My phone realme 7 pro screen got all black can I fix it at home?

Assuming your problem is a display that has died, yes it is definitely possible for you to replace it yourself. On your phone the display comes either with or without a frame, but the only guide I was able to locate is for replacing a screen with a frame. You may be able to save a few dollars by buying a screen without a frame, but if you do that you're on your own with regard to doing the replacement; you may be able to find videos on YouTube.

Here's the guide for a screen with the frame.

Manuales / Realme 7 Pro / Fullscreen

You can find replacement screens on the major sites including Amazon, eBay and AliExpress.

Note that in addition to the screen itself, you'll want to make sure you have a sheet of precut adhesive to reseal the rear case once you're done.

Good luck; let us know how it goes.

Realme 7pro display change