Sony KD-75X7800F Service Manual page 39

3.3 No Sound Power Off Check
Power Off Check
From 2.2
(1) BCH-PWB
Yes
Fuse(F3200)
broken?
No
(2) BCH-PWB
Yes
PVDD-GND(C3244,C3273)
short ?
No
(3) BCH-PWB
Yes
+3.3V_AUDIO
short to GND?
No Replace BCH-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)
SYS SET