IPhone 12 Pro Max LCD Screen Digitizer Black Genuine OEM!! Grade A - no scratches and excellent condition. Grade AB - Barely noticeable scratches under the light. Grade B - some noticeable scratches or deep scratches. Grade C multiple noticeable or deep scratches.
It's all about the touch module. Transplant the chip onto the replacement screen and the problem is fixed.
If you don't do that you will get this message even if the screen is original.