Over 6 months ago, I purchased a "untested" Complete Treamcast bundle from eBay. Upon receiving it. It was obvious that the original TFT screen was broken due to showing coloured lines and bad contrast.
So I scoured all the usual places, AliExpress etc, with no luck on sourcing an original panel.
I finally found a new HD panel that matched the parameters I needed.
It arrived, I lined it up, and epoxied it to the top frame. I then sourced a BitFunx DC to HDMI adaptor and a flat flex HDMI cable to connect it all up.
This new panel combination will give me superior visual quality.
I also removed the Brightness & Contrast wheels and installed switches which controlled the aspect ratio and signal type.
I recapped the audio amplifier while I was in there as the Treamcast had built in audio with 2 small speakers.
The original Treamcast PSU was custom made which was super cheaply made and needed to be put in the trash. I wired up a PicoPSU as it would just "drop-in" due to screw hole placement in the bottom casing. I added USB-C with a custom printed mount at the back.
A GDEMU was added with a 3D printed mount which was remixed by me to hold a fan to keep things cool.
Obviously a ressetable fuse and rechargeable clock battery were needed.
Lastly, I replaced all the microswitches in the controllers as they were worn.