The described may lead many to point to backlight inverters however it is extremely uncommon for backlight to work in a way that would produce "faint" light.
it is a whole lot more likely that backlight is functioning properly, but the display in front of it is all shut and not functioning, i.e. all light filters are closed and not opening.
This would point to either the T-CON board or the main board or, at worst, the LCD itself, which is however less likely.
May be something as simple as a bad connection of a cable on the LDVS cable - we've seen that happen once or twice.
We've also seen exactly that happen due to a problem on the main board, but the circumstances were such that it's hardly the same issue.
In any case , if you want the main board tested and possibly repaired you can use this:
http://www.coppelltvrepair.com/p/59/sanyo-dp52449-p52449-01-main-board-n7ke-repair-service
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