Sony KD-49X9 F Series Service Manual page 39

3.3 No Sound Power Off Check
Power Off Check
From 2.2
(1) BM2A-PWB
Fuse
(F3200,F3201,F3202)
broken?
No
(2) BM2A-PWB
PVDD-GND(C3288)
short ?
No
(3) BM2A-PWB
LDO out(C3287)
short ?
No
Yes
Yes
Yes
Replace BM2A-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
39
information)