Lost Picture (no picture) sound is good

Pedrito Otero this could be a power board issue if your backlight does not turn on, or a LED issue as well as a T-con board issue. If your backlight turns on (white or blue screen) it is possible that this is a main board failure. Unplug the set, remove the back and take a look at the boards. Check for obviously damaged parts like leaking, domed looking capacitors etc. Post some pictures of your boards with your question so that we can see what you see. Use this guide for that. Once you have those images we can point out some test points as well as possible fuse location on the T-con board. My first suspect for this is your t-con board.