Hello successes to all colleagues who can help me with this problem. I arrive at my workbench by the closed vertical, I change it and it has no blue color. By testing it by placing a resistance to ground with respect to each cathode all colors come out. I left it like that for a while and now when I turn it on, sometimes some lines are seen at the top and they are removed and after 15 minutes or more it goes out. Thank you very much if it is a protection failure. Thank you so much everyone.