MTL may be experiencing different symptoms than you, Indian. The "dim" display which you experienced is indeed very common. Had the same thing happen in my car, which I fixed by re-soldering the resistor on the circuit board inside the stereo. Very easy fix.
A completely 100% blank screen, even when illuminated with an external light source such as a flashlight, is symptomatic of a failed display board and/or connection, and is different than the dim display problem. This too is possibly repairable - I believe there are some DIYs available online for it.
Last edited by ZeGerman; 11-13-2012 at 08:37 PM.