new screen tested good, that no longer works correctly after replacem

I refurbished a iphone 6 screen perfectly, I tested it with a motherboard and everything works perfectly.

I go up the screen with all the components (metallic plate , screws , and other earphone ) I replace the screen, I close the phone , I put it on, it starts well but when I look the white background, color of screen is slightly greyish with what looks like lots of little gray claws.

I hard pressed on the screen and the color becomes white as original screen and claws disappear.

I put out the phone , I turn back and slows down the rendering returns .

sometimes the screen does not light at all.

I've done all these steps with a wrist strap, I unplugged the battery and I dissect the screen , even under backlight nothing is broken ...

Answer this question I have this problem too

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@srusso12 thank you.

I watched with a microscope if nothing was damaged or if nothing was broken , but nothing to report, I think the problem is an electrical problem or can be electrostatic .

Also, when I put the metal plate (behind the LCD) in the above table but it works above ( like the original ) ca no longer works.

The web is not torn and I have the problem of 90 % of the screens I've done and it's been really a lot (400 pcs)

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