No Sound: Hp / Lineout Only; Gn1 Main Board Power On Checking - Sony KJ-32W7 C Series Service Manual

Troubleshooting

3-3-5. No Sound: HP / Lineout Only

No Sound
HP / Lineout only
BAX-LPower On checking

GN1 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
If  NG
NG
Vdc = 0V or < 1V Check HP_DET line
(R7020 – for BAX-L)
got short to GND? If short to GND
replace board.
Vdc = 0V or < 1V Check X_AUDIO_ MUTE_ SPHLO (Pin
5) short to GND. If short to GND replace
board.
Cannot see audio signal Go to below item No. 4 for checking
waveform
No 3.3V supply. Please refer
item 1.3. No POWER -
DDCON/LDO.
Cannot see audio signal Brownie IC (IC9001) NG
waveform
Note:
(AYU2/Ayu2L) – IC9000
(Brownie)- IC9001
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