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Hi! My name is Pete. I am the expert who will be assisting you today.
You will need to use the exact power supply board, otherwise it will not work.
Here is one available for your UE50KU6020K TV:
--------------------Please let me know if you have any further questions on this topic and I'll be happy to help.Have a good day,Pete.
Yes, the board I gave you is for a UE50 - your exact model number.
You will see that the main title of this board is for a UE50KU6020K TV.
It is also compatible with several other models, which are listed in the full description, one of them being a 55" TV.