Momentary backlight... LEDs replaced, voltage seems ok.. what next?

I am not seeing any BLON/BLERR on the silkscreen of any of the cards, so I can't probe it.

My LED power connector is using pins 6(black) and 10(red). I read 87V between then, and 150V to the chassis. This didn't change with the connector in vs. out.

Now where it gets truly curious is that when probing I accidentally shorted pins 5 and 6 (there is a big cap restricting access to pin 6.. and I got a small spark in doing so... at which point everything started working again ?!?!?!

I can't say I have any confidence in this... but may complete the re-assembly and see. So far it survived a 10 minute power-off and still came back on...

Oh, there is no separate tcon board, so I guess it's integrated to the main board 40-MR17T1-MAB2HG (which is annoying out of stock most places.. and the ebay listings do not inspire confidence)

Added pics to original post (can't add to comment??)

@mikezimmerman nope. Only to the Original Question and Answers. Your "short circuit" may have reset the board :) Usually when boards are hard to obtain it is because there is a factory or design error that sells the rest of the working boards quickly. To bad there is no legend to the connector so we would know if it is the power board or the main board.

For now... it still work.. will report back in a week or so... maybe there is a new "fix". Shame I spent/wasted(?) $20 on new backlights.. but still better than buying a whole new set.

@mikezimmerman if all it costs you was $20 and you get a couple of months of use out of it, perfect investment. Way cheaper than a new set.