AOC 919SWA manual Trouble Shooting, No power

19" LCD Color Monitor

9.2Trouble Shooting

9.2.1 Main Board

1.NO SCREEN APPEAR

No power

No power

Press power key and look if the picture is normal

NG

Please reinsert and make sure the AC of 100-240 is normal

NG

OK

Measure U404 Vout=3.3V

U405 Vout=1.8V

NG

OK

X401 oscillate waveforms are normal

NG

OK

Replace U401

AOC 919Swa

Reinsert or check the power section

Replace

U404,U405,CN404

Replace X401

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