SOURCE: Daewoo FPN-Q19DAVS American Fridge Freezer - Fridge freezing everything
I would say that the air damper valve has failed and stuck in the fully open position. It fits between the freezer and food cabinet. It has a little door which slowly opens or shuts to regulate the temperature in the food compartment. If it sticks open, the food side (Especially the top) will start to freeze up. I haven't done work on your model but it will be at the top corner of the food compartment behind the top inner panel. You will have to remove that to get to it. Its a little rectangular box with a door that opens and shuts and usually a wiring connector plug just above it.
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