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Sorry to say most times this is a faulty compressor. A compressor is a electric motor and pump mounted from springs inside the black dome, if one of these springs stretches or breaks the motor and pump hits the outer casing dome and bangs when it shuts off. Other things to check for, tubing touching one another, something fallen behind the freezer, defrost condensing pan out of place ( frost free models ).
The hinges have springs inside them that hold up the lid, so the hinges should be checked. Often the problems is a build up of ice in the lid that makes the lid so heavy that the hinges cannot hold up the lid. When you defrost your freezer, prop up the lid and leave the freezer off for 24 hours defrosting, this will allow the ice in the lid to defrost and hopefully make the lid much lighter. Sometimes the insulation in the lid will have to be replace if the insulation cannot be defrosted or the ice block is too large to defrost in a day or two.
If your freezer is dead ( not running and no noises )...possible trouble makers:
- house fuse/breaker
- cold control is open
- power cord or outlet
This is most commonly a system problem, compressor, system leak, restriction. Usually big $$$. A service tech can let you know if the freezer is worth spending repair money on it.