Internal Use Only
website:http://biz.LGservice.com

PLASMA TV SERVICE MANUAL

CHASSIS : PD74A

MODEL : 50PT85

50PT85-ZB

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CONTENTS

SAFETY PRECAUTIONS...3 SPECIFICATIONS...4 ADJUSTMENT INSTRUCTIONS...6 TROUBLE SHOOTING GUIDE...13 BLOCK DIAGRAM...25 EXPLODED VIEW....26 EXPLODED VIEW PARTS LIST..27 REPLACEMENT PARTS LIST...28 SCHEMATIC DIAGRAM.... PRINTED CIRCUIT DIAGRAM...
Copyright 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

LGE Internal Use Only

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

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 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

AC Volt-meter

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 1M and 5.2M. 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.
To Instrument's exposed METALLIC PARTS

0.15uF

Good Earth Ground such as WATER PIPE, CONDUIT etc.

1.5 Kohm/10W

SPECIFICATIONS
NOTE : Specifications and others are subject to change without notice for improvement.

Application Range

This spec is applied to the 50 PLASMA TV used PD74A Chassis. Chassis PD74A Model Name 50PT85 Market UK,France, Germany, Spain, Sweden, Finland, Italy Brand LG Remark

Specification

Each part is tested as below without special appointment. 1) Temperature : 255C (779F), CST : 405 2) Relative Humidity: 6510% 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.

Test Method

1) Performance : LGE TV test method followed. 2) Demanded other specification Safety : CE, IEC specification EMC : CE, IEC Model 50PT85 Market UK,France, Germany, Spain, Sweden, Finland, Italy Appliance Safety : IEC/EN60065 EMI : EN55013, EMS : EN55020 Remark Not yet TEST
General Specification ( 50 XGA Module)
No 3 Item Display Screen Device Aspect Ratio PDP Module Specification 50 Wide Color Display Module 16:9 PDP50X4A, RGB Closed Type 4 Operating Environment 1)Temp. : 0~40deg LGE SPEC. Glass Filter Remark

Plasma Display Panel

2)Humidity : 0~85% 5 Storage Environment 3)Temp. : -20~60deg
4)Humidity : 0~85% 6 Input Voltage 100-240V~, 50/60Hz Maker : LG

Module Specification

No 1 Market Item Specification UK,France, Germany, Spain, Sweden, Finland, Italy 2 Broadcasting system 1) PAL-BG 2) PAL - DK 3) PAL - I, I 4) DVB - T(ID TV) 3 Receiving system Analog : Upper Heterodyne Digital : COFDM 4 SCART Jack(2EA) PAL, SECAM Scart 1 Jack is Full scart and support RF-OUT (analog) Scart 2 Jack is Half scart and support MNT-OUT Video Input (2EA) S-Video Input (1EA) Component Input (1EA) RGB Input PAL, SECAM, NTSC PAL, SECAM, NTSC Y/Cb/Cr, Y/Pb/Pr RGB-PC RGB-DTV 9 HDMI Input(2EA) HDMI-PC HDMI-DTV & SOUND 10 Audio Input(4EA) PC Audio, Component, AV(2EA) L/R Input 4 System : PAL, SECAM, NTSC, PALSystem : PAL, SECAM, NTSC, PAL60 UK,France, Germany, Spain, Sweden, Finland, Italy Remark

ADJUSTMENT INSTRUCTIONS

1. Application Object
These instructions are applied to all of the 42 PLASMA TV, PD74A Chassis. Each PCB assembly must be checked by check JIG set. (Because power PCB Assembly damages to PDP Module, especially be careful)

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 255C of temperature and 6510% of relative humidity if there is no specific designation. (4) The input voltage of the receiver must keep 100-240V~, 50/60Hz. (5) Before adjustment, execute Heat-Run for 30 minutes at RF no signal.
5. POWER PCB Assy Voltage Adjustments (Va, Vs Voltage adjustments)
5-1. Test Equipment : D.M.M. 1EA 5-2.Connection Diagram for Measuring

: refer to Fig.1

5-3. 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 P805, connect - terminal to GND pin of P805. 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)

3. Channel memory Setting Method
: You can set channel memory by R/C for adjustment. 1) Press ADJ key of Adjust Remote Controller.(P/N:105-210M) 2) Select Channel Recover by using D/E(CH +/-) key, and press VOL +. 3) The set is turned off automatically. 4) Press power key of Adjust Remote Controller.

