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You don't check voltage to the compressor because it varies. It sounds like your inverter board has just failed if the compressor isn't running and the compressor isn't blazing hot. You can unplug the wires going to the compressor to see the 3 prongs attached to the compressor itself. These are the power plug prongs for the compressor. if you have a multimeter you can test resistance between any 2 prongs. There are 3 possible combinations. If all 3 combinations have roughly the same resistance, then the compressor is good and you need a new inverter. If the resistances are really different, then the compressor is bad. Expect to see between 0.3 ohms and 10 ohms between each combination if the compressor is good.
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