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If neither unit is cooling pull the unit out and remove the back cardboard cover behind the unit and tell me is the compressor and fan next to the compressor running?
OK then there is a really good chance the board is bad, can you remove the board from the unit and check the backside relay solder joints? The board is behind the square cover with 10 screws around it above the compressor area. Take that off unplug the plugs on it and remove it from the plastic mounts with a needlenose pliers...once off check the solder joints by the large black relays on the back side of the board, if you find once burned that is the issue. You should get a new board but sometimes you can clean up the joint with a brush and resolder it to get it going.
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Ok you have an inverter compressor, remove the smaller board and check the back side for anything overheated.
OK and the compressor was just warm and not running correct, but the fan next to it was?
OK do you have a volt meter?
Not sure if you are still here?
Ok with it all reconnected check at the CN1 connector to that small board for 120 volts if you have that there then checj at the CN2 connector from the Black to the Red for 5 volts do you have that there?
OK then you either have a bad inverter board, that small board or a bad compressor. That small inverter board fails all the time so I would order it from REPAIRCLINIC.COM and put it in, if it does not solve the issue then return it and you would need a compressor at that point.
You can check for 130-200 volts at any two of the compressor terminals when it should be running, also no the compressor is not a self install project,