When I was a kid my family got a big, ancient second hand TV that had individual "cards" for the R G and B components. One day a diode on the red card blew out

When I was a kid my family got a big, ancient second hand TV that had individual "cards" for the R G and B components. One day a diode on the red card blew out. I soldered in a replacement and the replacement diode lasted a couple minutes before also blowing out with a "bang!" Obviously a short somewhere else, but I didn't feel like troubleshooting it. What to do? Well these 3 cards all look pretty similar, I wonder what would happen if I swapped slots? Well, turns out it works! Just whatever color channel the bad card was in would go out. To get a "full" range of colors I swapped the red and green cards so that we'd have red and blue and it would be the green that was out. The result was surprisingly decent; you could tell something was "off" about the colors but not bad. However, after watching TV for a couple hours, when you looked away the real world would appear green!!