If you own one of these & it freezes & runs continuously, chances are the NTC thermistor is faulty. You have 2 options Pay to repair or do it your self. My option is do it the easy way, Purchase a NTC thermistor 10K @ 25deg from Jaycar sealit up & hot glue to bottom of fridge inside & run wire through were light goes. The thermistor is about $1.35.  Icouldnt be bothered droping the compressor & diging out the old one as this set up works fine & is easier to replace if necesary.  Cheers Daryl

OOPS, there is a part missing in the circuit diagram. A resistor R1 , 30K fitted betwean pin 3 & pin 8 of the IC  LM358.  Sorry about that senior moment.  Daryl.