Even without a built-in HDMI mod your CD-i player can output a clean HDMI signal thanks to this Retrotink bundle

Thanks to this Retrotink box you can easily upgrade the video output signal of your CD-i player to a clean HDMI signal and with that connect it without trouble to your modern LCD TV. CD-i member Jeroen Iking has some experience with it and shows us this one: Jeroen Iking: "For the (Dutch/Belgium) people who want to play their CD-i on a modern tv with (almost only) HDMI input (regardless 1080p, 4K or even 8K) and not looking for a permanent build in HDMI mod: The RetroTINK-2X Classic is the original version of the ultra-low latency line doubler that takes composite, S-video and component analog output from your retro-console and outputs Digital Video to your modern display. It provides a ultra clean HDMI signal! And if you got a mClassic from Marseille, you can even set it to 1080p and in 4:3 screen. But even without the mClassic, it’s a huge upgrade."