LG FLATRON E2040S - TROUBLESHOOTING: NO POWER; POWER INDICATOR OFF DIAGNOSTICS; VOLTAGE AND OSCILLATOR CHECKS

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TROUBLESHOOTING GUIDE
No Power
(Power Indicator Off)
Please reinsert and
make sure the AC of
100-240V is normal
Measure
U701 PIN2=3.3V
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Check the Adapter/Inverter
section
Check CN702 or replace
U701
NO
NO
YES
YES
1. NO POWER
Check X401 oscillate
waveforms are normal
Replace X401
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Replace U401
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NO
YES