UPDATE: I have more information. After this I change a value on config.plist with Clover Configurator and I have again 3 min of black screen. But I try another thing: Put again Lilu and Whatevergreen on L/E and EFI/KEXTS/OTHER. Restart. And remove again the kexts from L/E and EFI/CLover...
Hey, I found a solution for my black screen. I remove Lilu.kext and WhateverGreen.kext from L/E and EFI/CLOVER/Kexts. Now I don't have the 3 minutes of black screen.
I try to restart, and power off. It works. So I think it would be and error with those kexts.
Core i7-8750H - 16GB RAM - UHD630
Acer Aspire 7 A717-72G-7600
Cheap laptop with everything I need: A good screen display for this price (73% Adobe RGB and 100% SRGB), good colours and design, fast processor with 6 cores, M.2 for ssd and wifi