Dell E228WFP Service Manual page 47

22"LCD Color Monitor Dell E228WFP
9.2.3 Keypad Board
OSD is unstable or not working
N
Is Key Pad Board connecting normally? Connect Key Pad Board
Y
N
Replace Button Switch
Is Button Switch normally?
Y
N
Is Key Pad Board normally?
Replace Key Pad Board
Y
Check Main Board
47