Dialing problems after opening the phone - Xiaomi Poco F1 Questions & Answers

Hello everyone,
I replaced the charging connector on my Pocophone F1 2 weeks ago after it stopped charging. This problem is solved and it charges well.
Only after reassembling the phone the external speaker sizzled a little but after 3 days it was gone.
However another problem remained, immediately after reassembling it, it was impossible for me to call via the telephone network (no problem with the data), the telephone remained in "dialing" then cut the call with no tone. I reopened the phone to see if I had reconnected something wrong, in particular the coaxial cable near the charging connector, but it was reconnected correctly.
I receive text messages with no problems.
Surprisingly, the problem has "improved" since, when I make a call, the phone dials and there is the ringtone (I see the network bars alternated between full and empty several times) and I can converse normally for 30 sec- 1 min, after the caller hears me with a jerky, crackling voice.
Do you have an idea of the origin of the problem? I think it has to do with the antenna and not the SIM card but I don't see what else to do. So far I'm getting by calling mostly through third-party apps via data.
Thank you and have good day,
Sebastian

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[Q] After being send to service center, S2 is worse (signal and speaker problems)

2 weeks ago, I took my galaxy S2 back to the shop to get it fixed under warranty.
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But now the speaker doesn't work anymore! So I get no notifications when called or texted or alarm or can't play music, the phone thinks it plays the noise, but it doesn't. Also in the *#0*# menu, when speaker is pressed, nothing happens, no sound at all.
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Jan9000 said:
2 weeks ago, I took my galaxy S2 back to the shop to get it fixed under warranty.
The USB port was broken, as with so many S2's. I got it back after 2 weeks and the port was replaced for free.
But now the speaker doesn't work anymore! So I get no notifications when called or texted or alarm or can't play music, the phone thinks it plays the noise, but it doesn't. Also in the *#0*# menu, when speaker is pressed, nothing happens, no sound at all.
The internal speaker to make a call does work, so you can hear the recipient of the call.
But if that wasn't enough, I also get bad reception where before I would always have great reception. Now it just goes away and the phone almost never gets more than 2 bars, while my friends with the same carrier get full reception. I put my simcard in my other phone and there I have good reception, so it's not the sim card that is the problem. Also the wifi reception is worse. How is this even possible? My phone is worse than before. Before I got 3 bar Wifi connection in my room and 1 bar in the bathroom and now 1 or sometimes 2 bars in my room and no reception in the bathroom.
I reset the phone and everything, also searched the forums and found nothing.
I'm not very eager to send it in again, since they make them worse than before.
Anyone got a solution?
Standard ROM Android 4.0.3
Click to expand...
Click to collapse
send it back to service center

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