LG GD510 Service Manual page 57

5. Trouble shooting
GD510 Operational Description
START
Battery Voltage,
Higher than 3.35V ?
Check 44Pin (CN502) Connector
Combination then Power ON
"PWRON" signal
Check 'TP3 of Q1
"_RESET" signal
Check 5 pin of U203
Check the all LDO's
output
Is it correct?
Is the 26MHz
clock From X601
signal correct?
Replace main PCB
LG Electronics
LGE Internal Use Only
No
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Yes
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Change Battery
or
Check Battery
connector
Check the
RPWRON,
Replace Q1
Check solder
U203or replace it
Check solder
U300 or replace it
Check solder
X601
or replace it
Check 3 pin of
X601
Or Check 11 pin
of U602
- 58 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Revision A
C3 Q1
U203
X600
14pin of U601
U602
1pin of X601
LGE Property
Only for training and service purposes
U300