Chosen Solution
Device: Oppo R831K It was long time when the phone went just black and it was never fixed. I searched also on the internet how to fix it and they said to put the phone into recovery mode. But when I power it on or try to open the boot or recovery mode, it does nothing but vibrate but the battery works and it can be charged. It just vibrates and the screen won’t show anything not even the logo or boot.
Sounds like an LCD issue. Have you tried opening it up and checking the cables and connectors? It would also help to have another LCD to test on it. Does your computer read the phone through USB?
