The backlight is not working.
My phone just turned off and then when I turned it on it doesn't lit anymore
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@ameliadepp could be the backlight in your display or the backlight driver as well. I would start with a new display assembly. Use this guide Samsung Galaxy J1 / J100 Touch Screen & LCD Replacement for that, If nothing else it will be your known-good point for further troubleshooting. Use these as your guide for further troubleshooting if it should be necessary
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Vertical irradiation the screen with a strong light, if you can see the pictrue, the back light is bad and you need to repalce a new LCD screen. If you cann't anything, the display may broken.
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