LG 42PG3000 User manual

PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : PD83A
MODEL : 42PG3000 42PG3000-ZA
website:htt ://biz.LGservice.com
Internal Use Only

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

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SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special sa ety-related characteristics. These parts are identi ied by in the
Schematic Diagram and Replacement Parts List.
It is essential that these special sa ety parts should be replaced with the same components as recommended in this manual to prevent
X-RADIATION, Shock, Fire, or other Hazards.
Do not modi y the original design without permission o manu acturer.
General Guidance
An isolation Transformer should always be used during the
servicing o a receiver whose chassis is not isolated rom the AC
power line. Use a trans ormer o adequate power rating as this
protects the technician rom accidents resulting in personal injury
rom electrical shocks.
It will also protect the receiver and it's components rom being
damaged by accidental shorts o the circuitry that may be
inadvertently introduced during the service operation.
I any use (or Fusible Resistor) in this monitor is blown, replace it
with the speci ied.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away rom PCB.
Keep wires away rom high voltage or high temperature parts.
Due to high vacuum and large sur ace area o picture tube,
extreme care should be used in handling the Picture Tube.
Do not li t the Picture tube by it's Neck.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed rom AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead o 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.
I the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩ and 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be in inite.
An other abnormality exists that must be corrected be ore 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 or 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 o the limits speci ied, there is
possibility o shock hazard and the set must be checked and
repaired be ore 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 : Speci ications and others are subject to change without notice or improvement .
VApplication Range
This spec is applied to the 42” 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 o each product is marked by models.
4) Speci ication and per ormance o each parts are ollowed each drawing and speci ication by part number in accordance with SBOM.
5) The receiver must be operated or about 20 minutes prior to the adjustment.
VTest Method
1) Per ormance : LGE TV test method ollowed.
2) Demanded other speci ication
Sa ety : CE, IEC speci ication
EMC : CE, IEC
VGeneral Specification ( 42”XGA )
Chassis
PD83A 42PG3000 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
Display Screen Device
Aspect Ratio
PDP Module
Operating Environment
Storage Environment
Input Voltage
1
2
3
4
5
6
No Item Speci ication Remark
42” Wide Color Display Module
16:9
PDP42XG,
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
42PG3000-ZA Sa ety : 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 Specification2
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 Speci ication 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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ADJUSTMENT INSTRUCTION
1. Application Object
These instructions are applied all o the 42” PLASMA TV,
PD83A Chassis.
2. Note
(1) Because this is not a hot chassis, it is not necessary to use
an isolation trans ormer. However, the use o isolation
trans ormer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be per ormed in the circumstance o
25±5°C o temperature and 65±10% o relative humidity i
there is no speci ic designation.
(4) The input voltage o the receiver must keep 100-240V~,
50/60Hz.
(5) The receiver must be operated or about 15 minutes prior
to the adjustment.
In case o keeping module is in the circumstance o 0°C, it
should be placed in the circumstance o above 15°C or
2hours.
In case o keeping module is in the circumstance o below
-20°C, it should be placed in the circumstance o above
15°C or 3hours.
OA ter 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 or 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) o 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(re er 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 le t & right is black and center is white
signal(Re er below picture)].
(3) Adjust by commanding AUTO_COLOR_ADJUST.
5-2. Confirmation
(1) We con irm whether “0xAA(RGB)” address of EEPROM
“0xA2” is “0xAA” or not.
(2) I “0xAA(RGB)” address o EEPROM “0xA2” isn’t “0xAA”,
we adjust once more.
(3) We can con irm the ADC values rom “0xA4~0xA9(RGB)”
address in a page “0xA2”.
* Manual ADC process using Service Remocon. A ter enter
Service Mode by pushing “ADJ” key, execute “ADC Adjust”
by pushing “G“ key at “ADC CALIBRATION : RGB-C”.
* Using ‘power on’ button o the control R/C, power on TV.
I you turn on a still screen more than 20 minutes, (Especially
digital pattern, cross hatch pattern) a ter image may be occur in
the black level part o the screen.
ADC adjust
Data Read
De ault Write
Enter
Adjust Mode
ADC adjust
ADC Parameter
Digital Data
ADC Parameter
(Average)
Adjustment
Con irmation
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
Trans er 18Byte
(Input resolution Data)
To check ADC Adjustment
on Assembly line
When trans er 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)

