Fantastic thread idea. Kudos
While I haven't done any of the modding myself, my Game Gear has had a decent amount of fixing and a mod was done to while they were in there. I did some of the fixing as well but luckily, my work was minor. Oddly, it's only been my Game Gear that's been the focus of fixes and mods.
Mod: - 2014 - Tube lights replaced with LEDs
Fixes: - 2014 - Recapping both the audio and video. New glass screen.
- 2018 - Replace motherboard entirely (old caps had finally ate through the board).
- 2021 - D-pad and button membrane replacements (done by me for once)
Upgrade Accessories: - USB power plug. Cable ups the 5v from a USB port to the required 9v safely. Works great.
- Everdrive X7 - I finally have my full GG collection.
Future Possibilities: - I'm considering the McWill (or something similar) screen mod but it's pricey.