HP 2009M Service Manual page 37

20" LCD Color Monitor
9.2.3 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
37
HP 2009M&2009F
Connect Key Board
Replace Button Switch
Replace Key Board