Hitachi 32LD4550U Service Manual page 69

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32"LCD TV Hitachi 32LD4550U
6. Key Board
OSD is unstable or not working
N
Is Key Pad Board connecting normally?
Connect Key Pad Board
Y
N
Is Button Switch normally? Replace Button Switch
Y
N
Replace Key Pad Board
Is Key Pad Board Normally?
Y
Check Main Board
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