TROUBLESHOOTING GUIDE
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Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK IC101
NO
NO
NO
4PIN OF JK300( 12V)
CHECK ADAPTER AND FIND OUT A
SHORT POINT AS OPENING EACH
POWER LINE
CHECK IC302 PIN2( 3.3V)
CHECK REGULATOR AND FIND
OUT A SHORT POINT AS OPENING
EACH POWER LINE
CHECK POWER (3.3V) AND I2C
LINE OF CONTROL ASSEMBY
CHECK ADAPTER
INPUT VOLTAGE
4PIN OF JK300( 12V)
CHECK IC301
PIN2 (1.8V) AND
CHECK IC302
PIN2(3.3V)
CHECK CONTROL
ASSEMBLY OPERATION
YES
YES
YES
NO
CHECK CRYSTAL( X101)
CHECK PULSE OF IC101
P25, P26
YES
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