Sony XBR-55X850D Service Manual page 40

FLOW
3-4. NO SOUND (POWER ON CHECK)
Power On Check
From 2-2
(4) POWER_AU check
Yes
POWER_AU is supplied to
B / DPS Board for a moment
No
before LED 3x blinking ?
No
Replace G Board
OK ?
No
Return to 2-2
XBR-55X850D/857D, 65X850D/855D/857D, 75X850D
Yes
Finish
BMFW2 Board
(4) POWER_AU check
Measure voltage between PVDD and GND at capacitor
C7881.
Voltage rise more than 0V for a moment at power on
DPS Board
(4) POWER_AU check
Measure voltage between PVDD and GND at capacitor
C7932, C7914.
Voltage rise more than 0V for a moment at power on
TROUBLE SHOOTING
Yes
Yes
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