(2) Vs Adjustment

1) Connect + terminal of D.M.M to Vs pin of P805, connect terminal to GND pin of P805. 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)
<42 EAY3292701> (Fig.1) Connection diagram of power adjustment for measuring
4. PCMCIA CARD Checking Method
: You must adjust DTV ##(Scrambled) Channel and insert PCMCIA CARD to socket. 1) If PCMCIA CARD works normally, normal signals display on screen. But it works abnormally, No CA module words display on screen.
6. EDID (The Extended Display Identification Data)/ DDC (Display Data Channel) download
* Caution (1) Use the proper signal cable for EDID Download. - Analog EDID : Pin3 exists. - Digital EDID : Pin3 exists. (2) Never connect HDMI & DVI-D & DVI-A Cable at the same time. (3) Use the proper cables below for EDID Writing. For RGB EDID D-sub to D-sub For HDMI EDID DVI-D to HDMI or HDMI to HDMI
6-4. Sequence of Adjustment

- EDID Download

1) Init the data.
2) Load the EDID data.(Open File).

[Analog file] (for RGB)

Open File
[Digital file] (for HDMI)

6-1. EDID Date

Item Manufacturer ID Version Revision Condition GSM Digital : 1 Digital : 3 Hex Data 1E6D 01 03
3) Set the S/W as below. 4) Push the Write Data & Verifybutton. And confirm Yes. 5) If the writing is finished, you will see the OK message. 6) If TV has two HDMI, you must download two times for each HDMI.

6-2. Setting of device

(Fig. 2) Connection Diagram of DDC download
6-3. 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.

- EDID DATA

1) Analog RGB(128Byte).

-> Product ID Model Name Product ID Product ID Dec Hex 9CB6 9CB6 EDID table B69C B69C

42PT85 50PT85 2. 3.

2) HDMI1 RGB(256Byte).
-> Serial No : Controlled on production line -> Month, Year : Controlled on production line ex) Week : '03' => '03' Year : '2006' => '10' -> Model Name(Hex): Hex Data 000000FC003432505438350A202020202020 000000FC003530505438350A202020202020 -1, -2 -> Checksum : Changeable by total -8A -2 C2 C3 -1 CC CC -2 F2 BC

Model Name 42PT85-ZB 50PT85-ZB 5. -1, -2, EDID data Model Name 42PT85-ZB 50PT85-ZB

7. ADC Calibration

ADC RF/AV/S-VIDEO Component RGB-PC
=> Detail EDID Options are below( , , , , -1, -2, -1, -2) 3) HDMI1 RGB(256Byte).
MSPG925FS PAL INPUT SELECT AV3
Model:215 (720P) Model: 60 Pattern:65 (1024*768 60Hz) Pattern: 65
Model: 202 (PAL-BGDHI) 720P/50Hz Pattern: 65 PAL 7 Color Bar 7 Color Bar
- System control RS-232 Host should be PC for adjustment. - Before AV ADC Calibration, execute the Panel size selection
=> Detail EDID Options are below( , , , , -1, -2, -1, -2)
8. Auto RF/AV/S-VIDEO Color Balance

8-1. Requirement

4) Press the G(Vol. +) key to operate the set, then it becomes automatically.
This AV color balance adjustment should be performed before white Balance Adjustment.

8-2. Required Equipment

1) Remote controller for adjustment. 2) MSPG-925FS Pattern Generator (Which has Video Signal: 7 Color Bar Pattern shown in Fig.3). (1) Model: 202 / Pattern: 65 - Models use PAL-BGDHI. (composite signal) (Fig.6) Color Bar signal 5) Auto-RGB OK means the adjustment is completed.

10. Adjustment of RGB

10-1. Requirement
8-3. Method of Auto RF/AV/S-VIDEO Color Balance(PAL_BGDHI)
1) Input the PAL Video signal 7 color Bar (MSPG-925FS Model : 202, pattern : 65) signal into AV3. 2) Set the PSM to Dynamic mode in the Picture menu. 3) Press INSTART key on R/C for adjustment.

