Evaporator coil iceing up in fresh food section

Hi. It does not sound like the main control board is at fault. The ice may be related to your temp issue. Find out why the evaporator is freezing up. This can be from a frozen drain tube or a defrost issue. Both of which can block air flow from the evap fan causing food near the evap to freeze and temps in the upper section of the frige to be too warm. I have attached a link for the Repair guide on this unit. Start on page 307 to help you with figure out the temp issue, and ice issue. Take a look at the tech sheet I have attached also. You can check to see if there are any stored error codes as well as put the unit into a defrost cycle and check different components. Test your freezer sensor and evap sensor first before replacing the board. Take a look at the link I have attached for our Samsung refrigerator repair videos also. There are many videos on this issue you are having.