Sony KD-55A9F Service Manual page 43

3.0 No Sound
No Sound
Without LED 3x
AV receiver is connected
Yes
to HDMI in ?
No
[Speakers] setting is
Yes
[Audio System] ?
No
Headphone is connected to
HP Out terminal ?
No
TV speaker Volume
Go to
3.3 Power Off Checking
Select [External Inputs]→
[BRAVIA Sync Settings]→
[BRAVIA Sync Control]→[off]
Change the setting to
[TV Speakers]
Yes
Disconnect Headphone
Yes
OK ?
No
Headphone Volume
Volume Bar shows
Replace BM3 board
HP out terminal or Headphone
detect GPIO may be broken
No sound only
Analog RF and Digital RF ?
No sound only HDMI ?
Go to
3.1 No Sound Audio
Finish
Yes
3.7 No Sound Tuner
No
Yes
3.8 No Sound HDMI
No
Go to
Go to
43
SYS SET