OK......you have 120V AC power to outlet that fridge power cord plugs into....correct?
NOW.......are the upper panel lights working
IF not you don't have 12V DC power to fridge (or on fridge circuit board)
There are at least 2 fuses on lower circuit board (control module) 1 for AC heater circuit (usually 5A glass fuse) and 1 for 12V DC (can be glass or a mini fuse---3A/5A)
You have to remove cover...that usually mean you have to unplug the power cord from the board and the 12V DC leads from board before you can remove cover.
12V DC power to fridge comes from your DC Dist Panel (usually part of AC Panel) where house section fuses are.
BUT if fridge control panel (panel where you turn fridge on/off) has lights then you have 12V DC power.
DO you have lights on panel?
WHAT BRAND/MODEL of fridge???