Sony KD-55A9F Service Manual page 45

3.3 No Sound Power Off Check
Power Off Check
From 2.2
(1) KJ2-PWB
Fuse Yes
(F9000, F9001, F9002, F9003)
broken?
No
(2) KJ2-PWB
Yes
PVDD-GND
(C9025, C9046, C9067, C9088)
short ?
No
(3) KJ2-PWB
Yes
LDO out(C806) short ?
No
Replace KJ2 PWB
Power Off Check
From 3.0
Confirm the speaker
harness
Yes
Cut or shorted
to the chassis ?
NO
Measure the Speaker
Yes
impedance by multi-meter
Less than 3Ω ?
NO
Replace Speaker Harness
Replace
Speaker
(Supplementary
45
information)
SYS SET