Freezer is not deforsting

If your model you listed is a TFX27PRBWW it will have a defrost timer located in the fresh food compartment and behind the controls. It's location is 257 in this photo HERE I would like you to turn the timer clockwise slowly until youi hear the compressor and fans stop. This should put the refrigerator into defrost if the defrost heater is still working. Did you hear any crackling or sizzle when place into defrost this way? Wait up to 35 minutes for the timer to come out of defrost and it should restart the refrigerator compressor and fans. If it does not come on automatically then simply turn the timer slowly clockwise again until they do restart. If you need to turn timer again to start refrigerator you will need to replace the timer=> WR9X489 Defrost Timer

If the defrost timer is not the problem then we move to the freezer side, remove the rear panel of freezer and defrost the frost covering the evaporator as in this photo HERE The model TFX27PRBWW takes a=> WR51X10055 Defrost Heater Assembly

and the defrost thermostat=> WR50X122 Defrost Thermostat
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The defrost heater is location 230 and the defrost thermostat is location 24 in this photo HERE Instructions in testing these parts are located on the parts pages I listed above. Please let me know if the model number is different than the one above your post so I may help you better, Thanks Sea Breeze