Find the panel identifier on the back of the screen. Mine is LM270WQ1(SD)(F2).

Search for a controller board kit for your exact display model, probably on AliExpress. Here is the one I used.

Get an AC adapter to match your board. The specs for my board said "Power adapter input: 12V, 4A-5A" so I found one on Amazon.

Wait 2-3 weeks for your board to ship from China...

In the meantime, get supplies for the rest of the process: a spudger, painter's tape, electrical tape, needlenose pliers, adhesive PCB standoffs, and an HDMI cable.