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If frost is forming on the back wall inside the freezer, it means that either the door was left cracked open or your unit isn't defrosting on it's own. You'd need to pull everything out of the freezer and remove the back panel. With a multimeter, test continuity through the defrost heater that runs along the bottom of the silver coils where all the frost is forming as well as through the defrost thermostat which is the 1" round device clipped onto the top of the silver coils. If either part does not have continuity, then replace it. If they both have continuity, use a hair dryer and thaw all the frost out and re-assemble. If the frost doesn't come back then the door was just left cracked open too long. If the frost does come back, then you need to replace the display board since that is what controls the defrost cycle.
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