@juanantoni78806 if it turns on when you remove the ribbon cable, the issue is actually with the panel. Most likely a failed LCD driver board. Those are the long skinny boards that connect to the LCD and can not be replaced. The only thing you can try is a "Tape-Off". Let us know what model your TV is and post one more image. Show us exactly which ribbon cable you disconnect and if you have half a picture or still no picture but it turns on.
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=== Update (12/10/23) ===
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@juanantoni78806 The data comes to multiple lines. Yes, it will come on with some of the cables disconnected but you will find that eventually you'll lose data signal. It only works if you leave the other ribbon cables connected. The outputs of the ribbon cables are not identical on the left and right. By disconnecting that ribbon cable you remove the "fault" that actually prevents it from coming on. It gets the data from the other side as well. I know its weird, but I just work with it ¯\_(ツ)_/¯
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Anyhow, so this appears to be a panel issue. I'd try a Tape off on the side that is preventing your TV from coming on. Take a look at these YT videos
Now try this. Leave the cable you previously disconnected (your picture #3) connected. Turn your power off, disconnect one of the ribbon cables from here
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[image|3172470]
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and reconnect your power. Turn it on. What do you get? Disconnect the power, reconnect the ribbon cable, disconnect the next one. Reconnect the power and turn it on. What do you get? You see the pattern :-) give it a try and see what you get.
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You know all your boards are new so the likelihood of this being a board issue are very, very slim. That leaves the panel. Tape-offs work about 3/4 of the time but when they work, they work. Also, if nothing else, take a look at your driver boards. Those are the boards where the ribbon cable terminate. See if you find anything odd and fixable on those.
@juanantoni78806 if it turns on when you remove the ribbon cable, the issue is actually with the panel. Most likely a failed LCD driver board. Those are the long skinny boards that connect to the LCD and can not be replaced. The only thing you can try is a "Tape-Off". Let us know what model your TV is and post one more image. Show us exactly which ribbon cable you disconnect and if you have half a picture or still no picture but it turns on.