LG GS290 Service Manual page 64

GS290 Operational Description
START
Battery Voltage,
higher than 3.35V ?
"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
Change Battery Connector
1. Don't use Heat Gun
2. Replace main PCB
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Yes
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Change Battery or
Check Battery
connector
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
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4. TROUBLE SHOOTING
Revision B
TP1
Q201
11pin of U500
X500
U500
1pin of X500
LGE Property
LGE Internal Use Only
TP2
U203
U202