black screen but backlight is on

hi, i have an iphone 5 with a black display. i have tried a new screen,

battery and tried the board in another phone but the problem still comes back.

if i factory reset the phone it will work ok for a day or two but then for no reason the display will stay black.

when turned on it will display the apple logo but then just a black screen. the backlight is on and the phone can be found on itunes.

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