Asus VW221D Service Manual page 41

22" LCD Color Monitor
8.2.3 Key Board
Is Key Pad Board connecting normally?
OSD is unstable or not working
Y
Is Button Switch normally?
Y
Is Key Pad Board normally?
Y
Check Main Board
ASUS VW221D&VW221DE&VW221S
N
Connect Key Pad Board
N
N
41
Replace Button Switch
Replace Key Pad Board