10-2. Required Equipment

1) Remote controller for adjustment. 2) MSPG-925FS Pattern Generator (Which has Video Signal: 7 Color Bar Pattern shown in Fig.7). (1) Model: 3 / Pattern: 65 - Models use RGB
10-3. Method of Auto RGB Color Balance
(Fig.3) Color Bar signal 4) Press the G(Vol. +) key operate to set, then it becomes automatically. 1) Input the PC 1024x768 @ 60Hz 7 color bar (MSPG-925FS, Model : 3, Pattern : 65) signal into RGB.(using D-sub to Dsub cable) 2) Set the PSM to Dynamic mode in Picture menu. 3) Press the IN-START key on R/C for adjustment.
(Fig.4) Color Bar signal 5) Auto-RGB OK means completed adjustment.
(Fig.7) Color Bar signal 4) Press the G(Vol. +) key operate to set , then it becomes automatically.
9. Adjustment of Component

9-1. Requirement

This AV color balance adjustment should be performed before white Balance Adjustment. (Fig.8) Color Bar signal 5) Auto-RGB OK means adjustment is completed.

9-2. Required Equipment

1) Remote controller for adjustment. 2) MSPG-925FS Pattern Generator (Which has Video Signal: 7 Color Bar Pattern shown in Fig.5). (1) Model: 215 / Pattern: 65 - Models use component.

9-3. Method of Auto Component Color Balance
1) Input the Component 720p/50Hz 7 Color Bar (MSPG925FS Model : 215, pattern : 65) signal into Component. 2) Set the PSM to Dynamic mode in the Picture menu. 3) Press IN-START key on R/C for adjustment.

(Fig.5) Color Bar signal

11. Scart RGB(DVR) Adjustment Mode

11-1. Required Equipment

1) Remote controller for adjustment 2) MSPG-925FS Pattern Generator (Which has Video Signal: 7 Color Bar Pattern shown in Fig.9) (1) Model: 232 / Pattern: 08
12. Adjustment of White Balance

12-1. Required Equipment

(1) Color Analyzer(CA-100+/CH.10) 1) Remote controller of adjustment -> Color Analyzer(CA100+ of same product) : CH 10 2) Auto W/B adjustment instrument.(only for Auto Adjustment) -> AV Pattern Generator.
11-2. Method of Auto Scart RGB(DVB) Balance
1) Input the Video Signal : Color Bar signal into AV1(using Full Scart Cable). 2) Set the PSM to Dynamic mode in Picture menu. 3) Press the IN-START key on R/C for adjustment. Color temperature standards according to CSM and Module. CSM Cool Normal Warm
PLASMA 11000K 9300K 6500K

Remark

White balance adjustment coordinate and color temperature. * PC(for communication through RS-232C) Cool CS-100 0.276 0.283 0.000 CS-100 0.285 0.293 0.000 CS-100 0.313 0.329 0.004 CA-210(CH 10) 0.2760.002 0.2830.002 0.000 CA-210(CH 10) 0.2850.002 0.2930.002 0.000 CA-210(CH 10) 0.3130.002 0.3290.002 0.004

(Fig.9) Color Bar signal

x y uv Medium x y uv Warm x y uv
-> UART Baud rate : 115200 bps * Luminance Y AV : upper 150cd/m2 (Typ : 350cd/m2) -> Applying to Cool, Medium, Warm mode. (Fig.10) Color bar Signal 4) Press the TURBO-PICTURE Key on R/C for adjustment. 5) Press the G(Vol. +) key operate To set , then it becomes automatically.(Fig.7) 6) Scart RGB(DVR) OK means Scart RGB adjustment is completed.
12-2. 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 of White-Balance, the pattern will come out. power supply) and heat-run over 15 minutes.

Full White Pattern

CA-210
Color ANALYZER TYPE : CA-210

RS-232C Communication

(Fig.11) Auto AV(CVBS) Color Balance Test Pattern

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Auto adjustment Map(RS-232C)
Type PD74A Data bit 8 Index R-Gain_Normal G-Gain_Normal B-Gain_Normal R-Gain_Warm G-Gain_Warm B-Gain_Warm R-Gain_Cool G-Gain_Cool B-Gain_Cool R-Offset_Normal G-Offset_Normal B-Offset_Normal R-Offset_Warm G-Offset_Warm B-Offset_Warm R-Offset_Cool G-Offset_Cool B-Offset_Cool Internal Pattern Signal Internal Pattern Signal Internal Pattern Signal Stop bit 1 Parity None Max Value 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80) 128(80)
Baud Rate 115200 Protocol Setting
Cmd 1 Cmd 2 Data Min Value j j j j j j j j j l l l l l l l l l w w w a b c d e f g h i j k l m n o p q r b b b ff 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00) 00(00)
* Color Temperature: Cool, Medium, Warm (1) When R GAIN is set to 80 - Control G GAIN and B GAIN by lowering from 80. (2) When B GAIN is set to 80 - Control R GAIN and G GAIN by lowering from 80. (3) When G GAIN is set to 80 - Control R GAIN and B GAIN by lowering from 80. One of R Gain / G Gain / B Gain should be kept on 80, and adjust other two lower than 80. (When R/G/B GAIN are all 80, it is the FULL DYNAMIC Range of Module).
14. Default Value in Adjustment mode

