Let’s check whether the SIM card slot status
is working or not. You can see that sim inserting, but it is showing no sim.
Apart from the display, unplug the wiresfrom the connection of the back part. Remove the sim and the slot.
You can see that two connection points are broken; we need to repair the connection points.
unbind the screws. remove the board. for my comfort,t to repair the board using
Mobile Phone Board Repair Fixture PCB Holder Work Station.
https://www.youtube.com/watch?v=dix9f25KijM
Let’s use a microscope to fix the SIM slot. As you see in this video, I’m using a
paste to clear the solid item using the soldering iron. Trying to remove the full materials of the sim slot. Now, use a soldering wick and soldering iron to clean inside the slot.
Choose a cotton bud and use mechanical oil to clean that place properly. Again,
put some paste in a few areas for cleaning purposes and heating by soldering with an iron. After cleaning, install a new sim slot and use a heat gun to fix the slot. The repair work is now fixed on the device. Connect the wires and check the sim slot.
So, you can see the Sim is working.