My Samsung Refrigerator model #RFG295AARS/XAA-0000 is not working properly. We replaced 6 sensors, 3 fans, sub board and main board. Checked all voltages and resistance of wiring, including the defrost heaters and compressor. All were within tolerances. We have gotten the freezer to work, but not the refrigerator. We have gotten the refrigerator to work, but then the freezer didn't work. It will only work on the refrigerator with power cool on. Once the power cool goes off the refrigerator stops working. Cleaned all the drains, cleaned off the evaporator coils. We can hear the compressor change speeds from low to high. Tried recalibrating the temperatures, still no luck. Could it be a bad TDM valve or could the compressor have lost it's coolant charge?