LG KS360 Service Manual page 67

5. Trouble shooting
START
Connect power
supply to the DUT
Vbat = over 3.35V
Yes
Check
ìPWRONî si gnal of
TP1 2.0V
Check R112 when
push the power key
Check
ìPWRONî signal of
TP1 0V
Yes
Check the all LDOís
output
Is it correct?
Is the 26MHz
clock from TP2
X100 of U102 ?
Replace main PCB
LGE Internal Use Only
No
BACKUP Battery
Yes
No
Replace Dome Switch
Yes
No
No
No
Check the
Check solder R112
or
(PWR key)
Check solder
Q201
Check solder whole LDO
parts or replace it
Check solder
Replace X-TAL
Copyright © 2008 LG Electronics. Inc. All right reserved.
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PWR key
TP1
Q201
TP2
X100
Only for training and service purposes