Sony XBR-65Z9D Service Manual page 37

FLOW
3-5. NO SOUND (AUDIO HP/AUDIO OUT)
No Sound Audio
HP/Audio out
[Sound] 
[Headphone/Audio out]
is set to ?
XBR-65Z9D
[Headphone]
[Audio Out (Fixed)]
[Audio Out (Variable)]
[Subwoofer]
Set [Headphone/Audio Out]
to [Headphone] or [Audio Out]
Headphone Volume
Yes
is set to MIN?
No
Replace BM2
Volume
Yes
is set to MIN?
No
TROUBLE SHOOTING
Increase Headphone Volume
Replace BM2
Increase Volume
Replace BM2
37