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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
5. TROUBLE SHOOTING
START
Check
“PWRON” signal of
TP1
Î
2.0V
Check Combination
CN101 of Key PCB
when push the
power key
Check
“PWRON” signal of
TP1
Î
0V
Check the
BACKUP Battery
Check Combination
CN101
or
Replace CN101
(Key PCB Connector)
Check solder
Q401
Yes
Yes
Yes
Yes
No
No
No
No
Connect power
supply to the DUT
Vbat = over 3.35V
Check the all LDO’s
output
Is it correct?
Check solder whole LDO
parts or replace it
Replace main PCB
Is the 26MHz
clock from
TP2
X101 of U104 ?
Check solder
Replace X-TAL
No