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6. Component input ADC
6-1 . Component Gain/Offset Adjustment
(1) Convert to PC in Input-source(re er 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 con irm whether “0xB3(480i)/0xBC(1080i)” address
of EEPROM “0xA2” is “0xAA” or not.
(2) I “0xB3(480i)/0xBC(1080i)” address o EEPROM “0xA2”
isn’t “0xAA”, we adjust once more.
(3) We can con irm the ADC values rom
“0xAD~0xB2(480i)/0xB6~BB(1080i)” address in a page
“0xA2”.
* Manual ADC process using Service Remocon. A ter enter
Service Mode by pushing “ADJ” key, execute “ADC Adjust”
by pushing “G“ key at “ADC CALIBRATION : RGB-C”.
7. PO ER PCB Assy Voltage
Adjustments (Va, Vs Voltage adjustments)
7-1. Test Equipment : D.M.M. 1EA
7-2.Connection Diagram for Measuring
: re er to Fig.3
7-3. Adjustment Method
(1) Va Adjustment
1) A ter receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal o D.M.M to Va pin o P811, connect
- terminal to GND pin o P811.
3) A ter turning VR901, voltage o D.M.M adjustment as
same as Va voltage which on label o panel right/top.
(Deviation; ±0.5V)
(2) Vs Adjustment
1) Input signal : RF noise signal.
2) Connect + terminal o D.M.M to Vs pin o P811, connect
– terminal to GND pin o P811.
3) A ter turning VR951, voltage o D.M.M adjustment as
same as Va voltage which on label o 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 care ul)
(Fig.2)
(Fig.3) Connection diagram o power adjustment or measuring

8. EDID(The Extended Display Identification Data )
/DDC(Display Data Channel) download
8-1. Required Test Equipment
(1) Adjusting PC with S/W or writing EDID Data.
(S/W : EDID TESTER Ver.2.5)
(2) A Jig or 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 ile ] ( or RGB)
]
[ Digital
ile ] ( or HDMI)
3) Set the S/W as below.
4)
Push the “Write Data & Veri y”button. And con irm “Yes”.
5) I the writing is inished, you will see the “OK” message.
6) I TV has three HDMI INPUT, you must download three
times or each HDMI.
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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(Fig.5) Connection Diagram o DDC download
[1] [2]
[3]
[4] [5]
[1] [2]
[3]
[4] [5]
[5]
42PG3000
Product ID
Product IDModel Name EDID table
019D
Hex
9D11
40193
42PG3000
Product ID
Product IDModel Name EDID table
029D
Hex
9D02
40194
42PG3000
00 00 00 FC 00 34 32 50 47 33 30 30 30 0A 20 20 20 20
Model Name Model Name(Hex)
42PG3000
00 00 00 FC 00 34 32 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 re er HDMI_1.
3) HDMI_3.
=> Detail EDID Options are below([1],[2],[3],[4],[5])
* Please re er HDMI_1.
9. Adjustment of hite Balance
9-1. Required Equipment
(1) Remote control or adjustment.
(2) Color Analyzer : CS-1000, CA-100,100+, CA210 or same
product.: CH 10
* Please adjust CA-210+, CA-100+ by be ore measuring.
(3) Auto W/B adjustment instrument.(only or Auto adjustment)
(4) AV Pattern Generator.
(5) 15Pin D-Sub Jack(RGB) is connected to the AUTO W/B
EQUIPMENT.
9-2. AUTO hite 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 /B process
(using adjusts Remote control)
(1) A ter enter Service Mode by pushing “ADJ” key.
(2) Enter White Pattern o o service mode, and change o ->
on.
(3) Enter “W/B ADJUST” by pushing “G” key at “3. W/B
ADJUST”.
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[1] [2]
[3]
[4] [5]
[5]
[1] [2]
[3]
[4] [5]
[5]
* Be ore adjusting White-balance, the AV ADC should be done.
I 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
0.000
0.000
0.003
0.276
0.285
0.313
COOL
MEDIUM
WARM
CSM Temp uv

