Backlight stopped working for the 2nd time after replacing mainboard

My Apple Cinema Display 24'' stopped working once, I found out it was the mainboard and I replaced it—I also replaced the power driver as I had one, but the error was in the mainboard. It's been working fine for 4 days and now, again, the same error, the backlight doesn't work.

A day after the screen stoped working I noticed the backlight had dimmed a little bit. Also about ten minutes before it stopped working it smelled a bit to "burnt chip".

Probably a new board will solve the problem but the source of the problem is elsewhere. Could it be the fan stopped working and I didn't notice it?

Is there any fuse in the main board I could replace so that I don't have to buy all the mainboard?

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@maesitos post some good pictures of both sides of your boards with your question. That way we can see what you see. Use this guide Aggiungere immagini ad una domanda for that.

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