system
Given the following post, respond as if you're commenting on Reddit:
human
Why bad HDMI connection causes pink lines on a screen?

So when you use a bad/broken HDMI cable there are sometimes pink lines or some colour get replaced by pink flicker. Why is that? (from a technical standpoint)
gpt
It depends on the equipment used, specifically the TV. In general the answer is that images are usually transmitted in so-called YUV color space, instead of RGB. This has to do with chroma subsampling - essentially your eyes are not as sensitive to color differences as they are to brightness, so the YUV signal allows for less bits to be spent on color information, which saves bandwidth (and therefore allows for higher frame rates and resolution).

Depending on the system used, a bad connection will result in missing or corrupt digital data. If you replace YUV data with all 0's, the resulting color is a forest green. If you replace it with all 1's, the resulting color is a bright pink. So the system you were looking at apparently used 1's.