3-19
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
MAIN PART
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
No power on
by ADAPTOR
A
Replace ADAPTOR
NO
YES
1. POWER (DC-DC CONVERTER) CIRCUIT
A. POWER
Is ADAPTOR
out 12V
Replace D606
NO
NO
YES
YES
Is D606 OK.
Replace U204
Replace U401
Replace U704
No +3.3V
No +5V
No LCD power
No +1.8V
YES
YES
Is U204
3.3V OK?
NO
Replace U401
Is U401
3.3V OK?
YES
No power on
by BATTERY
A
Replace BATTERY
NO
YES
Is
BATTERY OK?
YES
A