Freezer Fine Fridge Too Warm

I have posted before that my fridge went bad and also my ice and water was not working. Since then I HAVE TAKEN THE WHOLE FRIDGE APART and found only that the mother board was burnt I replaced that and now the freezer and ice and water are working fine but fridge is still to warm,checked damper and it seems to work but don’t know how long it is supposed to stay opened is it possible it could be bad and not staying open long enough because if it is good the only other part that may be bad is the temp contrl knobs for the freezer and fridge. how can you test the damper and or the control board/knobs for freezer/fridge. Any and all help would be appreciated.:confused: