Sony RB1G Service Manual page 101

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
W600A/ W603A/ W605A/ W607A/ W650A/ W651A/ W653A/
W654A/ W655A/ W656A/W657A/ W658A/ W670A/ W674A
Size B* Board Type
(Segment: LW)
OTHERS EUROPE
32" BKX BKE
42" BKX BKE
Note:
(AYU2) – IC9000
(Brownie)- IC9001
If  NG
Check HP_DET line
(R8113 – for BA2 and BM)
(R8124 – 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
JP
BKJ
BKJ
101