Dell Latitude 5400 LA-G891P no audio

[Zibbo]

Customer says they were playing music on internal speakers and it suddenly stopped. Windows says no audio device detected.
Here is what I have done so far: I have inspected the motherboard for burnt parts or liquid damage, I have checked for shorts to ground on all supply pins, I have changed the audio IC, I have reflashed the bios with a 100% working dump, I have enabled the audio device in bios.

Here is a list of the voltages found on all the pins
1.DVDD 3.3V
2.DMIC-DATA12 2.5V
3.DMIC-CLK 3.3V
4.SDATA-OUT 0V
5.BIT-CLK 1.8V
6.LDO3-CAP 1.2V
7.SDATA-OUT 0V
8.DVDD-IO 3.3V
9.SYNC 0V
10.DC_DET 0.16V
11.PCBEEP 2.1V
12.HP/LINE1_JD1 3.3V
13.MIC2-L/RING2 0V
14.MIC2-R/SLEEVE 0V
15.MIC2-CAP 0V
16.VD33STB 3.3V
17.LINE1-R 0V
18.LINE1-L 0.10V
19.AVSS1 GND
20.AVDD1 5V
21.LDO1-CAP 4.4V
22.VREF 2.1V
23.MIC2-VREFO 0V
24.LINE1-VREFO-L 0V
25.HP-OUT-L 0V
26.HP-OUT-R 0V
27.CPVEE 0V
28.CBN 0V
29.CPVDD 1.8V
30.CBP 1.8V
31.AVSS2 GND
32.LDO2-CAP 1.3V
33.AVDD2 1.8V
34.PVDD1 5V
35.SPK-OUT-LP 0V
36.SPK-OUT-LN 0V
37.SPK-OUT-RN 0V
38.SPK-OUT-RP 0V
39.PVDD2 5V
40.GPIO1/DMIC-CLK 3.3V

What could be the reason why there is no audio? TIA

[mon2]

Re: Dell Latitude 5400 LA-G891P no audio

Pin #4 will be the audio data stream from the audio source. It is at 0v.

[mcplslg123]

Re: Dell Latitude 5400 LA-G891P no audio

You forgot to mention audio codec number??

[mon2]

Re: Dell Latitude 5400 LA-G891P no audio

It is under the schematic symbol.

ALC3204

[mcplslg123]

Re: Dell Latitude 5400 LA-G891P no audio

SDATA-IN/OUT,SYNC-none is working. Too me it seems lack of communication between audio codec and PCH. Audio jack can be the issue as well-so worth trying de-soldering the audio jack.

[Zibbo]

Re: Dell Latitude 5400 LA-G891P no audio

Thanks everyone for your assistance, I have noticed that the screen is also flickering and the display getting distorted even after LCD and LVDS cable change . I am now suspecting that the reason there is no communication between the audio codec and PCH is because the SOC could be going bad.
I didnt know about SDATA and SYNC signals, I have learnt something.
Thank you!

[syedlaiq]

Re: Dell Latitude 5400 LA-G891P no audio

Thanks everyone for your assistance, I have noticed that the screen is also flickering and the display getting distorted even after LCD and LVDS cable change . I am now suspecting that the reason there is no communication between the audio codec and PCH is because the SOC could be going bad.
I didnt know about SDATA and SYNC signals, I have learnt something.
Thank you!

Hi, did you manage to fix it?
Even I have same issue.

Please provide the solution

[mohamadjalalnourallah]

Customer says they were playing music on internal speakers and it suddenly stopped. Windows says no audio device detected.
Here is what I have done so far: I have inspected the motherboard for burnt parts or liquid damage, I have checked for shorts to ground on all supply pins, I have changed the audio IC, I have reflashed the bios with a 100% working dump, I have enabled the audio device in bios.

Here is a list of the voltages found on all the pins
1.DVDD 3.3V
2.DMIC-DATA12 2.5V
3.DMIC-CLK 3.3V
4.SDATA-OUT 0V
5.BIT-CLK 1.8V
6.LDO3-CAP 1.2V
7.SDATA-OUT 0V
8.DVDD-IO 3.3V
9.SYNC 0V
10.DC_DET 0.16V
11.PCBEEP 2.1V
12.HP/LINE1_JD1 3.3V
13.MIC2-L/RING2 0V
14.MIC2-R/SLEEVE 0V
15.MIC2-CAP 0V
16.VD33STB 3.3V
17.LINE1-R 0V
18.LINE1-L 0.10V
19.AVSS1 GND
20.AVDD1 5V
21.LDO1-CAP 4.4V
22.VREF 2.1V
23.MIC2-VREFO 0V
24.LINE1-VREFO-L 0V
25.HP-OUT-L 0V
26.HP-OUT-R 0V
27.CPVEE 0V
28.CBN 0V
29.CPVDD 1.8V
30.CBP 1.8V
31.AVSS2 GND
32.LDO2-CAP 1.3V
33.AVDD2 1.8V
34.PVDD1 5V
35.SPK-OUT-LP 0V
36.SPK-OUT-LN 0V
37.SPK-OUT-RN 0V
38.SPK-OUT-RP 0V
39.PVDD2 5V
40.GPIO1/DMIC-CLK 3.3V

What could be the reason why there is no audio? TIA

reprogram the bios

[Aliencomputres]

put an external sound card,it is about 2 euros !