Sony A1E Series Service Manual page 30

FLOW
3-1. NO SOUND
No Sound
Without LED 3x
AV receiver is connected
to HDMI in ?
No
[Speakers] setting is
[Audio System] ?
No
Headphone is connected to
HP/Audio Out terminal ?
No
[Sound] 
[Headphone Speaker Link]
setting is [On] ?
No
Go to
Power Off Checking
XBR-55/65/77A1E
Yes Select [External Inputs] 
[BRAVIA Sync Settings] 
[BRAVIA Sync Control]  [off]
Yes
Change the setting to
[TV Speakers]
Yes
Disconnect the Headphone
Change [Sound] 
Yes
[Headphone Speaker Link]
to [Off], OK ?
Yes
Replace BKA/DKA board
HP/Audio out terminal
or Headphone detect
GPIO may be broken
No sound only
Analog RF and Digital RF ?
No sound only HDMI ?
Replace DKA board
No
BKA board
TROUBLE SHOOTING
Yes
Go to
No Sound Tuner
No
Yes
Go to
No Sound HDMI
No
OK
DKA board
NG
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