Go outside and open the Fridge's outside compartment.. There will be an outlet there, may be a single or a duplex.. Plug in a test lamp (A trouble lamp will do, or any 120 volt test lamp, table lamp, or simple (non electronic) Device, Or if all you have is a radio. it will do) Does it work? YES, next step, NO you have a 120 volt supply side issue.
On the bottom is a small circuit/terminal board, this is NOT the control board,, It has fuses, WITH THE FRIDGE UNPLUGGED check those fuses.. ONE of them is, as I recall, a 120 volt fuse (You can follow wires to figure out which, simple board) the others are 12 volt.
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When you replace the outer cover..... REMEMBER the Drip Tube on Dometics goes through a vent hole to the OUTSIDE of the compartment.. One possible issue is water dripping on that simple board may have tosted a trace or connection,, This is easily fixed, but.. Why make it happen?