HP L1906 - Key Board Troubleshooting

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