in the smd repair video you never explained how you came to the conclusion to replace the components other than the display connector. most of these were caps, and you missed one at the end of the video.

Second that. If you have thin heat shrink tubing, form some over the tweezer tips. If the tubing is thin and small enough in diameter you’ll see the serrations of the tweezer tips.

It would be a good idea if people recorded in the comments which screws go where so that, if someone lost their screw positions, they could recover them from the comments.

So, where is the lithium coin cell located?

Jodi Parker's problem sounds similar to a black screen of death issue I had with a 2012 iMac. During troubleshooting I removed the wireless/bluetooth adapter and the iMac booted up. It seems like part of the service procedure may do a bios update which labels any out of date components for the current os as incompatible -- resulting in the black screen of death for a previously working system.