iPhone 12 Pro Max CNC Donor Board

Chasing a broken via across several layers of an iPhone 12 Pro Max board can eat hours, and some can't be reached at all. A CNC-machined donor board for the 12 Pro Max gives you an intact PCB to move the important parts onto instead.

You can order the upper layer without NAND, or a lower layer in either the US or EU version. The listing describes it as a professional repair component, not a finished motherboard.

When via repair runs out

• Internal vias broken where jumpers can't reach.

• Several damaged layers in one area.

• Board damage under the processor.

• Recovery work on a board that won't stay powered.

Planning the transfer

Compare diode readings with a known-good board to confirm the damage is in the PCB. Then decide which components to move and in what order.

Use a preheater and stencils for every chip you reball. Pick the right lower-layer region, rejoin the board and test it on a bench supply before closing the phone. Run it for a while with the display on, then check charging and cellular service before handing it back.