Telefunken TV black screen

Hello,

I have a Telefunken TV that's relatively new (less than 6 months old). Recently, the screen suddenly went black, and I can't see anything. Here are a few details:

• It's a simple LED TV, Model: 43" TLF D6
• I've left it on overnight a couple of times. Could that have caused damage?
• I did the flashlight test (shining a light on the screen), but I couldn't see anything.
• I've tried unplugging and plugging it back in a few times, but that didn't help. I also held the power button for more than 15 seconds three times in an attempt to factory reset it, though I'm unsure if that's the correct method.
• Normally, the Telefunken logo appears when I turn it on, but now I can't see that anymore.
• There's a difference between the black screen when it's off and when it's on: I can tell it's on because there's a 'light' or backlight, but the screen remains completely black with no image.

Thank you for reading, and any advice would be much appreciated!

It was still in warranty, so we just returned it to the seller, and they fixed it, I believe they changed part of the display, not sure which part sorry.