Hanns.G HSD HG191D Service Manual page 41

19" LCD Color Monitor
8.2.3 Key Board
OSD is unstable or not working
Is Keypad board connecting normally?
Is Button Switch normally?
Is Keypad board normally?
OK
OK
OK
Check main board
NG
NG
NG
41
HSD HG191D
Connect Keypad Board
Replace Button Switch
Replace Keypad Board