AOC L42W781HS Service Manual page 28

42‟‟ LCD TV
5.5. Key Board
OSD is unstable or not working
Is Key Pad Board connecting normally?
Is Button Switch normally?
Is Key Pad Board Normally?
Y
Y
Y
Check Main Board
N
Connect Key Pad Board
N
Replace Button Switch
N
Replace Key Pad Board
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AOC L42W781HS