In this PART 2 of replacing the LCD screen of my Blackview A70 mobile phone I demonstrate what I did inside the back of the phone. There were a lot of screws, one of them hidden behind a sticker, three connectors, one battery etc. But all-in-all it wasn't difficult - just fiddly.
After the replacement LCD screen was fitted and reassembled, the mobile phone worked. However, for some reason the phone doesn't "see" the micro SD card external storage. Whether this issue would have occurred if I'd taken the phone to a mobile phone repair shop; who knows.
I can't imagine why this happened, but I've since bought an OTG (on the go) micro SD card reader to act as external storage if I need it in the future. It fits into the charge port.