Main Lcd Trouble - LG GW520 Service Manual

5. Trouble shooting

5.13 Main LCD Trouble

Checking Flow Checking Flow
Start Start
Press END Key Press END Key
to turn on the power ON to turn on the power ON
Is the circuit powered on? Is the circuit powered on?
YES YES
Reconnect FPCB. Reconnect FPCB.
LCD work well? LCD work well?
END END
LGE Internal Use Only
NO NO
Follow the Power ON Follow the Power ON
NO NO
Is the level at C219 Is the level at C219
YES YES
Check control signal Check control signal
YES YES
Check soldering of CN400, Check soldering of CN400,
CN700, CN702, CN801 CN700, CN702, CN801
YES YES
Reconnect LCD Module. Reconnect LCD Module.
GW520 service manual
Trouble shooting Trouble shooting
NO NO
2.85V? 2.85V?
Check TP1 Check TP1
YES YES
NO NO
and data. and data.
YES YES
NO NO
YES YES
NO NO
LCD work well? LCD work well?
- 96 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Change U200 Change U200
Change the main board Change the main board
Resolder connector Resolder connector
Change the slide key PCB Change the slide key PCB
Or LCD Or LCD
Only for training and service purposes