I hopped on over to the website: https://electronicshelponline.blogspot.com
In the search window (in the upper right corner) I typed: Panasonic TV Blink Codes
While your exact TV model is not mentioned, most of the Panasonic TV 12-blink error codes referred to a Sound SOS circuit board. If you take a look at that site, and search for the year your TV was manufactured, you might find more specific information.
SOURCE: What's your Panasonic TC-P55VT50 picture settings?
Click here to download the user manual to your TV. It have all details. Click here too to get more.
SOURCE: Panasonic viera tc-p65vt50, lite blinks 12 times and then starts over.
These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
If blinks continue without any pause, the main board is faulty.
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