14-1. Auto Color Balance

<Component> <RGB>
W/B adjustment Start Internal Pattern use W/B adjustment end
12-3. 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(CA100+, CA-210) 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.
(Fig.12) Default Value on OSD

14-2. Write Balance

13. Adjustment of White Balance
(Manual white Balance) One of R Gain/ G Gain/ B Gain should be kept on 80, and others are controlled lowering from 80 (1) press power on of the control R/C, set heat run to white by pressing G and heat run over 15 minutes. (Set: RS-232 Host: PC, Baud Rate: 115200bps, Download: Cortez) 2) Zero Calibrate CA-100+, and when controlling, stick the sensor to the center of PDP module surface. 3) Double click In-start key on Controlling R/C and get in white balance. 4) Set test-pattern on and display inside pattern. Control is carried out on three color temperature, COOL, MEDIUM, WARM. (Control is carried out three times,) 5) When the R/G/B GAIN is 80 on OSD, it is the FULL DYNAMIC Range of the Module. In order to control white balance without the saturation of FULL DYNAMIC Range and DATA, one of R Gain / G Gain / B Gain should be kept on 80, and other two is controlled lowering from 80.

Does the Vs, Va voltage output appear? No 8. Check the Vs, Va voltage output circuit.
Does the VSC low pressure output appear? No 6. Check the VSC low pressure output
7. Check the VSC Vs-ON signal
Does the high tension output voltage occur? Yes
When the Y, Z B/D Module input connector, does Power Board high tension output voltage drop?
When removing the Y B/D Module input connector, does output voltage drop? Yes 10. Check the Z B/D Module output circuit
When removing the Z B/D Module input connector, does output voltage drop?
Yes 9. Check the Power Board Output high tension circuit
Yes 11. Check the Y B/D Module output circuit
Manufactures model passage

- 13 -

1-2. 50 Power Board Structure(EAY32927901)

(1) Pin Layout

(2) Pin Spec
NO 13 Description YH396-03V AC INLET SC101 AC NC AC P800 AC Det RL-ON STBY 5V GND Vs-ON 5V Det M5V-ON STBY 5V GND NC 6V GND 3.4V-ON SMW250-13P SMW250-10P SMW250-12P ANALOG & DIGITAL BOARD P802 19V 19V GND GND 6V GND 3.4V GND 12V GND P803 3.4V 3.4V GND GND 6V 6V GND GND 12V 12V GND GND YH396-04V YH396-10V PDP MODULE P811 5V 5V GND GND P812 Va Va GND GND GND GND NC Vs Vs Vs

- 14 -

2. No Power

(1) Symptom

1) Does not minute discharge at module. 2) Non does not come into the front LED.

(2) Procedure check

No Is the power cord plugged in? Yes No Connect the Cable. Plug in the power cord.
Is the Line Filter and Power Board Cable connected? Yes
Is the appropriate Fuse(F101) on the Power Board? Yes

No Replace the Fuse.

Is the Power Board and 13P of VSC Board Cable connected? Yes

No Connect the Cable.

After removing the cables, connect them to the Power Board(except the SC101 connection cable), and change the AC voltage marking to manual. When ST-BY 5V does not operate, replace the Power Board.

