LG LAS855M - Electrical Troubleshooting Guide

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