My microwave just stopped working.

@dianesplace any signs of life on this? Interior lights, keypad anything? If it is totally dead it's more than the transformer. In all honesty, those transformers do not have a high failure rate. I'd be more inclined to say its a fuse or the power board.

@dianesplace since microwaves are pretty dangerous to people getting zapped, you will not find a lot of repair manuals etc. online. Remember that the transformer and the capacitor on the inside pack a powerful punch, so make sure you proceed with caution. Most commonly the power supply/distribution is part of the control panel etc. We would need to see more of your MW so see if you can post some pictures. Once you remove the control panel, you should have a clear view of the parts in question. For a countertop MW it is best to remove the out cabinet. If it would be the transformer, your MW would still show life. Same with the magnetron etc. It would not be completely dead.

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@dianesplace check the fuse first for continuity (MW unplugged and off). After that plug it in and see if you have power on the fuse. One lead of your multimeter on the fuse and the other lead on the white cable. Set your meter to something like 200VAC scale. Check that power board for obvious damage as well. Once you determined that you have power going in you will have to check power coming of that board. You can most likely do that by testing on the wires leading away from it.

Mine has a ceramic fuse you replace then it works.