- 15 -

3. Protect Mode
1) After lighting up once, it does not discharge minutely from module. 2) The rely falls.(there is an audible click) 3) The color of the front LED turns from green to red.
Is the Power Board normal ? Yes Is the each connector normal? Yes Is the Y-Board normal? Yes Is the Z-Board normal? Yes Is the X- Board normal? Yes Is the Ctrl Board normal? Yes Is the VSC Board normal? Yes Is the COF of X, Y, Z normal ? No After a COF crisis for each board, check the normal operation. For normal operation, corresponding COF failure means the module should be relaced. No Is the output voltage normal after removing P900, P901 of VSC Board? Yes If it operates normally after removing the P900, P901 : Replace the VSC Board No Is the output voltage normal after removing P1, 2, 4, 9, 10 connectors of the Ctrl-B/D? Yes Replace the X-Board. No Is the output voltage normal after removing P1, 2, 3, 4, 5 connectors of the X-B/D? Yes If the output voltage is normal after removing the P1, P2, P3 : Replace the right X-B/D If the output voltage is normal after removing the P4, P5 : Replace the left X-B/D No Is the appropriate Fuse (FS1, FS2) on Z-B/D? (replace if open) Yes Is the output voltage normal after removing P1 connector of Z-B/D? Yes Replace the Z-Board. No Is the appropriate Fuse(FS101,FS102) on the Y-B/D normal?(Replace if open) Yes Is the output voltage normal after removing P103 connector of Y-B/D? Yes Replace the Y-Board. No After connecting each connector do they operate normally? Yes Replace the connector. No Is the output Low/High voltage normal except for Stand-by 5V? No Replace the Power Board.

- 16 -

4. No Raster
1) No OSD and image occur at screen. 2) It maintains the condition where the front LED is green.
Does minute discharge At Module? No Is the VAVS on? NO Is the Low/High output voltage normal except for stand-by 5V? NO Replace the Power board

Check the PDP Module

Is the LVDC cable normal?
Reconnect the LVDS cable in P1901
Is the IC700(FLI8548) Output normal?

No Replace the VSC.

- 17 -
5. In case of strange screen display in specific modes
5-1. In case of no OSD display
1) LED is green. 2) The minute discharge is continuously accomplished from the module.
No Yes Replace the cable.
Is the LVDS cable normal ?
Is the LVDS cable connected? No

Re-insert the Cable.

Is the VSC Board normal?
Does the FIL8548 IC(IC700) operate? No

Yes Replace the VSC B/D

Replace the FIL8548 IC(IC700)
Is the Ctrl Board of Module normal?

No Replace the Ctrl B/D.

- 18 -
5-2. In case there is no display on the screen in specific modes
1) There is no screen display from a specific input mode (RF, AV, Component, RGB, DVI).
1) Check the all input modes have normal display.
(3) In case of an unusual display in RF mode
Is the Tuner normal? No Is the Tuner Cable connected? No Yes Re-insert the cable No Is the CXA2069Q normal? Block A Yes No Is the FIL8548 normal? Are the input voltage, IIC Communication and HV sync normal? No Replace the IC. No Replace the IC. Replace the Tuner. Yes Are the Input voltage, IIC Communication and CVBS output normal? No
Are the Input voltage, IIC Communication and HV sync normal?
(4) In case of an unusual display in side S-video/ AV mode
Is the Video input of the AV Jack(P1400) normal? Yes No Is the CXA2069Q normal? Yes Same as Block A Are the Input voltage, IIC Communication and HV sync normal? No Replace the IC. No Check the input source

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(5) In case of an unusual display in Component, RGB mode
Are the R,G,B input and H,V Sync of the P1100 normal? Yes Same as Block A No Check the input source
(6) In case of an unusual display in HDMI mode
Is the HDMI002(IC1004) normal? Yes Same as Block A No Are Input voltage, IIC Communication and HV sync normal? No Replace the IC.
(7) In case of an unusual display in SCART1 mode
Is the Video input of the A/V Jack(J1200) normal? Yes Same as Block A No Check the input source
(8) In case of an unusual display in SCART2 mode
Is the Video input of the A/V Jack(J1201) normal? Yes Same as Block A No Check the input source

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6. In case of no sound
1) LED is Green. 2) Screen display appears but there is no sound.
All input(modes) have no sound? YES No No Is the speaker on? YES No No Set speaker on in the menu.
Is there no sound only for HDMI? YES

Download the EDID data

Is the speaker Cable normal?

Check the Speaker Cable.

Is there no sound only for RF? YES
No Check the Tuner IN/OUT Yes
Is there no sound only for AV/component/PC?
Is the output of CXA2069 normal? YES

No Replace the CXA2069

Check the signal after CAX2069 refer to circuit diagram
Is the IC1300 operating normally? YES
Replace the IC1300 (MSP4450)
Is there no sound only for specific? (except HDMI,DTV,RF)
Check the signal before CAX2069 refer to circuit diagram
Is the IC1301 operating normally? YES
Replace the IC1300 (STA335BW)

Replace the VSC B/D

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7. Time shift Mode ( DVR BOARD )
1) Does not work time shift mode. 2) Can not enter to recorded list. 3) Can not record AV/RF.

