Television and Home Theater

I get normal picture at the antenna inputs and at the vga computer input but no chanels at the inputs1-5 nor at the component rgb input.I have tried everything, new cables,erasing the setup and starting setup over,etc.BTW,I do get OSD on the inputs that don't have channels displayed.Any suggestions would be appeciated.

This set plays for about six hours fine, and then it shuts down. If you turn it back on, it will play for about five minutes and shut down again. I don't see any reason why it should shutdown.
 I turned down the B+ and the screen control as much as I could but it still does the same thing.
 Has anyone seen this problem before?
 I have the print.

I have a SAMSUNG PTV MODEL PTH-5498 original problem convergence (red) replaced both, also replaced pico fuses. set came up fine, i checked + and - supply voltages to convergence ic`s (ok).

let play several hours, turned off, would not come back on, red timer light "on" constant. unplugged