KDL-32R400A, KDL-32R420A, KDL-40R450A, KDL-40R470A, KDL-46R450A, KDL-46R470A - Sony TV Service Manual (repair manual). Page 26

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KDL-32R400A/420A, 40R450A/470A, 46R450A/470A(PA) 
26 
TROUBLE SHOOTING 
3-4. NO SOUND 
No Sound 
Change the speaker 
harness 
Speaker Harness 
issue 
Replace 
Main board 
Main board issue 
Change 
Speaker 
NG 
NG 
Check the  
“Speakers setting” 
Change to  
“TV Speaker” 
“Audio System” 
“TV Speakers” 
Symptom  
improvement 
Symptom  
improvement 
Check if TV is 
 set to Mute 
Yes 
No 
Change to  
Un-mute 
OK 
OK 
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