The backlight inverter board may have gone out, or it is not getting the power from the main power supply sections. Those are the two places to check. Look at the power supply to see if it has bad capacitors. http://en.wikipedia.org/wiki/Capacitor_plague
i have a black rectangle in the upper left side of my screen on all stations but not on info or...
(More)
i have a black rectangle in the upper left side of my screen on all stations but not on info or guide. please help