Chosen Solution
I’ve got p20 pro with completly smashed screen, it was turning on. There were vibrations and sounds like normally, just screen was black. I was sure it was damaged, beacuse it was shattered, so I changed screen and nothing changed. Screen stays black while charging, turning on, but I can hear that phone is working. I have no idea what to do…
Try a soft reset: Press and hold the Power and Volume down key wait ’til it restarts. If that fails try a safe boot. Press and hold the power button and release it when you see the Huawei logo. on screen. Quickly press and hold the Volume down key, hold it till the phone reboots, If this works it means there’s a problem with a recently installed app, remove it. You can also try clearing your cache once you have the screen available. This may not work, but it often does, holler if it doesn’t.