Huawei P20 lite

[badcap111]

Hi, I have a Huawei P20 lite. The problem is that the people I call, cannot hear me. This seems to be a quite common error. The phone had a cracked screen when I bought it. I replaced the screen and did a factory reset.
People can only hear me if I have the loudspeaker on.

What I have done so far is:

Factory reset.

Let the phone boot into Safe Mode - still the same problem.

Voice recording works.

Tried different network settings - (Volte, 4G, 3G, 2G)



I'm beginning to suspect that some audio IC is malfunctioning. I can't find any bitmap of the model so I don't know what to trace. Have any of you had this problem? Any idea what the error might be?

[elecsoluces]

Re: Huawei P20 lite

You have several microphone on phone.
The microphone for call is near usb-c connector.
You should replace the card with usb-c and jack connector.

[badcap111]

Re: Huawei P20 lite

Merci, elecsoluses. Thanks for your reply. I gonna try your solution.

[badcap111]

Re: Huawei P20 lite

Hallo again. The phone still has the same problem. I replaced the subboard with the mic and USB-charger port but to no avail. Then I replaced the charger flex but the people I call still cannot hear me unless the speaker is on.

Now I have looked at the connector through a microscope, and there is a black spot on the charger fpc connector on the motherboard. It doesn't look burned, it's just a black spot. I've ordered some charge connectors from China since I will try to replace the connector, but I think I have reached the end of the road as far I am concerned.

It is like the lower mic has been deactivated and only functions when the speaker comes on. Is there anyway to figure out the wiring of the board?