I've got an almost 3 year-old Samsung HL-T5687S. Just recently I noticed that the TV will not turn off. I usually would turn it off at the TV itself, but it doesn't turn off either via that method or the remote. I also can't change the input settings to select a different source or bring up the menu for the TV. I contacted Samsung and they asked me to unplug the TV for 30 seconds and plug it back in. The TV automatically turned on and would not turn off. Later, a friend stayed over and I didn't want the tv on bugging her, so I unplugged it overnight. Same experience when I plugged it back in. TV came on and can't make any other adjustments.
Any ideas? I read somewhere while searching on this issue that it might be a power relay. Samsung just told me to schedule a service call, which I imagine will be expensive, no? Thought I would do some more research before making that call. thanks!