The TV is going into a protective shut down, there can be different boards that cause this. For a plasma TV
, the most common is the Y-boards, but any circuit can cause a protective shut down.
It will have to be serviced. A service estimate will run $45-$75, depending on your location. The estimate charge will apply towards labor for repairs should you decide to have it repaired.
As I mentioned, a common problem with Sanyo TVs is the power supply, and if the power supply is found to be the problem, a repair could run $200-$250, labor included. If one of the Y-boards is found to be at fault, it would run about $125 plus labor - usually only one of the driver boards fails.
Sorry its not a direct - replace this - answer, but it will have to be diagnosed.
Ask if you have any questions.