This is almost universally a visually striking thing to identify. If you google for blown capacitors you'll see what I mean. I should also mention that "capacit

This is almost universally a visually striking thing to identify. If you google for blown capacitors you'll see what I mean. I should also mention that "capacitor plague" is a different specific issue caused by poor quality components. I've seen a few different kinds of failures, but the majority of them are bad capacitors on the power board. The way these things fail (when it's due to a power issue like we see here), there's a loud "pop" sound, and that's a capacitor exploding, usually on the power board. It leaves black marks, soot, etc. I have very rarely ever needed to use my multimeter, although I do use my multimeter anyway, just to ensure I'm actually doing worthwhile repair work. Other things cause shorts on the boards which can damage something and cause someone to throw it away. I have opened up a TV and found one of those big, tropical, "outdoors-only" cockroaches that straddled the wrong traces. Heh I've seen some weird stuff but yeah, usually the problem is very easy to spot.