EDIT 2/28/22: I have noticed that a lot of traffic is being driven to this page and I wanted to make sure that anyone who is reading this is aware that I am now offering a newer version of this mod…
webhdx on X: HDMI output - it's one of the most difficult mods out there because there is no PCB made specifically for Wii Mini. I'm using Arthrimus Wii HDMI board but
HDMI Kit V0.4 Line Doubler Adapter For Wii Game Console HDMI Board
N64RGBv1 Universal RGB Board with Integrated 3.3v Voltage Regulator, Borti4938's N64RGBv1 universal RGB board offers RGB output from the AV Multi out
Universal Nintendo N64 RGB Mod with Integrated 3.3v Voltage Regulator
Arthrimus Tech
Wii HDMI Mod - AVE-HDMI : r/WiiHacks
Another Day Another SNES Mini RGB Bypass Mod feat. Dejitter Mod - ARTHRIMUS
Wii HDMI Install – 1upRestorations
Wii AVE-HDMI vs Component Review
Wii HDMI Kit v0.4 by Arthrimus