Tv not turning on

xgioxberto  the 7 blink code is a common issue with is with one, both, or all of SC board, SD board, and SU board. The most common failure is the SC board. Check for arcing evidence on the mounting screws for the SD board. You also want to post lots of images of your boards and their location with your question. That way we can see what you see iFixitでの質問に画像を追加する方法

As you see it is the SC board that reports it but can be the Vsus board as well. You can do some basic checks with a multimeter but we’ll need to see your boards to point it out.

You can do those checks without the high cost of a service call. Of course, if uncomfortable then go ahead and call for service :-)