AOC 931SW series - Trouble treatment; Trouble Shooting

Service Manual AOC 931SW+
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8.Trouble treatment
8.1 Maintainability Requirement
1. Voltmeter. & digital multimeter
2. Oscilloscope.
3. Pattern Generator.
4. DDC Tool with Compatible Computer.
5. Alignment Tool.
6. LCD Color Analyzer.
7. Service Manual.
8. User Manual.
9. repair tools etc
8.2 Trouble Shooting
Main Board---
No Power
No power
Press power key and look if
the picture is normal
Please reinsert and make sure the AC
100-240V is normal
?
Reinsert or check the power section
Check 5V-CN404, 3.3V-U404-2;
1.8V-Q409/Q410,Panel-Vcc-Q405
Check X401 waveform
Replace U402/U401
Re
p
lace X401
OK
NG
Check&replace
CN404,U404,Q409,Q410,Q405
NG
NG
NG
OK
OK
Check flow chart
For the no power