I was an apprentice TV repairman back in high school, but I only know how to fix tube-era stuff. I remember once when replacing a 25" picture tube, I forgot to discharge the CRT anode. I had the chassis out, everything unbolted, reached in to grab the tube, and wham! --- next thing I knew, I was on my butt about 6 feet away, backed up against another bench! My boss proceeded to laugh HIS butt off!
Needless to say, lesson learned.