Question about Apple MacBook Air

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I changed my macbook screen, and the backlight now will not work. Everything else works fine, just no light. My real question is what voltage should be coming from the inverter board. I read no AC or DC voltage at the output. The computer was dropped, the screen broken. I also need to know thw input voltages on the inverter.

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This could be a backlight issue, an inverter issue or a logic board issue. Look at the screen closely, if there is a faint image it's either a backlight issue or inverter issue. To weed out between the two you can just order on inverter, they're 20 bucks on ebay, if that doesn't work, replace the backlight. Maybe the new screen was not wrapped right when it was shipped, that can easily break the backlight bulb. make sure you connected the inverter to the white and pink wires correctly. Backlight repairs are somewhat difficult. As much as I would like to be able to tell you a quickfix that will solve backlight the problem, it's a pretty arduous repair that requires 1-2 hours for a trained person. It's feasible to do it yourself if you're tech savy, but you'll most likely have to google for guides that show you exactly how to replace the backlight step by step. I work for Mac Repair NYC and i have to fix this problem a lot, it's so easy to break the lightbulb in the process.

Posted on May 27, 2009

  • Steven Sosnin
    Steven Sosnin Nov 19, 2013

    LOL takes you 1-2 hours? its a 20 min fix for a trained tech.

  • Steven Sosnin
    Steven Sosnin Nov 19, 2013

    but yes, it is difficult so i suggest getting some practice first. just buy a cracked complete lcd for like $30-$40 on ebay and replace the ccfl bulb (DO NOT SUGGEST TO INEXPERIENCED TECHS) and replace the inverter and the inverter power cable. It could also be a logicboard issue if all else fails. Under the inverter connector on the motherboard, the connection point wears off or builds residue in which case you clean it very carefully and/or you can melt some solder to the point after cleaning it ONLY IF NECESSARY (ALSO NOT RECOMMENDED FOR INEXPERIENCED TECHS). Unless, of course, you have dough to blow on a new MB.

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Apple doesn't provide voltage information for the Inverter Board.
If you are getting external video then check to see if there is a dim (un-backlit) image on the display to ensure it is a backlight problem. If so then the chances are good you have a failed inverter board.

Posted on Mar 01, 2009

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