Hitachi 22LD4550U Service Manual page 69

22"LCD TV Hitachi 22LD4550U
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
68