(2) Follow check

Yes Is time shift mode on?
Are the cables connected? (12pin, 4pin,40pin) No
Is the Power B/D Is the operating normally? Yes Is the Power & Data Cable normally?(P1500, P1501) Yes
Check the power B/D or Power connector(P901)
Change the power and Data Cable
No Is the HDD normally? Yes Yes Check the BU9580KVT IC(IC1504) normally? Yes Check the STI1500 IC(IC100), NEC61151F(IC1600), NEC64015A(IC1901) normally? Yes Change the time shift mode from off to on. No No Change the HDD normally? No Replace the STI5100, NEC61151F, NEC64015A normally? Connect 31pin cable.

- 22 -

8. Time shift sound and Recorded video sound ( DVR BOARD )
1) SOUND does not come out.
Yes MUTE key on? No Is the Sound cable normally? Yes Are power cables connected. No No Connect power cables /power B/D. Connect speak cable Sound normally? No Check the speakers normally? Yes No Check the MSP(IC1300), Audio AMP(1301) normally? Change the ICs normally? Yes Is the 31pin cable(P1501) normally? Yes No Change the speakers. No Connect the Data cable. Turn off the mute key.

Yes Change the VSC B/D.

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9. Recorded video ( DVR BOARD )
1) Can not play the recorded video.
Check the 31pin flat cable normally? Yes Yes Connect the data cable(P1501) Yes1 Yes2 Are the cables connected? (P1500, P15101) No Check the BU9580KVT IC(IC1504) normally? No Check the STI5100 IC(IC100), NEC61151F(IC600), NEC64015A(IC1901) normally? No No Change the HDD normally? Replace the VSC B/D Remove the recorded lists and Record one more time and Play again normally?

Connect.the cable

- 24 -
IDTV DVR Block IDTV DVR Block

RS232_Rx/Tx

TC74LCX RS232_Cortez RS232_ST

Rx0/1,Tx0/1

ST3232C

Cortez Plus

DDRRAM (256MB)
RGB_PC/DTVH/V(RGB) 8 DTV 656 /

RGB (PC/DTV)

Flash(4MB) LVDS_31P STHDMI002 HDMI MUX /

Addr /Data Buffer

SCL/SDA 24LC02 For DDC_RGB PC_Audio

Rx0/1/2/C

PC_Audio HDMI 2 (PC/DTV) Comp

For Hot Plugg -in

SCL/SDA

24LC02

(DVD/DTV)
For DDC_DVI Component In DVR Scart RGB
HY57V161610ET HY57V641620ET HY57V641620ET
- Main CH. Decoding - 3D Comb - 3D De-nt. i - Scaling & FRC - GUI - Audio Delay - CPU
Tx0/1/2/3/C Disp_En SCL/SDA

Logics for CI

FMI BUS 16bit
TC74LCX157 LRCK/MCK I 2S SCK/SDA

S29JL064H70TFI010

ATA To SATA Converter $2

Flash(8MB)

LMI BUS 16bit

DTV 656

DDR SDRAM(64MB)
LGE Internal Use Only L_SPK_out R_SPK_out

DTV_out (CVBS/L/R)

SCK/SDA I 2S

HY5DU121622-D43

DTV I2S
Copyright 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes $0.5
74LCX245 74LCX373 74LCX373 74LCX541

Scart1

V_out1 Y_in1

24.576M I2S 27MHz VCXO

Scart_RGB / FB TV Vout TVL/R out Main V or YC
SDRAM(2MB) 16bit SDRAM(8MB * 2 ) 32bit

74LCX32

74LCX08 74LVC14
AVin1 (CVBS/L/R/Scart_ID) MNT_out (CVBS/L/R) uPD64015 Video 656 Comp Decoder

CI SLOT

BLOCK DIAGRAM
- 25 I 2C Sub V or YC , DVR V or YC DVR LR

Scart2

CS5331

STm5100

uPD61151 MPEG Encoder
PCMCIA Power Switch TPS2011 ?

