LG -A100 Service Manual page 71

CHECKING FLOW
START
Is the LCD
Backlight OK?
YES
Check the soldering
Condition of CN401
YES
Check the voltage at
TP2= 1.8V ?
YES
Check the voltage
at each pin of TP3 changes
low to high?
YES
Does LCD Work
Properly?
YES
LCD working well !
LGE Internal Use Only
NO
Is the voltage of
TP1 is around 0.9V?
YES
Check the soldering
Condition of CN401
Replace LCD module
NO
NO
NO
NO
NO
NO
YES
Re-download or
Replace U205
Re-solder LCD Module
Re-solder R427
Re-solder resister connected faulty pin.
(R410~R413,R419~R422,R429,R431,R432,R434)
Replace LCD Module
- 71 - Copyright © 011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Re-solder LCD Module
Only for training and service purposes