LG 50PG2000 User manual

PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : PD83A
MODEL : 50PG2000 50PG2000-ZA
website:http://biz.LGservice.com
Internal Use Only

- 2 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ..........................................................................3
SPECIFICATION........................................................................................4
ADJUSTMENT INSTRUCTION .................................................................7
TROUBLE SHOOTING............................................................................14
BLOCK DIAGRAM...................................................................................23
EXPLODED VIEW .................................................................................. 25
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 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 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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 : CE, IEC specification
EMC : CE, IEC
VModule Specification
(1) 42”
Display Screen Device
Aspect Ratio
PDP Module
Operating Environment
Storage Environment
Input Voltage
1
2
3
4
5
6
No Item Specification Remark
42 inch 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
PDP
LGE SPEC.
Maker LG
Chassis
PD83A 42PG10/20/3000
50PG10/20/3000
60PG3000
UK, German, Italy, France, Sweden, Finland, Spain,
Netherlands, Belgium, Luxembourg, Greece, Denmark,
Czech, Austria, Poland, Portugal, Norway, Rumania,
Hungary, Bulgaria,Coratia, Serbia, Swiss, Slovenia,
Russia
LG
Model Name Market Brand Remark
42PG10/20/3000
50PG10/20/3000
60PG3000
Safety : IEC/EN60065
EMI : EN55013
EMS : EN55020
UK, German, Italy, France, Sweden, Finland, Spain,
Netherlands, Belgium, Luxembourg, Greece, Denmark,
Czech, Austria, Poland, Portugal, Norway, Rumania,
Hungary, Bulgaria,Coratia, Serbia, Swiss, Slovenia,
Russia
Model ApplianceMarket
TEST
Remark

- 5 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
(2) 50”
Display Screen Device
Aspect Ratio
PDP Module
Operating Environment
Storage Environment
Input Voltage
1
2
3
4
5
6
No Item Specification Remark
50 inch 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
PDP
LGE SPEC.
Maker LG
(3) 60”
Display Screen Device
Aspect Ratio
PDP Module
Operating Environment
Storage Environment
Input Voltage
1
2
3
4
5
6
No Item Specification Remark
60 inch Wide Color Display Module
16:9
PDP60X7####,
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
PDP
LGE SPEC.
Maker LG

- 6 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VModel General Specification
Market
Broadcasting 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
8
9
10
No Item Specification Remark
UK, German, Italy, France, Sweden, Finland, Spain,
Netherlands, Belgium, Luxembourg, Greece, Denmark,
Czech, Austria, Poland, Portugal, Norway, Rumania,
Hungary, Bulgaria,Coratia, Serbia, Swiss, Slovenia, Russia
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
4 System : PAL, SECAM,NTSC,PAL60
4 System : PAL, SECAM,NTSC,PAL60
SPEC OUT FOR 42/50PG1000
SPEC OUT FOR 42/50PG1000
1EA HDMI FOR 42/50PG1000
L/R Input

- 7 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This spec sheet is applied all of the PDP TV, PD83A chassis.
2. Specification.
(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 5 minutes prior to
the adjustment when module is in the circumstance of over
15°
- In case of keeping module is in the circumstance of 0°C,
it should be placed in the circumstance of above 15°C for
2 hours
- 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 3 hours,.
OAfter RGB Full White in HEAT-RUN Mode, the receiver
must be operated prior to the 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 (WHITE) of HEAT RUN MODE uses to
check panel.
Caution: If you turn on a still screen more than 20 minutes
(Especially digital pattern, cross hatch pattern), an
after image may be occur in the black level part of the
screen.
Caution: Using ‘power on’ button of the control R/C, power on
TV.
3. ADC Calibration Protocol (RS232)
- Baud rate :115200 bps
- RS232 Host : PC
- echo : none
4. ADC Adjustment
4-1. Adjustment of RGB
(1) Auto RGB Gain/Offset Adjustment
1) Convert to PC in Input-source (refer to I2C command)
2) Signal equipment displays
Output Voltage: 700 mVp-p
Impress Resolution XGA (1024 x 768 @ 60Hz)
Model : 60 in Pattern Generator
Pattern : 65 in Pattern Generator (MSPG-925 SERISE)
3) Adjust by commanding AUTO_COLOR_ADJUST
(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)”
addresses 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”
4-2. COMPONENT input ADC
(1) Component Gain/Offset Adjustment
1) Convert to Component in Input-source (refer to I2C
command)
2) Signal equipment displays
Impress Resolution 480i
MODEL: 209 in Pattern Generator(480i Mode)
PATTERN : 65 in Pattern Generator( MSPG-925 SERISE)
Impress Resolution 1080i
MODEL: 223 in Pattern Generator(1080i Mode)
PATTERN: 65 in Pattern Generator( MSPG-925 SERISE)
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

