Apple 6 broken screen changed. Why are there white dots on the screen?

The screen of iphone6 was changed to a domestic screen, and it didn't take long for a lot of white dots and white dots to appear. Want to know if this is the screen or the machine itself? If it is because of the screen, is it because of the domestic screen?

Unscrew the screw with a pentagonal screwdriver.

Clamp it down with tweezers. Gently pry it up. When there is an opening, slowly open it with a nail or crowbar.

Notice the order of the screws here. Because there is a screw here that is not magnetic.

Observe the position and quantity of all screws. Remember who pressed the baffle on whom.

It is recommended to remove it from the top first. Remove the bezel of the camera and slowly remove the plug. It is worth noting that the sequence of the left cables is recorded.

Remove the home key bezel and slowly pull off the home key cable. Note that you should also tear down the line linking the screen!

Finally, I still remind you to fasten the front end of the screen first, then the bottom end of the screen, and finally the left and right screen edges.