Sony KD-49X7 D Series Service Manual page 81

3.3 No Sound Power Off Check
Power Off Check
From 2.1
(1) B-PWB
Yes
PVDD-GND short ?
(See next page)
No
(2) B-PWB
Yes
LDO out short ?
(See next page)
No
(3) B-PWB
Yes
Fuse broken ?
(See next page)
No
Replace B-PWB
Power Off Check
From 3.0
Measure the Speaker
Yes
impedance by multi-meter
Less than 3Ω ?
No
Confirm the speaker
harness
Yes
Cut or shorted
to the chassis ?
No
Return to 2.1 or 3.0
81
Replace Speaker
Replace Speaker Harness
81