No Sound just beeping from buttons and touch screen!

[momchil7702]

Hello, my friend buy from Aliexpress android HU with android 9.0 4ram/64 rom,PX5. So, the problem is, when he connect the HU outside the car panels, everything is working fine. After this he install the HU in the panels and connect the subwoofer with Hi to Low level converter, like the original Peugeot 407 HU. Next he turn on the HU and.... no sound, just the button beeping. He send the HU to service and after 1 month they return the HU with the same problem. So he send it to me, i'm not a expert and is my first time with android HU. I connect the 2 plus and 1 minus cables to the laboratory power supplies and i start to measure... When i play some song from the HU i can see with the oscilloscope the song from the MCU is going to the DSP. After the dsp i lost the signal. When i measure the TDA7851 i can see the beeping on the oscilloscope so i thing the is no problem with the TDA. If somebody can help to solved this problem? I'm not sure but i will order the dsp chip Adau1401a and the audio switch: sgm6510 or sgm6502a i forgot which one is the switch.Sorry for my bad English

 

[mystik_khmer]

The button beeps? but doesnt respond right? Does the touch screen on the screen works and you're able to navigate menus?

 

[marchnz]

Not an MTCB, wrong section.

 

[momchil7702]

The button beeps? but doesnt respond right? Does the touch screen on the screen works and you're able to navigate menus?

Everything is working, buttons, touch screen , but the only sound is when you touch the screen or push some button. No radio sound, no BT sound, no CD sound...just beeping when you use buttons or touch screen .

 

[momchil7702]

Not an MTCB, wrong section.

Can you show me please , where to move the question?

 

[nic2k]

That HU could possibly be an MTCD/E. Check the MCU string in About under the Android settings menu. If it's not MTCD then you could try the Android Head Unit forum.

Look through the HU setup menu (the gear icon) for a setting that relates to using the factory amp.

 

[Dicola-s]

Everything is working, buttons, touch screen , but the only sound is when you touch the screen or push some button. No radio sound, no BT sound, no CD sound...just beeping when you use buttons or touch screen .

Dear momchil 7702
I have the same problem, everything works on my headunit (Dicola XRC7112NP), but sound is only heard when the headunit is turned on.
I just took it to a mechanic, replaced the MCU chip (BD37033), but it didn't work. Then I asked the seller for an MCU update, instead of sending an Android update, it was installed, but nothing changed. MCU firmware not sent in vain please.
I'm here, I'm clueless. And what about you, did you manage to achieve something?

 

[momchil7702]

Dear momchil 7702
I have the same problem, everything works on my headunit (Dicola XRC7112NP), but sound is only heard when the headunit is turned on.
I just took it to a mechanic, replaced the MCU chip (BD37033), but it didn't work. Then I asked the seller for an MCU update, instead of sending an Android update, it was installed, but nothing changed. MCU firmware not sent in vain please.
I'm here, I'm clueless. And what about you, did you manage to achieve something?

Before 1 week i order the audio switch (SGM6502A) and the DSP IC ADAU1401...Now i'm waiting maybe 1 mount.

 

[Dicola-s]

Before 1 week i order the audio switch (SGM6502A) and the DSP IC ADAU1401...Now i'm waiting maybe 1 mount.

Dear Momchil! Thanks for the reply, I am trying to replace the DSP processor, the only problem is that the processor cannot be identified, there is no caption on it. I asked the seller for help, but I haven't received it yet.
I wish you good luck with the repair!

 

[a1jose]

Hola encontraste solución, tengo el mismo problema, gracias

 

[momchil7702]

Hola encontraste solución, tengo el mismo problema, gracias

Not yet. I'm waiting..

 

[a1jose]

Hola, le instale una actualización que me mandó el comprador pero sigue igual

Enviado desde mi MI 9 mediante Tapatalk

 

[momchil7702]

Today i change the DSP chip (ADAU1401) but the problem is the same.

 

[momchil7702]

Today i change the DSP chip (ADAU1401) but the problem is the same.

yesterday i change the Audio switch chip and the problem is the same ... i'm done

 

[momchil7702]

yesterday i change the Audio switch chip and the problem is the same ... i'm done

Hello,
i forget to write a comment... When i change and the audio switch, again the same problem... So i assemble the navigation and send it to my friend. in this 4 month i bought second hand navigation and sent together . He receive the navi's and try the second hand and with the problem . And 2 navigations is working fine. So i thing the problem is on audio switch or with the dsp ,but you need the car to test, because is working with CAN interface ot VAN i'm not sure.

Thank you.