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KDL-70X4500 (serv.man3) - Sony TV Service Manual (repair manual). Page 22

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KDL-70X4500 (K)     2-9
2-2-4. AUDIO PROBLEM (Chart D)
Here is trouble shooting flow related audio
Audio
problem
Only 
Speaker out? 
YES
NO
UI setting
correct?
Volume, SP off/On
HP Link 
Analog
Channel
Problem ?
Digital
Channel
Problem?
HDMI
Problem ?
Set correctly or
reset by menu.
Check 
Speaker
AU board
NO
YES
NO
NO
Check
FBU board
AU board
Joint connector 
Check
AU board
Check
FBU board
AU board
Joint connector
YES
YES
YES
NO
Check
AU board
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