You know to check fuses. I see one in there.
If you can't identify a fuse, I fear you are in deep waters. What's next? If you are an electronics tech you know to get the service manual. Many are over at samsungparts.com
My tv was on and just went off. No red power light, no click when you try to turn it on. Per Samsung I unplugged everything from it and unplugged it for a day and plugged it back in with no reaction. I removed the back cover and all capacitors look brand new. Any ideas?