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The first thing you'll need to do is pull everything out of the freezer and remove the back panel inside the freezer. Look at the silver evaporator coils behind this panel and are the packed with frost, lightly frosted from top to bottom, some frost on top but not on bottom, not frost at all, etc... ? Also, is the fan above the coils running?
OK if the fan is running and the coils aren't frosted, pull the refrigerator forward and remove the lower back access panel behind the refrigerator. Is the fan next to the compressor running? And if you touch the big black round compressor is it warm, blazing hot, or room temperature?
OK then your have a bad relay on your main control board not sending power to the compressor. This is probably the most common way that this refrigerator fails, but the main control board behind the 8" x 10" sheet metal panel on the back of the refrigerator will need to be ordered and replaced to fix the issue. Below is a link to the part.
CLICK HERE for control board
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Then the board came faulty or the compressor is bad and would need to be replaced. You'd need to test power between COMP and LINE on the board to ground and if you have 120 volts on both, then you need a new compressor. If you only have 120 volts on LINE but not COMP, then you got a bad control board.
Sorry about the bad news today.