Bad MAC address, no more WIFI

Overnight my smart tv disconnected to the wifi. Now it says me "Bad MAC address, please contact Samsung support".
I done several resets but it still doesn't work.
I also changed of wifi points, unsuccessful.
Furthermore, i can't change wifi settings, i have to reset it and change settings at first launch.
When i try to connect, i can see that my MAC address is 00:00:00:00:00:00:00

My model : UE32K5500AKXZF

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Clarification Request
It's unclear.

I've heard this before but you didn't tell the forum about your call to Samsung.

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Ok, so the support said me that my wifi cart is dead. Got to send it to the after sales service.

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Does it cost to repair?

If repair is free, let them do it.
If it costs, compare to a Roku or Fire TV stick. These sticks are always better than what is inside most smart TVs.

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