(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)” addresses 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 :COMPONENT”.
Caution: Each PCB assembly must be checked by check JIG
set.
(Because power PCB Assembly damages to PDP
Module, especially be careful)
5. POWER PCB Assembly Voltage
Adjustment(Va, Vs voltage Adjustment)
5-1. Test Equipment:D.M.M 1EA
5-2. Connection Diagram for Measuring:
Refer to fig.1
5-3. Adjustment Method
Before Voltage ADJ, do HEAT RUN on 100% Full White
Pattern. (or RF(ATV) Noise Pattern)
(1) 42” EAY39333001 Va Adjustment (refer fig.1)
1) Connect + terminal of D. M..M. to Va pin of P811, connect -
terminal to GND pin of P811.
2) 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) 42” EAY39333001 Vs Adjustment (refer fig.1)
1) Connect + terminal of D. M..M. to Vs pin of P811, connect -
terminal to GND pin of P811.
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)
(3) 50” EAY39190301 Va Adjustment (refer fig.1)
1) Connect + terminal of D. M.M. to Va pin of P811, connect -
terminal to GND pin of P811.
2) After turning VR901,voltage of D.M.M adjustment as same
as Va voltage which on label of panel right/top (deviation;
±0.5V)
(4) 50” EAY39190301 Vs Adjustment (refer fig.1)
1) Connect + terminal of D. M..M. to Vs pin of P811, connect
-terminal to GND pin of P811.
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)
(5) 42” EAY43509401 Va Adjustment (refer fig.1)
1) Connect + terminal of D. M.M. to Va pin of P11, connect -
terminal to GND pin of P11.
2) After turning VR951,voltage of D.M.M adjustment as same
as Va voltage which on label of panel right/top (deviation;
±0.5V)
(6) 42” EAY43509401 Vs Adjustment (refer fig.1)
1) Connect + terminal of D. M..M. to Vs pin of P11, connect -
terminal to GND pin of P11.
2) After turning VR901, voltage of D.M.M adjustment as same
as Vs voltage which on label of panel right/top (deviation ;
±0.5V)
(7) 60” EAY41410101 Vs Adjustment (refer fig.1)
1) Connect + terminal of D. M.M. to Va pin of P816, connect -
terminal to GND pin of P816.
2) After turning VR901,voltage of D.M.M adjustment as same
as Va voltage which on label of panel right/top (deviation;
±0.5V)
(8) 60” EAY41410101 Vs adjustment (refer fig.1)
1) Connect + terminal of D. M..M. to Vs pin of P816, connect -
terminal to GND pin of P816.
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)
- 8 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
<42 inch EAY39333001>
<42 inch EAY43509401>

(Fig. 1) Connection Diagram of Power Adjustment for Measuring.
6. EDID(The Extended Display Identification Data )
/DDC(Display Data Channel) Download
6-1. 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.
6-2. Setting of Device
6-3. 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
6-4. Sequence of Adjustment(EDID Download)
(1) Init the data
(2) Load the EDID data.(Open File).
(3) Set the S/W to download.
(4) Push the “Write Data & Verify” button. And confirm “Yes”
(5) If the writing is finished, you will see the “OK” message.
* If TV has three HDMI INPUT, Please separate each INPUT
(Each EDID DATA is different.)
7. Download Serial Number (RS-232C)
(1) Press “Power on” key of service R/C.(Baud rate: 115200
bps)
(2) Connect RS232 Signal Cable to RS-232 Jack.
(3) Write Serial number by use RS-232.
(4) Must check the serial number at the Diagnostics of SET
UP menu.
(Refer to below ‘6.SET INFORMATION’).
8. EDID DATA
(1) Analog RGB
ODetail EDID Options are below (ⓐ, ⓑ, ⓒ, ⓓ, ⓔ)
ⓐProduct ID
- 9 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
<50 inch EAY39190301>
<60 inch EAY41410101>
(Fig. 2) Connection Diagram of DDC Download

ⓑSerial No
=> Controlled on production line
ⓒMonth, Year
=> Controlled on production line:
ex) Week: ‘03’ -> ‘03’
Year: ‘2006’ -> ‘10’
ⓓModel Name(Hex)
ⓔChecksum
=> Changeable by total EDID data
(2) HDMI_1
ODetail EDID Options are below (ⓐ, ⓑ, ⓒ, ⓓ, ⓔ)
ⓐProduct ID
ⓑSerial No
=> Controlled on production line
ⓒMonth, Year
=> Controlled on production line:
ex) Week: ‘03’ -> ‘03’
Year: ‘2006’ -> ‘10’
ⓓModel Name(Hex)
ⓔChecksum
=> Changeable by total EDID data
(3) HDMI_2
ODetail EDID Options are below (ⓐ, ⓑ, ⓒ, ⓓ, ⓔ)
=> Please refer HDMI_1(Not apply 42/50PG1000-ZA)
(4) HDMI_3
ODetail EDID Options are below (ⓐ, ⓑ, ⓒ, ⓓ, ⓔ)
=> Please refer HDMI_1(Not apply 42/50PG1000-ZA)
- 10 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

