Hi @nicjunior
There are no images attached to your question.
Looking at the [https://www.manualslib.com/manual/1095484/Samsung-Rf195abrs.html?page=96#manual|schematic] it may be a problem with either the display board, the cable connection (at either end) between the display board and the main control board or the main control board.
Are the temperatures in the refrigerator and freezer compartments OK? Place an appropriate thermometer in each compartment and check if the temps are approximately 39°F (3°- 4°C) refrigerator and 0°F (-18°C).
If is it determined that a "board" may be the problem, unfortunately I cannot find a parts list for the model that includes the boards, only some other parts for the model. Hopefully there may be a board number on the board itself. It may show as DA-97 ???????? but maybe not.