/High voltage except
stand-by 5V?
NO
4. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is green.
(2) Check following

- 20 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. In case of occurring strange screen into specific mode
5-1. In case the OSD does not displayed
(1) Symptom
1) LED is green.
2) The minute discharged continuously becomes Accomplished from module.
(2) Check following
Is the LVDS cable
normal ?
Is the VSC Board
normal?
Is the LVDS cable
connected?
Re-insert the Cable inserts.
Yes
No
No
Yes
Does the IC100
Operates ?(LGE7383C)
Replace IC100
(LGE7383C)
No
Is the Ctrl Board of
Module normal? Replace Ctrl B/D.
No
No
Yes Replace hte VSC B/D
Replace the cable.
Yes