LG KS660 Service Manual page 67

4. TROUBLE SHOOTING
START
Connect power
supply to the DUT
Vbat = over 3.35V
"PWRON" signal
Check R222
connected Q200
"_RESET" signal
Check 5 pin of U207
Check the all LDO's
output
Is it correct?
Is the 26MHz
clock From X400
signal correct?
Replace main PCB
LGE Internal Use Only
Yes
No
Yes
No
Yes
No
Yes
No
Yes
X400
26MHz
U402
- 68 -
TP1
Q200
Check the
RPWRON,
replace Q200
Check solder
U207 or replace it
Check solder
U300 or replace it
Check solder X400
or replace it
Check 3 pin of X400
Or Check 11 pin of U402
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP2
U207
U300