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Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
LG Electronics
68/147
LGE Property
1. Don’t use Heat Gun
2. Replace main PCB
START
“PWRON” signal
Check 3 pin of Q201
“_RESET” signal
Check 5 pin of U200
Check the all LDO’s
output
Is it correct?
Is the 26MHz
clock From X501
signal correct?
Replace main PCB
Check the PWRON,
replace Q201
Check solder
U200 or replace it
Check solder
U202 or replace it
Check solder X501
or replace it
Check 1 pin of X501
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Q201
TP1
Change Battery or
Check Battery
connector
Battery Voltage,
higher than 3.35V ?
No
U202
Change Battery Connector
1pin of X501
U200
TP2
Is it correct?