Sony GN3TR - No Sound (Power off Check); No Sound (Power on Check)

XBR-49/55/65/75X900E
TROUBLE SHOOTING
FLOW
3-2. NO SOUND (POWER OFF CHECK)
3-3. NO SOUND (POWER ON CHECK)
33
Power Off Check
From 2.2 LED BLINKING 3X
(AUDIO ERROR)
Measure the Speaker
impedance by multi-meter.
NG value of
right table?
Confirm the speaker
harness
Cut or shorted
to the chassis ?
Replace Speaker
No
Yes
Replace Speaker Harness
No
Yes
Return to
2.2 LED BLINKING 3X
(AUDIO ERROR)
or NO SOUND
Power Off Check
From NO SOUND
(1) B board
PVDD-GND short ?
Replace B board
No
Yes
(2) B board
LDO out short ?
(3) B board
Fuse broken ?
No
Yes
No
Yes
Speaker Impedance
Rated Impedance NG Value
KP woofer 4ohm less than 3.2ohm
KP front 6ohm less than 4.8ohm
KS/KH 8ohm less than 6.4ohm
Power On Check
From 2.2 LED BLINKING 3X
(AUDIO ERROR)
No
(4) PVDD check
PVDD is supplied to
B board for a moment
before LED 3x blinking ?
No
Yes
Replace Power-Supply *
OK ?
No
Yes
Return to 2.2 LED BLINKING 3X
(AUDIO ERROR)
Finish
*Power-Supply is
AC Adaptor model : JK board & AC Adaptor
built-in power supply model : G board
PVDD (POWER_AU) voltage is
240W AC Adaptor model : 24.0V
200W AC Adaptor model : 19.5V
Built-in power supply model : 12.5V
Measurement point is same as (1) PVDD-GND
short check.