Haier HL42XD1 Service Manual page 21

42 LCD TV
Key Board
OSD is unstable or not working
Is Key Pad Board connecting normally?
Is Button Switch normally?
Is Key Pad Board Normally?
Check Main Board
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Y
Y
Y
22
N
Connect Key Pad Board
N
Replace Button Switch
N
Replace Key Pad Board
Haier HL42XD1