Why is there a loud buzzing after I record a video

[Android Central Question]

I recently changed the charge port on a Nokia 5 phone and I decided to run a full test on the phone. After the test, I found that (mic 1) failed in the loop back test when you dial the ussd code (*#*#372733#*#*).
I started hearing a buzzing sound coming from the headphone speaker. I then tried recording a video, but the same loud buzzing started again. Could the heat of the hot air gun and soldering iron caused the 2 mic to fail?
I also saw dust in the microphone located at the back could that be the issue?

 

[belodion]

This may be beyond the diagnostic powers of our members, though there may be a few repairers among us. https://forums.androidcentral.com/ask-question/409154-join-android-central-community.html

 

[VidJunky]

While it could be possible that components became overheated buzzing in the mic doesn't seem like a symptom of that. Buzzing from overheating seems like something you would see in a speaker vs a mic. There is a driver in the speaker and if the film used to transmit the sound were damaged or became loose this could come out as a buzz. I would more easily picture a mic simply dying. A buzzing mic would seem more like a signal being sent to the mic maybe from an overlapping solder connection. Could you have crossed two leads by a small piece of solder? If the mic is getting power on one of the leads from a bad solder connection it may just sound like noise.

Have you confirmed the mic is the issue by playing something back on another device? I ask this question without much hope that it will lead anywhere because you are not complaining of other playback issues. Like playing a ringtone or watching a video. This would count out the issue being a speaker problem but I have to ask just be sure we're focused on the correct component.

Let us know what you find and perhaps there's more advice to had.

 

[Android Central Question]

Yes. The speaker is working

I tested the speaker and it works well. The phone has 2 micro phones nokia claims the one at the back is for noise

 

[mustang7757]

Re: Yes. The speaker is working

I'm not clear what the issue is ?

I'll leave a Link to register so you can communicate here as a guest account you can only post questions but can't reply
https://forums.androidcentral.com/showthread.php?t=409154

 

[B. Diddy]

I merged the thread into what I'm pretty sure was the original guest thread.

To the OP, you really have to register if you want to have any kind of reasonable discussion. If you don't register, you can't respond within the thread you started.