LG KP500 no signal problem

[leegoon84]

hi I have an LG KP 500,
it was working fine and one day it decided to have a very low signal.
I'd normally get 4 bars at home but I was getting 1 bar or no bar at all.
when it's no bar it becomes emergenc only mode.
I tried with my old moto V3 just to make sure it's not the network nor sim.
and the phone works fine with moto.

I tried with several different firmware including the most recent one.
it didn't help either.

I opened up my phone and made sure the antenna was making a good contact with the board and it was.
I was playing with the antenna for a bit like attaching a paper clip and so on.
it seemed like it did help a little bit by adding a paper clip but I can't use the phone that way.
when I'm outside, I sometimes get a full bar but it decreases to 0 or no network.

this is really frustrating.

can this be fixed by repair nvm like LG dare?
if so can this be done without any tools?

I flashed my phone using the usb cable that was provided with my phone thus I don't use any of the unlock tools.

my phone works as long as it shows that I have the signal but it's so random and overall it's having a super low signal.

btw it shows correct imei

thx in advance