DTV_out(CVBS/L/R)

CXA2069Q A/V Switch

Mpenc_TS

CI TS MUX
74LCX541 74LCX541 Tuner TS1
TU_Main SIF A/D Universal TV Vout

AV_LR TV_L/Rout

DVR Option
MUX 74LCX541 74LCX541 74LCX157

Tuner TS

74LCX541 74LCX541 74LCX157 Tuner TS0
Digital only Tuner TDFG-G105P
A/D Univesal Tuner TDFC-G106P

SPDIF out

DTV I2S HDMI I2S

I 2C ST SPDIF

TC74LCX157

MSP SPDIF

I2C_0 24C256
TP Dec. Mpeg Decoder Audio Dec.
ST-Connect (20pin) 27MHz 32.768KHz

RS232_ST

74LVC14 SYS RST DTV Reset From CORTEZ
Side-AV B D Comp_LRin PC_Audio AV_LR

TV_L/Rout

MSP4450K I 2C Audio SW & LRCK/MCK Tone Control STA333W

EXPLODED VIEW

601 602

305 560

208 201

240 205

A2 A502
Copyright2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 26 -

EXPLODED VIEW PARTS LIST

901 A2 A21

The components identified by mark critical for safety. Replace only with part number specified.

Part No.

5900904001A EAB33775101 EAB33893101 EAJ38568401 EBR35959201 EBR37397801 EBR37398001 EBR35855501 EBR35856701 EBR35856201 EBR37284101 EBR37284601 AJJ31680703 AJJ31680704 ABJ31087704 ADV31044301 MBH32566301 AJJ31044702 AJJ31044802 AJJ31044902 AJJ31045002 MBG32788501 ACQ31044404 AGU30996806 AGU30996910 EBR38879912 EBT38852912 EBR37674301 EBR37674901 EAY32957901 EAM35012703 EBT38811812 EBR37673801 ABA30998702 MGJ32323501 AAN31593102 MCK32604801 MKJ32022814 3550V00590A

Descriptions

Fan Module, 1.7KRPM DC 12V 250UA 3W 50HZ 1.5M3 per MIN 396X60.2X108.3MM DONGYANG CHEMICAL Speaker, Full Range EN1562C-6712 ND 10W 8OHM 82DB 100HZ 193.5 X 42 X 39.9 LUG KOREA TOPTONE Speaker, Tweeter EN10D-6714 ND 10W 8OHM 82DB 0HZ 68 X 23 X 22.7 LUG KOREA TOPTONE PDP, Module-XGA PDP50X40B36.ASLGB XGA 50INCH 1365X768 16/9 PDP DIVISION Hand Insert PCB Assembly, CTRL ASSY HAND INSERT 50 X4A 4006W & 256CH CTRL PDP DIVISION Hand Insert PCB Assembly, YDRV ASSY HAND INSERT 50 X4A Reduce Size. (6.5mm) AU. YDRVT PDP DIVISION Hand Insert PCB Assembly, YDRV ASSY HAND INSERT 50 X4A Reduce Size (6.5mm). AU. YDRVB PDP DIVISION Hand Insert PCB Assembly, XRLT ASSY HAND INSERT 50 X4A 256CH PDP DIVISION Hand Insert PCB Assembly, XRCT ASSY HAND INSERT 50 X4A 256CH PDP DIVISION Hand Insert PCB Assembly, XRRT ASSY HAND INSERT 50 X4A 256CH PDP DIVISION Hand Insert PCB Assembly, YSUS ASSY HAND INSERT 50 X4A Change ER Coil. 2L. OSP PDP DIVISION Hand Insert PCB Assembly, ZSUS ASSY HAND INSERT 50 X4A Change ER Coil. 2L. OSP PDP DIVISION Supporter Assembly, 50PB4, SUPP MODULE VERTICAL ASSY RIGHT,CSKD Supporter Assembly, 50PB4, SUPP MODULE VERTICAL ASSY LEFT,CSKD Cabinet Assembly, 50PB4DT-ZB EUROPASS3 WITH DVR,(CSKD) 50 CABINET ASSY Film Sheet Frame Assembly, 50PB4 LG 50 Front Frame Assy Cabinet, MOLD ABS AF-342 50PB4 ABS CABINET Film Sheet Supporter Assembly, 50PB4 SUPP_FILTER TOP ASSY, CSKD Supporter Assembly, 50PB4 SUPP_FILTER BOTTOM ASSY, CSKD Supporter Assembly, 50PB4 SUPP_FILTER RIGHT ASSY, CSKD Supporter Assembly, 50PB4 SUPP_FILTER LEFT ASSY, CSKD Button, MOLD ABS CONTROL PC5/PB4 ABS 8KEY NON Cover Assembly, Rear 50PB4 WITH DVR 50 Back Cover Assy (SKD) Plate Assembly, AV Plate Tuner Bottom Assy (UROPASS3, DVR). FOR 42/50/60PB4 CSKD Plate Assembly, REAR AV Plate Cover Assy, LARGE, 42/50PT85-ZB, EUROPASS 3 CKD Hand Insert PCB Assembly, MAIN2 M.I PD74A 50PT85-ZB. CKD 50PT85 MAIN2 HAND INSERT Chassis Assembly, SUB PD74A CKD 50PT85 SUB PD74A HDD assembly Hand Insert PCB Assembly, SUB M.I PD74A 42PT85-ZB. 42PT85-ZB CONTROL ASSY HAND INSERT Hand Insert PCB Assembly, SUB M.I PD74A 42PT85-ZB. 42PT85-ZB IR ASSY HAND INSERT SMPS, AC/DC YPSU-J017A 100VTO240V 530W 50 TO 60HZ UL/CE/TUV 50INCH PDP XPOWER LGIT PSU Filter, AC Line IF2-N06CEWL2 5.3mH 250VAC 6A 0.22uF 1000pF VDE/CSA/K/CCC 450/130MM CORE ADDTION Chassis Assembly, SUB PD74A CKD 50PT85-ZB SIDE AV ASSY Hand Insert PCB Assembly, SUB M.I PD74A 42PT85-ZB. 42PT85-ZB SIDE-AB HAND INSERT Bracket Assembly, AV PY30 AB E3_SIDE AV BRACKET ASSY, EUROPASS, NON USB, WITH S-VIDEO Plate, Shield PRESS AL 1.0 SHIELD AL E3 PY30 SHIELD,SIDE AV Base Assembly, STAND 50PC5 NON 50PC5 FIX STAND FOR SKD Cover, MOLD ABS 42PC5 ABS CABLE MANAGEMENT Remote Controller, COMPLEX LD73A 26LC4 EUROPASS_DVR Cover, MOLD ABS 50PC3DD-UE.AUSRSHR ABS

