LG GS290 - Page 64

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Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics 66/136 LGE Property
1. Don’t use Heat Gun
2. Replace main PCB
STAR
T
“PWRON” signal
Check 3 pin of Q201
“_RESET” signal
Check 8 pin of U203
Check the all LDO’s
output
Is it correct?
Is the 26MHz
clock From X500
signal correct?
Replace main PCB
Check the RPWRON,
replace Q201
Check solder
U203 or replace it
Check solder
U202 or replace it
Check solder X500
or replace it
Check 1 pin of X500
Or Check 11 pin of
U500
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Q201
T
P1
Change Battery or
Check Battery
connector
Battery Voltage,
higher than 3.35V ?
No
U203
U202
U500
11pin of U500
Change Battery Connector
T
P2
1pin of X500
X500