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Hi my name is Robert....
This could be a thermistor or cooling unit issue. Normally if you get no cooling on BOTH AC and LP the thermisor or cooling unit can be at fault. A cooling unit can rupture or become blocked, for a rupture you might smell ammonia, hear a gurgle when you turn it on OR see a yellowish powder on the back of the fridge. For a blockage you might not have any symptoms at all but no cooling on both sources. You can check the thermistor with a volt meter to see if it is working, click HERE and see page 7... If the thermistor is good I suspect the cooling unit is at fault.... Hope this helps some.... Robert