Why does the iPhone 7 screen turn black?

Question

iPhone

So, I crawled in the browser, looking for something, but for no reason, the screen stopped showing the picture, but just glows black. Searching the internet for a solution, I've tried everything from rebooting to restoring via iTunes. Nothing helped. I am 80% sure that the problem is in the software part, since the phone has neither been dropped, nor exposed to water, and so on. The last mechanical damage - the protective glass cracked, 4 days ago. Help, I will be grateful.

Answer 1

If you tried recovery through iTunes - that is, you flashed the phone, you remove the problem of the software part by 99%.
One of the options for the problem is
1. The video chip on the motherboard has died (not being repaired - replacing the board - resoldering the chip is expensive)
2. The problem with the display module cable that is attached to the board (it rots or frays - the cable changes)
3. The problem with the backlight generator (re-soldering )
4. The problem with the module (it changes to a Chinese module, which is no worse than the original)
The most adequate option, if you are sure that you have coped with the task and correctly entered the phone into DFU and flashed it, is to take it to a service center for diagnostics.

Answer 2

programmatically, there would hardly
have been cries, think for yourself the
resource and wear