Sony XR-55X90K Service Manual page 52

TROUBLESHOOTING
2.2 LED Blinking: 3x (AUD_ ERR)
3x blinking
(AUD_ERR)
Main Board
Audio Amp Fuse broken?
TV
Main Board
Power OFF
Audio Amp PVDD-GND short?
check
Main Board
Audio Amp DVDD-GND short?
Main Board
Audio Amp PVDD OK?
TV
Before enter 3x blinking,
Power ON
Check voltage supplied to B-Board
check
Audio Amp PVDD for that moment.
Yes
No
Yes
No
Yes
No
Yes
No
OK
Replace
Main Board
NG
OK
Replace
Power Board or LD-Board
NG
Measure the Speaker or Tweeter
Yes
Unit impedance by multi-meter
More than 10Ω or
Less than 3.6Ω ?
NG
No
Measure the Speaker Harness
Or Tweeter harness
Yes
connectivity by multi-meter
No connectivity? or
Shorted to GND/Chassis?
Main Board
Main Board or
LD-Board
Replace
OK
Speaker or
Tweeter
Replace
OK
Speaker Harness or
Speaker Harness or
Tweeter Harness
Speaker or
Tweeter
Tweeter Harness
52
SYS SET