I suffered from this issue too, and had been reading all sorts of things online. It used to be that the only way I could get the display to show anything was to put it in the freezer. I had been reading about how the display ribbon cables or flex connectors could become disconnected if the device was dropped. I had recently dropped my device, and right after that the issues started. I was considering taking my phone apart (that would have been my first repair, and I don't have really any proper tools), but before I went that far, I decided I should try to push the top of the display together with the other side, using much more force than I was comfortable doing on any kind of electronic device. ( The top because after dropping it right on the screen the top right corner seemed to pop out a little bit). that solved my screen issues! hope this helps you guys!
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Edit: I have read several of the answers on this thread and found that they can definitely be useful. This is where the freezer answer came from (look in the comments for this post). Hope you can find something useful! https://www.ifixit.com/Answers/View/326672/Phone+wont+charge+or+turn+on.
I suffered from this issue too, and had been reading all sorts of things online. It used to be that the only way I could get the display to show anything was to put it in the freezer. I had been reading about how the display ribbon cables or flex connectors could become disconnected if the device was dropped. I had recently dropped my device, and right after that the issues started. I was considering taking my phone apart (that would have been my first repair, and I don't have really any proper tools), but before I went that far, I decided I should try to push the top of the display together with the other side, using much more force than I was comfortable doing on any kind of electronic device. ( The top because after dropping it right on the screen the top right corner seemed to pop out a little bit). that solved my screen issues! hope this helps you guys!