LG 50PG20 Series Manuale utente

- 11 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

- 12 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

Power-Up Boot Fail Trouble Shooting

Check P701 All

Voltage Level (16V, 5V)

Check Power connector

OK ? Replace Power board

Check IC706 #2 Pin

Voltage Level 2.6V

Replace IC706 &

Recheck

Check X100 Clock

12MHz Replace 100

Replace IC105 Flash Memory

Check Q706 Output

Voltage Level (5V) Replace Q801

- 13 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

- 14 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

No OSD Trouble Shooting

Check P302

#33(TXAC-) , #32(TXAC+) ,

#17(TXBC-) , #16(TXBC+)

Maybe Mstar has problems

Check LVDS Cable

Check PDP Module

Control board

Refer to Module CAS

Replace Cable

Check PDPVs,Va Voltage

Module 5V Replace Power

Check P701Disp_EN,

VaVs ON, 5V_MNT Check GPIO Path

- 15 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

No OSD Trouble Shooting (Module Power Sequence)

Normal Display

Vcc

(5V)

DISPEN

TVaR

TVsR

TOn

TVaF

TVsF

TOff

☞1)

Power_on

3 Sec

Power_off

3 Sec

Min

100ms

Min.

2Frame (Recommend: 2 sec)

msec50090Falling Time of Vs (90% to 10%)TVsF

msec2000600

Time interval between 90% of Vcc and 90% of Vs

when Power On

Ton +

TVsR

msec800100Rising Time of Vs (10% to 90%)TVsR

msec30050Falling Time of Va (90% to 10%)TVaF

msec30010Rising Time of Va (10% to 90%)TVaR

msec-20

Time interval between 10% of Vs and 90% of Vcc

when Power Off

TOff

msec-500

Time interval between 90% of Vcc and 10% of Vs

when Power On

TOn

unitMax.Min.DescriptionSymbol

- 16 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

Module Control Trouble Shooting

Check the PDP Module Control

Board Replace Module Control Board

Check the IIC To II C Test

- Debug Menu IIC Test

Remove R330, R334

Check each IC sharing

IIC channel

Check P302 SCL,SDA line SCL,SDA

line R330, R334 Check Signal

SCL (continue)

SDA (continue)

ACK

By Slave

9 1

ACK

By Slave

Command Data

for Addr Stop

By Master

SCL 8

SDA 00

111 A7W

Start

Master

Chip ID Address Byte

(0x1C) ACK

By Slave

19 1

A6 A1 A0

Command Address

Addr=A[7:0]

Write

only

Master : Image Board

Slave :PDP Module

- 17 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

- 18 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

Digital TV Video Trouble Shooting

Check RF Cable

Check TP Clock, Data, Sync

R440, R441, R442 Maybe Tuner(TU400) has problems

Check Mstar LVDS output

#33(TXAC-) , #32(TXAC+) ,

#17(TXBC-) , #16(TXBC+)

Check Tuner 5V Power

IC703 #5 Pin Replace IC703

Maybe Mstar(IC100) has problems

Check LD400 color Bad Tuner. Replace Tuner.

None

Yellow --> none

Check Demodulator Input Clock

X400 (25MHz) Replace it

Check PDP Module

Control board

Refer to Module CAS

- 19 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

- 20 -

Only for training and service purposes

LGE Internal Use Only

TROUBLE SHOOTING GUIDE

Analog TV Video Trouble Shooting

Check RF Cable

Check CVBS signal

TU400 #16 Pin Maybe Tuner(TU400) has problems

Check CVBS signal

C112

Check Tuner 5V Power

IC703 #5 Pin Replace it

Replace it

Maybe Mstar(IC100) has problems

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