Sony KD-75X7800F Service Manual page 28

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2018/08/13 23:26:25 (GMT+09:00)
2.2 LED Blinking: 3x (Audio Error)
LED 3x blinking
VDD-GND short ?
Power Off
Check
+3.3V_Audio short ?
(4) POWER_AU* check
POWER_AU is supplied to
Power On
BCH-PWB for a moment.
Check
Before LED 3x blinking?
*POWER_AU is same as VDD
Detail of 3x LED Blinking
Error Item
Trinity
(Audio Error)
Yes
(1) BCH-PWB
No
Yes
(2) BCH-PWB
Replace
No
BCH-PWB
(3) BCH-PWB
Yes
Fuse broken ?
No
Yes
No
Number of STBY LED
flashing
DC_ALERT
AUD_ERR
Description
3
Main board 5V power rail monitoring
3
Audio amp error detection
Replace
NG
G-PWB or LD2-PWB
or AC Adapter
OK
Measure the Speaker
Yes
impedance by multi-meter
Less than 3Ω ?
No
Speaker Harness
Finish
Replace
Speaker
Trinity3 Board: BCH
(Supplementary
28
information)
SYS SET

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