I've been searching extensively and have found little (nothing, really) that mentions a 12 blink problem on a Panasonic LCD. I've found extensive info on the Plasma's but not on my little TC-L42U25 that was given to me. I can't seem to find anything on 12 blinks, but seeing as how it only has 2 boards, I'm fairly certain its one of 'em. The power board is the MPF2941, if there's any known problems with it.
I found a number of guides on http://tsn.pstc.panasonic.com/
by searching Google, but nothing that references my model specifically. All fo the info I've gleaned so far was close, but not nearly the same, so I have no leads to follow.
The only other indicator I have of the problem is that after a moment that it starts to boot, there's a high pitch whine from the power board, then the blinks start. There's not been a picture since this issue began.
Any assistance would be most appreciated!