FILTERs & INDUCTORs

F1 L100 L101 L102 L103 L104 L105 L106 L108 L1101 L1102 L1104 L1105 L1106 L1107 L1108 L1109 L1205 L1206 L1207 L1208 L1211 L1212 L1215 L1223 L1301 L1302 L1303 L1309 L1310 L1311 L1312 L1313 L1314 L1315 L1401 L1403 L1503 6210VH0004A 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001L 6210TCE001L 6210TCE001G 6210TCE001P 6210TCE001P 6210TCE001P 6210TCE001P 6210TCE001P 6210TCE001G 6210TCE001Z 6210TCE001Z 6210TCE001Z 6210TCE001L 6210TCE001L 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001S 6210TCE001S 6210TCE001S 6210TCE001S 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G Filter, 6210VH0004A 100OHM 30MM 13MM 34MM Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HB-1T2012-102JT 1000OHM 2X1.25X1M Filter, HB-1T2012-102JT 1000OHM 2X1.25X1M Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HB-1S2012-121JT(H:1mm) 120OHM 2X1 Filter, HB-1S2012-121JT(H:1mm) 120OHM 2X1 Filter, HB-1S2012-121JT(H:1mm) 120OHM 2X1 Filter, HB-1S2012-121JT(H:1mm) 120OHM 2X1 Filter, HB-1S2012-121JT(H:1mm) 120OHM 2X1 Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M2012-600JT 60OHM 2X1.25X1MM Filter, HH-1M2012-600JT 60OHM 2X1.25X1MM Filter, HH-1M2012-600JT 60OHM 2X1.25X1MM Filter, HB-1T2012-102JT 1000OHM 2X1.25X1M Filter, HB-1T2012-102JT 1000OHM 2X1.25X1M Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HU-1M2012-121 120OHM 2X1.25X1MM S Filter, HU-1M2012-121 120OHM 2X1.25X1MM S Filter, HU-1M2012-121 120OHM 2X1.25X1MM S Filter, HU-1M2012-121 120OHM 2X1.25X1MM S Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1.