9-4. Connection Picture of the Measuring
Instrument(On Automatic control)
(1) Inside PATTERN is used when W/B is controlled. Connect
to auto controller or push control R/C IN-START -> Enter
the mode o White-Balance, the pattern will come out.
9-5. Auto-control interface and directions
(1) Adjust in the place where the in lux o light like loodlight
around is blocked.(illumination is less than 10ux)
(2) Measure and adjust a ter sticking the Color Analyzer(CA-
100+, CA210) to the side o the module.
(3) Aging time
- A ter aging start, keep the power on(no suspension o
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 orm 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 o E2PROM by 128(80h)-
byte
13. EEPROM Data rite (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 Bu er 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 De ault 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 o scan equipment.
(2) Setting o scan equipment operated by Manu acturing
Technology Group.
(3) Serial number D/L must be con ormed when it is produced
in production line, because serial number D/L is mandatory
by D-book 4.0.
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(Fig.6) Auto AV(CVBS) Color Balance Test Pattern
Full White Pattern
RS-232C Communication
CA-210
Color
ANALYZER
TYPE : CA-210
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 cuto , 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 o
EEPROM All clear
EEPROM Read
EEPROM Write by some values
Color Save
They have di erent range each mode,
FOS Adjustment
Drive adjustment
O set adjustment
Bright adjustment
Luminance adjustment
Auto COLOR Adjustment
0 : Cool
1 : Medium
2 : Warm
3 : User
00: White pattern o
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 actory shipment mode.
(2) Push the IN-STOP key o adjustment remote controller be ore
the actory shipment.
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1
2
3
4
5
6
7
8
9
10
11
12
O
15
Antenna
N.A.
O
16:9
ON
OFF
Engineering
Diagnostics
16:9
Vivid
Contrast
Brightness
Color
Sharpness
Tint
Advanced Control
Picture reset
O
0
Standard
-- : --
O
O
O
O
O
O
1
O
O
New * * * *
Con irm * * * *
TV/DTV/Radio
O
DTV&ATV
100
50
60
50
0
Color Temp. Medium
Fresh Con. On
Fresh col. On
Noise On
Reduction
Film (3:2) O
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
So tware Update
Diagnostics
CI In ormation
PICTURE Aspect Ratio
Picture Mode
AUDIO Auto Volume
Balance
Sound Mode
Time Clock
O time
On time
Sleep Timer
Auto Sleep
Time zone
OPTION Menu Language
Audio Language
Subtitle Language
Hard o hearing
Country
Input label
KeyLock
Set ID
Factory Reset
LOCK Lock System
Set Password
Block Program
Parental Guidance

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17. S DO NLOAD By D-SUB
17-1. Installation of MSTV
(1) Extract to older ISP_Tool.ZIP
(2) Install ISP_TOOL
You can ind 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.
(I display “Can’t ”, Check connect computer, jig, and set.)

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(4) Click “Read” tab, and then load download ile(XXXX.bin)
by clicking “Read”
(5) Click “Auto” Button, select the check box, and then Click
“Run” Button.
(6) A ter downloading, check “OK” message.
(7) Updating Completed, The TV will restart automatically.
A ter 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 DO NLOAD
- Put a *.bin to USB Stick and Turn on TV
(1) Put the USB Stick to the USB socket
(2) Automatically detecting update ile in USB Stick
* I 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 iles rom memory”
(4) Updating is staring.
(5) Updating Completed, The TV will restart automatically.
A ter 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.

- 15 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only or training and service purposes
TROUBLE SHOOTING GUIDE
1. Power Board
1-1. The whole flowchart which it follows in voltage output state
Start check
Manu acture enterprise
meaning o a passage
1. Check the Power O
condition.
Doesn't the
screen whole come
out?
Is it identical
with Power O
condition?
Yes
Yes
No
No
No
No
No
2. Check the Inter ace
signal condition.
Is the Inter ace
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 or training and service purposes
1-2. 42” Power Board Structure

- 17 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only or training and service purposes
2. No Power
(1) Symptom
1) Doesn’t minute discharge at module.
2) Non does not come in into the ront 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 o
VSC Board Cable connected? Connect the Cable.
Yes
No
A ter 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 or training and service purposes
3. Protect Mode
(1) Symptom
1) A ter once shining, it does not discharge minutely
rom module.
2) The Rely alls.(The sound is audible “click”)
3) It is converted with the color where the ront LED
is red rom 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.
A ter connecting well each connector,
the normality it operates?
Yes
No Yes
Is the Ctrl Board
normal?
Replace
X-Board.
Is the output voltage normal a ter
remove P161, P162 connector o Ctrl-
B/D?
Yes
No Yes
Is the Y-Board
normal?
Is the output voltage
normal a ter remove
P201 connector o
Y-B/D?
Is the Fuse(FS202) on Y-B/D
normal?(In case o open is replace)
Yes
No Yes Yes
Replace
Z-Board.
Is the Z-Board
normal?
Is the output voltage a ter remove
P801 connect o Z-B/D normal?
Yes
No Yes
Is the X- Board
normal?
Is the output voltage normal a ter
remove P211, P311 connector o
X-B/D?
A ter remove P311 output voltage normality:
Replace Right X-B/D
A ter remove P211 output voltage normality:
Replace Le t X-B/D
Yes
No Yes
Is the
VSC Board normal?
Is the output voltage normal a ter
remove P801?
A ter crisis COF o each board, check the normality operates.
I in case normality operates, correspondence COF Fail is replace the module.
A ter remove P801 normal
operation: Replace VSC Board
Yes
No
Is the COF o X, Y, Z
normal ?
No
Yes

- 19 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only or 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 ront LED is green.
(2) Check following

- 20 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only or 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 rom 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 o
Module normal? Replace Ctrl B/D.
No
No
Yes
Replace hte VSC B/D
Replace the cable.
Yes