Casper 19CSPR Service Manual page 37

19" LCD Color Monitor
8.2.3 Key Board
Is Key Pad Board connecting normally?
OSD is unstable or not working
OK
Is Button Switch normally?
OK
Is Key Pad Board Normally?
OK
Check Main Board
NG
Connect Key Pad Board
NG
Replace Button Switch
NG
Replace Key Pad Board
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Casper 19CSPR