My phone is vibrating and turn on. But nothing

My phone has been working fine for the past year but suddenly the screen doesn't work anymore. There is just a second of grey screen when i turn it on. I have tried changing the screen hoping it would fix the problem but still no change. Plz help tq

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If you have replaced the screen, it is probably an issue with the board. Either it is not registering your touches, or the screen is not changing when you touch it. I don't have a solution, but I would try to replace the motherboard if possible.

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