I'm not sure why it would only work when plugged into the laptop. What other devices is it connected to that the television doesn't turn on when they're attached?
I have a 32" LCD Samsung TV and it wont turn on anymore. One day it just stop turning on. Today i thought i'd try something out because i had always noticed the little USB plug-in in the back of the TV. So i had a USB to USB cord lying around so i tried plugging it into my laptop to see if i could tap into it somehow. I figured it wouldn't work because i didn't have a driver for a TV on my computer, anyways it didn't work or even show up. However when it is plugged into the laptop and i hold the power button for a few seconds it suddenly works. but it only turns on when its plugged into the laptop. Please tell me why.