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This is newer than the models I am most familiar with. EEPROM corruption could still be part of the problem you're having, but the failure mode is likely different.
It's unusual that the backlight is on as it is turned on by the signal board - usually by pulling the BL ON (or similar) line to +5V.
Something on the signal board pulling both BL ON and PS ON high while pulling the 3V rail down will probably end up leading back to the one big IC that does everything. I'd check any voltage regulators on the signal board, but beyond that it's probably only viable to replace the signal board.
In a way it's convenient that so many of these thin sets get cracked - there's usually used boards on eBay.
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