Audio Error - Sony XBR-65Z9D Service Manual

FLOW
2-2. LED BLINKING 3X (DC ALERT AND AUDIO ERROR)
DC_ALERT
3-time blinking
OK
Check
+5.0V_VBUS at "C431"
4.959V<Voltage<5.285V?
NG
IC402,etc
(B* Board)
XBR-65/75/100Z9D

AUDIO ERROR

Audio Error
Power Off
Check
Power On
Check
*For BFM chassis: if with AC adapter,
*For BM2+DPA chassis: "B-PWB" indicates either BM2 or DPA
LED 3x blinking
(Audio Error)
Yes
(1) B-PWB
VDD-GND short ?
No
Yes
(2) B-PWB Replace*
+3.3V_Audio short ? B-PWB
No
(3) B-PWB
Fuse broken ?
Yes
No
(4) 12.5V check
12.5V is supplied to
B-PWB for a moment
before LED 3x blinking?
G-PWB refer to LD board
TROUBLE SHOOTING
Yes
Replace B-K Harness
OK ?
No
Yes
Replace G-PWB*
OK ?
Finish
No
Yes
Measure the Speaker
Replace
impedance by multi-meter
Speaker
Less than 3Ω ?
No
Speaker Harness
29