[Al Skierkiewicz]

A completely black screen on an LCD usually points at the back light. Although manufacturers sometimes use or design sub assemblies that are on the fringe of normal operating parameters, few will intentionally design products that way any more. The back light in an LCD is a critical part and usually takes the form of a CFL (cold cathode fluorescent) bulb. This type requires a high voltage supply (DC to DC convertor) to work and it is the supply that most likely has failed.