Here's one that I have refused service on due to some very BONKERS building techniques. This thing has more boards than a surfing convention, more connections and plugs than a middle age dating party, parts from virtually every era, and on top of everything, there is NO SCHEMATIC. This won't stop us from opening it up, gawking at the freak show, and having a little fun at our own expense.
If the builder sees this video, I hope he doesn't think I'm being mean, because I am not. To be perfectly fair to him, it is likely this was a build designed to consume some spare parts and be creative with what was on hand. This appears to be a frugal build, which I admire. This build is simply outside my ability as a repair person to service without spending so much time tracing out the circuit as to render any attempt at repair uneconomical.