Well, you can't guarantee it because they don't. Please google it, or better yet buy a plasma TV, disassemble it, and try to find the backlight. Plasma TVs work basically the opposite of LCD tvs. In an LCD tv, the backlight emits white light and the pixel blocks some of it to make colors or (tries to) completely block it to make black. With a plasma, the pixel itself is the thing that emits light, by energizing a gas inside, similar to how a neon sign works. A plasma pixel at baseline voltage emits almost zero light (nearly black), and a fully energized pixel produces white light. Not having to block unwanted light is why plasmas historically have had better black levels than LCDs. Newer LCDs with full array LED backlighting can turn off entire zones making them have true blacks in some situations. You can argue that LED tvs are better for gaming since they don't have the risk of burn-in, and the picture quality is now approaching that of plasma, but you can't argue basic facts. There is no backlight in a plasma tv, bud.

You know what I don't realy care bud mine has a setting to turn down backlight I was just trying to help out that's what Samsung told me but you google you would know more the them

They may say that to keep it simple for folks like yourself, but your tv does not have a backlight if it is a plasma. I will paypal you $100 if you can prove to me that your samsung plasma has a backlight. Not that it has a "backlight" setting, but that it has a physical backlight. Are you sure it's not an LCD? This is not a controversy like man made climate change. You simply have a misunderstanding of the basic principles of how different television technologies work. What you're saying is the equivalent of claiming that the new Macbook has a DVD drive. It does not. End of story. CRT, Plasma, OLED - No backlight LCD, LED (aka LCD with LED backlight)- Backlight It doesn't make you look foolish to admit when you're wrong. What's foolish is to dig in when you know you're wrong. Your intentions may be good, but spreading misinformation helps no one. That is why I'm trying to set the record straight.

Sounds like an lcd TV you have there....there's brightness settings but no blacklight. That'd be like me telling you to turn the temperature down on your telephone

No it's a plasma I do have a led upstairs but Mabey the backlight setting on the plasma is for something else it goes 0 to 20 I run it at 13 because it's in a low light room