Originally Posted by MrStress
I disconnected the power cord from the motherboard and checked volts, I do pc repair but my adapter for testing with a load is standard ATX not Tivo's. I have many electronics connected to that plug and none of the others are having problems, but will check volts. Yes I to think the power supply but would like to be sure b4 buying one. Don't believe I can test with load but will try. Thanks for all ur help....
There are 3 loads with which one can test a TiVo power supply.
1. The TiVo motherboard.
2. A hard drive (not necessarily the TiVo's hard drive)
3. The TiVo motherboard and a hard drive.
Plug the plug back onto the motherboard.
Connect the voltmeter's negative lead (probably the black one) to the metal Tivo chassis on the side away from the power supply with an alligator clip if possible, otherwise you can jam the lead down into one of the holes in the back of the plug where the wires go in. Since you need a ground connection, put it into one of the holes where a black wire goes in, preferably one away from the non-black wires as much as possible.
Take the positive lead (probably red) and use it to backprobe the plug.
Yellow wire should be +12 Volts (or thereabouts)
Red wire, +5V,
On an original S3, with the clock, the gray or brown or whatever is the front panel supply and I think it's something like 8 or 9 Volts, but it should be fine.
After getting readings with just the motherboard connected, hook up a hard drive and see if the readings change very much.
Be sure not to let the leads short together while testing and always know where both ends of the TiVo's power cord are at all times.