On Samsungs, you have to hold the door switch in for a long long time before the evap fan will kick in and run. I have never timed it, but it feels like an eternity. Probably only a 10 to 30 second wait. Also, if you hold the condenser fan and prevent it from spinning, the control will kill power to that fan for a bit, which no other fridge does, so most techs think the control is bad and not feeding power to the fan.
Either way, 28 psig on the suction side is a bit high.