LG S75A1-D - 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 3.3 V?
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
Replace LCD.
Check adaptor.
Replace IC302.
Replace IC301.
Replace IC309.
Replace IC308.
Replace IC601.
Pin4 of CN400
should be 5 V.
Pin3 of IC302
should be 3.7 V.
Pin2 of IC301
should be 5.3 V.
Pin3 of IC309
should be 25 V.
Does IC308 work?
L312 should be 25 V.
Pin2 of IC601
should be 25 V.
YES
YES
YES
YES
YES
YES
1. POWER / MICOM / LCD