LG KF350 Service Manual page 66

START
Connect power
supply to the DUT
Vbat = over 3.35V
PWRON s ignal
Check 3 pin of Q201
_ RESET s ignal
Check 5 pin of U203
Check the all LDO s
output
Is it correct?
Is the 26MHz
clock From U401
signal correct?
Replace main PCB
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Yes
No
Yes
No
Yes
No
U202 or replace it
Yes
No
Yes
X400
U401
4. TROUBLE SHOOTING
TP1
Q201
Check the
RPWRON,
replace Q201
Check solder
U203 or replace it
Check solder
Check solder X400, U401
or replace it
Check 3 pin of X400
Or Check 14 pin of U401
- 67 -
TP2
U203
U202
14pin of U401
3pin of X400
LGE Internal Use Only