Sony BRAVIA KDL-55W900A, Service Manual

Page: 100 / 241

RB1G
CHASSIS
W900A/904A/905A
Troubleshooting
3-3-5. No Sound: HP / Lineout Only
No Sound
Size B* Board Type G* Board
Type
OTHERS JP
40” BA2 S BA2 W G1A
HP / Lineout only
BA2 / BM / BKE / BKX Power
On checking
This is for Main SP got sound, but HP / Lineout no sound
Note:
40 BA2-S BA2-W G1A
46” BA2-S BA2-W G1A
55” BA2-S BA2-W G1B
RB1 Main Board Power On Checking
(AYU2) – IC9000
(Brownie)- IC9001
No Checking Item OK NG If

NG
1 Insert HP Jack. Check R4508 Vdc = 3.3V ± 0.3V Vdc = 0V or < 1V Check HP_DET line
(R8113 – for BA2 and BM)
(R8124 – for BKE and BKX) got
(R8124 for BKE and BKX) got
short to GND?
2 Check IC4501 Pin 5
(X AUDIO MUTE SPHPLO) Vdc = 3.3V ± 0.3V Vdc = 0V or < 1V Check X_AUDIO_ MUTE1_ SPHLO
(Pin 5) short to GND? ( _ _ _ ) ( )
3 Check CL4505, CL4506.
(with audio signal input) Can see audio signal
waveform Cannot see audio signal
waveform Go to below item No. 4 for checking
4 Check IC4501 pin 9 Vdc = 3.3V ± 0.3V No 3.3V supply
5 Check CL4501, CL4502
(with audio signal input) Can see audio signal
waveform Cannot see audio signal
waveform Brownie IC (IC9001) NG
100