What are the (e.g., no power, clicking sound, or no backlight)? Do you have a multimeter available to check voltages?

The main processor cannot run on 12V. The schematic will show several buck regulators: Powers the IR receiver and memory. 3.3V: Powers the Flash IC (BIOS). 1.2V / 1.8V: Core voltages for the TSUMV56 CPU. 4. The LVDS Interface

Look for version numbers printed on the silk-screen (e.g., V1.0 or V1.1), as component values may change.

Since this is a combo board, the backlight driver is integrated.