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