LG KP500 - Operational Precautions

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5. Trouble shooting
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Only for training and service purposes
START
ìPWRONî signal
Check 3 pin of U203
(High
Low)
ì_RESETî signal
Check 5 pin of U204
Check the all LDOís
output
Is it correct?
Replace main PCB
Check the
RPWRON,
replace U203
Check solder
U204 or replace i
t
Check solder
U300 or replace i
t
Check solder X600
or replace it
Check 1 pin of X600
Or Check C638 of U601
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Connect power
supply to the DUT
Vbat = over 3.35V
TP1
U203
TP2
U204
U300
U601
1 Pin X600
Is the 26MHz
clock From X600
signal correct?
C638 of U601