Connecting USB DVR Disables Sound (Pumpkin 5.1.1) - Android Head-Units

Hi there,
Hoipe someone can help
I have a Pumpkin Single Din Android HU - MTCB on 5.1.1.
Model: RQ0110 on Stock firmware
I bought the Pumpkin DVR camera to use as a dashcam.
But after plugging it in, music volume gets muted.
Mute is off, volume is adjustable, player is playing, graphic eq is registering, but no sound.
Touchscreen beeps are working so it is not a hardware issue.
- I have tried music and video
- I have tried stock music player, poweramp and VLC
- I have tried playing bluetooth music from my phone.
Still no sound other than touchscreen beeps.
As soon as I unplug the DVR camera, the sound comes back on.
I have gone through the settings to see if there is anything that may be causing it, but I can see nothing.
If anyone can help that would be great.

Hello. I have a erisin android 5.1 and the same problem. Any solution ?

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3 possibilities:
- go to factory settings and check individual source audio volume
- try with another music player (poweramp has a gain knob, you can turn that down). I had this issue with poweramp that sounded distorted, while default music player was fine. Turned down the "vol" knob a bit in EQ/Vol settings and it was fine.
- change unit
zerozoneice said:
3 possibilities:
- go to factory settings and check individual source audio volume
- try with another music player (poweramp has a gain knob, you can turn that down). I had this issue with poweramp that sounded distorted, while default music player was fine. Turned down the "vol" knob a bit in EQ/Vol settings and it was fine.
- change unit
Click to expand...
Click to collapse
Thanks zerozoneice, well, i've upgrade my android to version 6 and problem of sound still exist in addition to SMS shown on the screen said ; ' UI & MCU does not match '
I ve tried other media reader but no change.
Now supplier told me that this is a hardware problem and that he will send me a mother board because he though that actual one may be damaged.
could this problem of sound be a mother board issue ?
odervich said:
Thanks zerozoneice, well, i've upgrade my android to version 6 and problem of sound still exist in addition to SMS shown on the screen said ; ' UI & MCU does not match '
I ve tried other media reader but no change.
Now supplier told me that this is a hardware problem and that he will send me a mother board because he though that actual one may be damaged.
could this problem of sound be a mother board issue ?
Click to expand...
Click to collapse
just about could be
zerozoneice said:
just about could be
Click to expand...
Click to collapse
Additional remarks :
after removing the headunit for test i ve felt an overheating in the back (not screen side) could this have relation with MP3 sound issue ?

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