I've replaced the C32 capacitor, the speaker, all of the buttons, the button membranes, and the shell. I also soldered in an audio amplifier mod, and alongside the capacitor upgrade the sound is absolutely incredible. OEM screen.
Thinking about fixing up a busted old GBA SP I have as my next project!
From top left to bottom right: MagicX Zero 40, Anbernic RG DS, DS Lite, AYN Thor, Nintendo 3DS, Anbernic RG Nano, Game Boy Advance w/ IPS screen, Game Boy Color w/ IPS screen, ModRetro Chromatic, PSP Go, Zelda Game & Watch, Miyoo Mini Plus, Game Boy Advance w/ stock hardware, Game Boy Advance SP (101), Anbernic RG35XXSP, Anbernic RG 406V, Anbernic RG 351P, Nintendo Switch, Nintendo Switch 2, Steam Deck, PS Portal, Anbernic RG 556.
Between myself, my wife, and my 5 year old son, nearly all of these get played on a weekly basis. A few are currently not working, like the 556, but my kid especially loves trying different old games on each system. He's currently on a huge Kirby kick across hardware generations.