1st Method: Charge your device up to 45-60 minutes. Put your Huawei P20 Pro and P20 on charging and wait until 45-60 minutes. And after that remove charging and try to switch on your device. 2nd Method: Remove SIM card & memory card. Because of faulted memory card or damage SIM card, your Huawei P20 Pro won’t turn on or black screen issue Asking for a friend who just bought the P20 Lite. He said the screen auto rotation was working for a couple of weeks then suddenly stopped functioning. Only likely significative things that happened in the mean time are two: a system software update and my friend dropping the phone. Given that according to what I've found on the internet the mvHRP.

huawei p20 lite screen not working