No 4G Connectivity, Network also not so stable

Hi, I just replaced my Xiaomi Redmi Note 4X’s screen and LCD after it got damaged from a drop while I was working from our second floor. Everything is working well except for the network capabilities of my phone, which is having problems connecting to our cell service providers (only maxes out at H+ at best)

Now it always display “no service“…but the sim card is being recognized. When I connect o a WiFi network, the status bar displays a network signal, but when I disconnect from that WiFi, the network signal is also back to “no service“.

I opened it up and I observed that there is one of the 3 pins that connects to the metal back (i think it is a signal receptor for 4G signal) that's missing. I even tried to remove the antenna cable and then reinstall it, as well as run the phone with the speaker assembly and top receiver removed but still has the same problem.

Note: We have full 4G and 4G+ coverage on our area since our cell towers are just on opposite sides of our street block. My other phone connects to 4G just fine.

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