Thunderbolt Display USB-C Retrofit for Modern Macs!

'Behind the screen' details of how I modernized a Thunderbolt Display to keep using it with a new M1 MacBook Pro.

Completely hidden, no desktop dongles, still just two connections, but now they are both USB-C.

The Thunderbolt Display still charges my MacBook, and the MacBook now runs 3 external displays and more with just 1 cable!

Please be aware: The procedure in this video involves opening and modifying an AC mains powered device. The left side power supply board has many exposed solder joints, and capacitors may store charge even after power is disconnected. You should not need to handle this board or plug in the open monitor, but proceed with caution anyway, and if in doubt, check with a meter.

Be aware, be safe, but don't be afraid!

Here's one of the meters I use, to test USB based power:
https://amzn.to/3W4qnbI

Here's the full parts list:

USB-C Power Delivery Buck Converter:
https://www.ebay.com/itm/124456288878

USB-C Power Delivery cable:
https://amzn.to/4b1qpWh

Apple Thunderbolt 2 to 3 adapter:
https://amzn.to/4aC71PB

Apple Thunderbolt 2 short cable:
https://amzn.to/3vUKa2D

Thunderbolt 3/4 extension cable:
https://amzn.to/49zMPNb

Schottky Barrier Diode
https://amzn.to/3TZeGQV
(this is what I had on hand, but any Schottky Diode rated above 5A and 25V should work the same way)

39.4KΩ resistor (or as close as you can find to it), rated 1/4 Watt or higher
Either buy a resistor kit that includes 39K resistors, like this one:
https://amzn.to/4aDILwu
Or else you'll probably have to buy a whole bag of them! But they are inexpensive:
https://amzn.to/449lRuI

1/2" or 5/8" Grommet:
https://www.homedepot.com/p/Everbilt-...