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I couldn't find any info on your freezer but there are 2 main ways units defrost. The first is manual defrost where you have to unplug the unit to defrost it yourself. These unit are typically chest freezers and upright freezers that have no fan and the refrigerant runs through the shelves. You can tell because frost will mainly build up on the shelves themselves. The second is self defrost. These units will have a fan in the freezer and a evaporator coil behind a wall inside the freezer. This wall is usually inside the freezer on the back wall. These units have a heater that is activated by a timer and comes on every 8 hours or so and will heat the coil for 20 to 30 minutes. This removes all the frost build up on the coil and you should never have to do anything. I hope this helps.
The heating coil and terminator are in the freezer compartment - behind a protective panel. The heater is usually piggy-backed on the freezer coil and the terminator is in contact with the freezer coil to detect its temperature. The defrost timer is a simple assembly of a clock motor with switch contacts that can be located anywhere the manufacturer desires. The timer turns on or enables the defrost circuit every 8 or so hours for up to 30 minutes give or take.
When the timer has enabled the defrost cycle, the cooling mode ceases; the compressor shuts off and power is sent through the terminator to the heater. The heater warms and melts any ice build up on the freezer coil. The water drips to a pan and flows down the tube to a pan under the fridge - where it is evaporated off. The heater warms the freezer coil until either a) the timer returns to cooling mode or b) the terminator senses a preset rising temperature on the freezer coil. Once either condition is present, power is interupted and heating stops. The compressor is energized through the adjustable thermostat in your fridge. Since it is warm, the compressor turns on and cooling begins.
If any of the components listed above (1,2 or 3) have failed, the defrost cycle never warms the freezer coil and the ice never melts to clear the freezer coil as intended. Air can not be circulated through the freezer coil since it is choked with ice, so even though the compressor runs, the fridge and freezer spaces never get colder. The adjustable thermostat never sees the temperature you've set so the compressor never shuts off.
Water dripping in the fridge is melting ice from the freezer space - as the freezer is not getting colder - only the protected space around the freezer coil is.
To fix this, you'll have to get the service manual or schematics for the fridge to determine where the parts are located and do some troubleshooting with a multimeter after disassembling the freezer compartment and wherever else to access the timer if needed. This is not a good first appliance repair job for a DIYer due to the danger of refrigerant and testing live electrical parts in closed in spaces.
The most common problem with refrigerators not cooling when the freezer cooling is the fan which supplies cold air to the freezer. Not easy to get to in most cases. Another problem is the vent to the fridge part is blocked or not operating with the adjustment control.