LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 67 -
14pin of U401
START
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
Check the
RPWRON,
replace Q201
Check solder
U203 or replace it
Check solder
U202 or replace it
Check solder X400, U401
or replace it
Check 3 pin of X400
Or Check 14 pin of U401
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Connect power
supply to the DUT
Vbat = over 3.35V
Q201
TP1
TP2
X400
U203
U202
3pin of X400
U401
Содержание KF350
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