Electrical Troubleshooting Guide; Power / Micom / Lcd - LG LAS855M Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER / MICOM / LCD

Does the LED
blinking?
NO
Is L100
Voltage 3.4 VA?
NO
Pin7 of IC309
should be 25 VA.
NO
Pin7 of IC601
should be 25 VA.
NO
Check adaptor.
YES
Is R141
low state?
Pin4 of CN400
should be 5 V.
Pin1 of IC301
should be 5.1 VA.
Does IC304 work?
L312 should be 25 VA.
YES
Replace micom (IC100).
YES
Replace IC309.
YES
Replace IC601.
2-22
YES
NO
YES
NO
YES
NO
YES
NO
Replace micom (IC100).
Replace LCD.
Replace IC301.
Replace IC304.