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I just swapped logic boards with a cracked screen MBP and my MBP that had no backlight, I thought the problem was the backlight fuse, but now both boards have no backlight when connected to either of their screens. Does anyone know what could be causing this?
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A faulty lcd screen and/or lvds cable can short the backlight circuit all the way back to the backlight fuse, sometimes killing a few components along the way. Proper troubleshooting would require a known good screen and known good lcd cable and at least a multimeter and a very thin soldering iron to replace the fuses in case they have blown. What might have happened here is that you have two faulty screens that kill components on the logic board. You might be in luck since it can happen a faulty screen kills the backlight fuse only, leaving untouched other components.
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