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DaveWM made you a very nice list, but I want to add that (especially to the layman) the first two are the most likely for that specific condition, as well as being good, basic maintenance practice for anyone beginning in vintage electronics, or REAL electronics as I like to call it. LOL!
You need to gain a fundamental understanding of electricity to begin with and this is best found in old school text books. I have some nice ones in the classifieds section of this site if you want to take a look at the post. "REAL" electronics is almost a lost art and you can't even really learn it in modern day colleges or whatnot. The stuff uses much higher voltages and thus commands a whole lot more respect than what is learned farting around with transistors and other PN junction based components on a breadboard in a lab.
Learn your fundamentals and learn how to use a multimeter properly. You won't even have to think or use math as far as reading a modern digital meter display. If you like what you learn, move to a good quality analog meter like a Simpson 260 or better yet a VTVM! Welcome friend; be safe and good luck!
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"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free"
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