AOC HP L1906 Service Manual page 38

19" LCD Color Monitor
9.2.3 Key Board
OSD is unstable or not working
Is Key Pad Board connecting normally?
Is Button Switch normally?
Is Key Pad Board Normally?
OK
OK
OK
Check Main Board
NG
Connect Key Pad Board
NG
Replace Button Switch
NG
Replace Key Pad Board
38
HP L1906