Acer AT2230 - Chapter 5 Trouble Shooting

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Trouble Shooting
No picture (LED orange)
Chapter 5
Change key board/IR board
Check U401 Change U401
Check I
2
C bus
Check key board/IR board
Check I
2
C communication
No picture
OK
NG
OK
OK
NG
Check 24V power supply
OK
Check the power supply circuit
NG
NG
Check main board Standby power supply
Change U707
OK
NG