HTC Touch Diamond backlight permanently dying?

There is a post at XDA-developers, where the people are complaining that after using the Touch Diamond for few months, the backlight goes down permanently! The screen’s backlight does not come up even after reverting back to the original firmwares. This clearly signifies that it is not due to firmwares as other HTC Diamonds are working fine.

Flashing the base ROM gives the following error:

Microp Version Mismatch 0
Please update latest Microp firmware

I don’t know what it means. It is too early to make out, if the problem is hardware-related. I hope it is software-related because then, the issue can be solved via releasing firmware. But, if it is hardware-related, then HTC will have to deal with millions of Diamond owners from all over the world.