WiFi is bad, what's the problem?

Question

WiFi

The matrix broke down and sent for repair. After the repair, Windows flew off, they installed it, but it started to lag and Wi-Fi turned off. They installed a new assembly, everything was ok, but then again.

Answer 1

Maybe they gave it to a handyman. When parsing, I did not completely connect the wires going to the Wi-Fi board. Open it up, take a look.
Here is a similar board to look for -

Answer 2

This is a very abstract question, maybe a technical one, maybe a sofa, how does it work on another wi fi?

Answer 3

Hello. If the issue has not yet been resolved, I can tell you that most laptops have antennas between the matrix and the top cover of the laptop, perhaps during the repair the master pressed the parts hard and a contact appeared where it should not be. Perhaps the issue is also related to the long operation of the laptop and the heating of its parts. But most likely some parts are in contact that should not. Re-disassembly of the matrix and verification will most likely help. But first of all, I would check the contact wires to the wi-fi module. Disconnected and connected them again.