-   I have the same problem. Watching T.V. with my grandkids and the T.V. just keeps turning off by it self. Now it won't stay on!!!!-   sstraughn
I had the same problem with my Son's TV ( Disney Cars 13" TV/DVD). It would work for a few minutes and then turn off. After reading the other posts, I found one that mentioned dry solders in the flyback section. I removed the back cover, again pretty easy with the help of another post on this site. (remove the lug nuts, and then the 6 screws that hold the wheels on. With the wheels off you can remove the 1 screw per side that need to come off. In addition, ther are 2 small screws by the video out section, and the 2 more screws at the top of the back secton.) really not bad.
I labeled each of the cables, and then removed the main board.
I used a basic soldering iron and retouched each point on the power and flyback sections of the board. I did not really see anything that looked bad, but I'm technician but I have played with electronics over the years.
reassembled and it works, it has been on for an hour now.
the av chanel has vanished. it is no longer on the menu and the input button will not change it to...
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the av chanel has vanished. it is no longer on the menu and the input button will not change it to the chanel