Lenovo L172 Service Manual page 34

17" LCD Color Monitor Lenovo L172
8.2.3 Keypad Board
OSD is unstable or not working
N
Connect Key Pad Board
Is Key Pad Board connecting normally?
Y
N
Replace Button Switch
Is Button Switch normally?
Y
N
Replace Key Pad Board
Is Key Pad Board normally?
Y
Check Main Board
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