Before adjusting White-balance, the AV ADC should be done.
If ADC status were “NG”, Need to ADC adjustment.
9. Adjustment of White Balance
9-1. Required Equipment
(1) Remote Controller for Adjustment
(2) Color Analyzer (CS-1000, CA-100,100+,CA-210 or same
product ): CH 10 (PDP)
* Please adjust CA-210, CA-100+ by CS-1000 before
measuring
(3) Auto W/B adjustment instrument(only for Auto adjustment)
(4) 15 Pin D-Sub Jack(RGB) is connected to the AUTO W/B
EQUIPMENT.
9-2. AUTO White Balance Process.
Before Adjust of White Balance, Please press POWER ONLY
key
Adjust Process will start by execute I2C Command (Inner
pattern (0xF3, 0xFF)).
OColor temperature standards according to CSM and Module
OCS-1000/CA-100+/CA-210(CH 10) White balance
adjustment coordinates and color temperature.
9-3. Manual W/B Process (using adjusts Remote control)
Please Adjust in AV 1 MODE
(1) Enter “PICTURE RESET” on Picture Mode, then turn 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’
* Don’t make any Gain Value over 192 and please fix one
Value on 192, between B and R
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 5 minutes
9-5.
Auto Adjustment Map(I2C)
(1) I2C (100K BPS)
(2) COMMUNICATION START
# Until ACK BIT goes LOW, Repeat it.
(3) Command form.
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 CHECHSUM that transmit
5) DELAY: 50MS
6) A: Acknowledge
- 11 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
START 6E A 50 A LEN A03A CMD A00A VAL A CS A STOP
START 6E A STOP 50Ms
PLASMA Remark
11000K
9300K
6500K
Cool
Medium
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 ±Color
Coordinate

- 12 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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 - C0
00 - C0
00 - C0
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
(4) Adjustment Commands (LENGTH = 84)

(5) EEPROM DATA READ
1) Signal TABLE
2) Command Set
* To read the appointment Address of E2PROM by 128(80h)-
byte
(6) EEPROM Data Write(serial number D/L)
1) Signal TABLE
CMD : 8Eh
LENGTH : 84h+Byte
ADH : E2PROM Slave Address (A0, A2, A4, A6, A8),
Not 00h (Reserved by Buffer To EEPROM)
ADL : E2PROM Sub Address (00~FF)
Data : Write data
2) Command Set
* Description
- EDID write : 16-byte by 16-byte, 8 order (128-byte) write
(TO “00 - 7F” of “EEPROM Page A4”)
- FOS Default write : 16-mode data (HFh,HFl,VF,STD,HP,
VP,Clk,ClkPh,PhFine) write
- Random Data write : write the appointment Address of
E2PROM
3) VRAM Read.
- Send CMD(70h) to read Video RAM value from MICOM
And save its value to 128-Bytes Buffer(Common Buffer
for the use of EDID)
- Delay 500ms ( Time to Wait and Read Video RAM from
MICOM)
- Be transmitted the contents of MICOM°Øs 128-bytes
Buffer to PC.
(128th Data is the CheckSum of 127-bytes data :
That’s OK if the value of adding 128-bytes Data is Zero)
10. Set Information(Serial No & Model name)
10-1. 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
- 13 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Delay 100ms
128Bytes
E7 A0
A2
A4
A6
0
80
0
80
0
80
0
80
0-page 0~7F Read
0-page 80~FF Read
1-page 0~7F Read
1-page 80~FF Read
2-page 0~7F Read
2-page 80~FF Read
3-page 0~7F Read
3-page 80~FF Read
EEPROM READ
1
2
3
4
5
6
7
8
No. Adjustment
contents
CMD
(hex) ADH (hex) ADL (hex) Details
START
6F A Data1 ... AData128 CS NA STOP
START 6E A 50 A 84 A03A 70 A00A 00 A CS A STOP

- 14 - 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

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

- 16 - 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.

- 17 - 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

- 18 - 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

- 19 - 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

- 20 - LGE Internal Use OnlyCopyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5-2. In case of does’t display the screen into specific mode
(1) Symptom
1) The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check following
1) Check the all input mode should become normality display .
(3) In case of becomes unusual display from RF mode
(4) In the case of becomes unusual display from side S-video/AV mode
(5) In the case of becomes unusual display from Component, RGB mode
Is the Tuner normal? Is the Tuner Cable connected?
Re-insert the Cable.
Yes
No
No
Is the IC100(LGE7383C)
normal?
Replace the Tuner.
No
Is the Input voltage, IIC Communication
and CVBS output normal?
Yes
Is normal the Input voltage, IIC
Communication?
No
Block A
Replace the IC.
No
Is the Video input of the AV
Jack(JK700, 707)normal?
Yes
Check the input source and Cable
No
Same as Block A
Is theR,G,B input and H,V Sync
of the JK701,703 normal? Check the input source
No
Yes
Same as Block A