Regarding low network signal (possible solution?)

[Sowa96]

I've been using this phone for the past few days, and I noticed that the network signal is really low and non existent in closed environments.

Today, I noticed this YT video https://www.youtube.com/watch?v=e-QRcGrUK8M that explains how to change the network antenna.
And in the comments I noticed these comments that maybe it's not a non-functional antenna, it could be that one of the connectors are loosened.
The phone is still under warranty so I won't **** with it, and it isn't mine. If someone tries it, it would be nice to post it here because there are a lot of people with that phone that have that problem.

Did you check if the Signal Antenna cable was connected well? Problem might be that. And if the cable was connected well but it still can not work as before, the connetor might be damaged. you can replace it with a new one. hope this can help you. 

I've opened my phone again, and noticed one of the connectors had loosened. Connected it back to the motherboard, and started up. Phone instantly had network signal again . Thanks for the response, and thank you for the great tutorials! Upvoted them! ^^

 

[LilBlinx]

There is nothing such as loose connectivity. Either it's plugged or not. Switch to other modes, 3G, 2G and see if it is the same

 

[Sowa96]

There is nothing such as loose connectivity. Either it's plugged or not. Switch to other modes, 3G, 2G and see if it is the same

Поздрављам комшију

Selecting 4G/3G or 2G didn't solve anything.
That seemed to solve problems to a lot of people.
For the past 3 days, I had half to full signal and I was satisfied with it totally, and suddenly it dropped to zero and lost it. I was furious, wasn't sure anymore was it HW or SW related. And I did some search through forums and I saw somewhere that reflashing the modem or baseband via Flashtool can be good.(I found a thread where people selected USA band and lost signal). And I thought to give a try.

When I restarted it, for few seconds it was blank and it went full bars. I was happy af
So reflashing the modem file that comes with the firmware can make solve it (at least in my case)

 

[Sowa96]

Now after 3 days, the problem returned. No signal again, so I'll have to flash it again