Tutorials for DIY Black Screen Repair for Galaxy Flip 6?

My son has an unlocked Galaxy Flip 6, that went out of the 1-year warranty window last month. A few days ago after an update, he got the infamous black screen problem. Front screen works, inner screen totally black. Tried a bunch of YouTube and Reddit suggested tricks (massage, tapping, rebooting, freezing, bag of rice) nothing worked. Called a fix-it place and were told it would be $400 to fix since it was out of warranty.

At that point figured we'd try to do the repair ourselves and if it doesn't work, we're not much worse off than we are now and can use the $400 to buy a new phone. Is anyone aware of a YouTube tutorial or other tutorial for taking it apart to do the repair?