Sony KD-75X7800F Service Manual page 40

3.4 No Sound Power On Check
Power On Check
From 2.2/3.1
(4) POWER_AU* check
POWER_AU is supplied to
BCH for a moment
No
before LED 3x brinking?
No
Replace G-PWB
OK ?
No
Return to 2.2
*Power_AU is same as PVDD
Yes
Yes
Finish
40
SYS SET