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Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
That would indicate that the P board is faulty and will need to be replaced. You can pick on of those up here: https://www.encompassparts.com/item/10180315/Panasonic/TZRNP11YSUU/Pc_Board though double check your part number for an exact match first.
the P board is where the incoming wall power connects through, the A board is the main with the inputs.
12v is still coming from the power supply, you may not see test points specifically but look at the output pins on the wiring harnesses
I actually don't have a service manual available right now to give you that exactly, but yes there should be a connection to the main and also out to the led backlighting, and the pins on each harness should be marked with what they are, ground, +5v, +12v, etc
Thanks for the info,
let me go back a step though to the symptoms; you said no picture, but do you still have sound?If you hold a flashlight to the screen, do you see any pictures or menus that way?
Try dimming the room lights and holding a flashlight to the screen at a 45 degree angle, if you can make out any image at all that way, then it would indicate, as I expect, that this is an issue of power not getting to the backlighting, and we'd be back to replacing the power board.
That doesn't make sense that you are getting sound then, are you sure the sound is coming from the internal tv speakers?
Can you reconnect the hdmi source (cable/dvd/etc) and retest if you get sound?
If you had an hdmi ARC connection to a soundbar or other system, the sound was coming from it which would explain this, and if that is the case the A board is what you'd replace, which would fit with the 13 blink as well.
That is really something you'd only determine if the problem persists after replacing the other boards first.
Do you need more help with this?
Okay have you proceeded with the suggested board replacement?