No Sound: Hp/ Lineout Only; Rb1 Main Board Power On Checking - Sony KDL-40W900A Service Manual

Troubleshooting
3-3-5. No Sound: HP / Lineout Only
No Sound
HP / Lineout only
BA2 / BM / BKE / BKX Power
On checking

RB1 Main Board Power On Checking

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