Hyundai HLCD-A20W4 Service Manual page 24

20" LCD TV
6. 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
24
Hyundai HLCD-A20W4