Hello, my problem is that I got a snes and when I turned it on and I find that the screen turns black in both video and channel, take apart, clean the connector with isopropyl alcohol, check that the board is not short, check the fuse, try another source and various games. But the failure persists, when turning the console on and off, note that it emits a download sound and the screen goes black as if receiving a signal. any of you have any idea what else can it be?