Lg lsc27931sb refrigerator won't cool or freez3

Sounds like the auto defrost drain in the freezer is blocked with ice and the water is draining down into the refrig box. Usual cure is to remove inside panels in the freezer to expose the cooling coils area. Then use a hairdryer to melt the ice. Plenty of rags for this. Next you must clear the ice blockage in the drain. Make a loop of #12 or #10 copper wire (bare) about 18 in long. Hold it with a pair of pliers while you heat it with the hairdryer. It will slowly melt the ice in the drain hole. Pour hot water through the drain until it come out on the drip pan below. Now you need to see why the ice forms. Just above where the drain hole is under the coils should be a calrod heater that is powered by the defrost timer to melt the ice. It sometimes gets out of position. Another possibility is the failure of the defrost timer. If you can rotate it manually see if it initiates a defrost cycle. If so and does work, check wirinf connectors at the timer. If OK replace timer.