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4.4 No sound
Check signal
OK
Check mute or not
OK
Check source
Check U400
OK
Check U600
OK
Check speaker
4.5 Key Board
OSD is unstable or not working
Is Key Pad Board connecting normally?
Is Button Switch normally?
Is Key Pad Board Normally?
NG
Re-connect signal
NG
Make mute Off
TV SIF
OK
Check U101
NG
Replace U400
NG
Replace U600
NG
Replace speaker
OK
OK
OK
Check Main Board
Check TV system
NG
Replace U101
NG
Connect Key Pad Board
NG
Replace Button Switch
NG
Replace Key Pad Board
22
NG
Re adjust TV system
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