kenmore freezer icing up

Refrigerator & Freezer Repair
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[LEFT]For the last 2 months my freezer icing up.After removing back panel of freezer there is build up ice on coil.I tested Heater, Evaporator with meter and works ok.Then i replaced thermostat and having same problem.I try few times defrosted using hair dryer but after 5 days its icy again.Looks like fridge works and works.Everything in my freexer is so frozen and hard.Anybody knows what can be the problem?

thanks Tom
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If you replaced the defrost thermostat, a round item clipped to the top of the evaporator coils, then the most probable problem is the control board AP4366538