LG KS660 - Page 67

- 68 -
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Only for training and service purposes
4. TROUBLE SHOOTING
START
“PWRON” signal
Check R222
connected Q200
“_RESET” signal
Check 5 pin of U207
Check the all LDO’s
output
Is it correct?
Replace main PCB
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
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Connect power
supply to the DUT
Vbat = over 3.35V
Q200
TP1
Is the 26MHz
clock From X400
signal correct?
U207
U300
26MHz
U402
TP2
X
400