You could always try mirroring the screen to a TV etc, as it is the CPU that generates the display images. The display is dumb, it only shows what it receives from the CPU. This doesn’t mean that there isn’t a problem on the systemboard though.
If the mirrored display is OK then as a DIY repair all you can do is to open the phone and ensure that the display flex cable connection to the systemboard is secure and then if it is OK to temporarily replace the screen and check.
Here’s the ifixit Samsung Galaxy A10 Repair guides that will help you to do this.