Sorry for the delay.
The 2 blink code on this set typically indicates a Powser Supply Board failure, 2 and 10 blink codes on your set are commonly associated with this.
The fact that you had to unplug, then replug the TV, drains the filter capacitors, and effectively resets. So, the symptoms sound like a Power Board, and the 2 blink code can also indicate Power Board.
However, Panasonic's service manual gives several possible culprits for a 2 blink code which include, the Power Board, Mainboard, SS, or SC boards as being possibilities.
If you're looking for the most common repair, then the Power Supply Board is what I would suggest replacing. There are no instructions included with it, but it is an intuitive repair- simply removing the screws on the rear of the set, then pulling the rear plastic back of the TV off to access the board. Then you will see 3 wire harness connections that simply unplug from the board, and would then plug into the new board.
The Power Board for your set can be found at the link below:
If you wanted to be 100% sure, and are somewhat of a Techie type that can use a Meter and follow a Service Manual, then I would suggest possibly clicking on the link below to view the service manual and then follow the instructions for a 2 blink code, to effectively isolate the problem. I must warn you though, that Panasonic's method of tracking down a faulty component with an Error Code is somewhat complex:
If you'd ratehr have a Tech go through this, then they would also follow the troubleshooting steps in the Service Manual, and need to test voltages. Depending on if the A,P,SC,SS or PB boards are at fault, you would be looking at between $300-$450 parts and labor.
If you'd like you can use the links below to locate a Tech in your area:
I wish I had a quick fix or this problem, but there aren't any resets or adjustments that can be made to fix the issue and the set will require service.
If you need further assistance, lt me know and I will continue with you here.
If you're satisfied with my service (not the problem with the TV), please do not forget to rate the service accordingly.