Model # of your fridge would help ... a pic of where you measured 12vdc at would help...
If plugged into shore power unplug... make sure battery disconnect is not engaged...
Measure DC at control board module supply points... you need DC voltage regardless of shore power so that the eye brow control panel on fridge will function allowing it to control the module..
I’d DL the service manual ... if you haven’t already done so and use it as a step by step TS aid
Pic of Dometic control board wiring TS section... typical.. My Dometic RM1350
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