A friend gave me a DVD player (with speakers so I guess it's an amplifier too) that quit working on him. He said at first, the problem was intermittent and it would occasionally make a pop from the speakers and stop working until he unplugged it for a few seconds and restarted it. At this point, when you plug it in, the red standby light comes on, but when you press power, it just goes black until you unplug it and plug it back in, no noticeable pop or anything. It's no big deal to him if I can't fix it, but I would like the learning experience and would feel a bit proud if I'm able to get it going again.
My first thought was power supply. After taking off the cover, I carefully looked over the electrolytic caps but didn't see any that appear blown. I checked the power supply output with my voltmeter and oscilloscope. One output is labelled 38V and it's only about half a volt off. The others are unlabeled, but measure +/- 12V, +5V, and +2.8V. The noise on the line doesn't exceed about 100 mV, most of them are around 50.
So far, that's all I've thought to do to it. I was wondering if anyone has any suggestions for fairly simple things to check. The device is an RCA RTD325W if that helps.