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Apple Notebooks Apple's notebook computers including MacBook Pro, MacBook, MacBook Air, PowerBook, and iBook.

MacBook display randomly blacks out (backlight problem)


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mbmsv

 
Member Since: Jan 23, 2012
Posts: 1
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Hi all,

The display on this MacBook (not Pro) randomly blacks out. Seems to be related to warming up. After the computer powers up it takes a few minutes before it blacks out first time. After it has happened I can bring it back by first decreasing brightness to 0 and then by increasing it back. Sometimes I need to wait for a few seconds before it can work. I searched internet and tried some repair/diagnostics. I changed the inverter board (got it supposedly new from ebay), but it didn't help. I have also checked that it works fine with an external monitor. So, does it mean that I need to replace the LCD panel? Or is there a way to replace just the backlight?

Thanks.
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Stalak

 
Member Since: May 16, 2012
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mbmsv describes exactly the problem I was having. My backlight problem was not related to movement of the screen. It was somehow related to load/heat, specifically if I had a few browser tabs open and then started watching Netflix. Then I would lose the backlight and only get it back briefly by reducing and then increasing screen brightness, or by shutting down Netflix. This is what I did:

I removed both of the inside (closest to the hinge) screws in the rear end of the unit. I think that over tightening these screws is causing this particular problem. I have a feeling that it is the left side (right side if facing the machine) specifically but have been too relieved to figure out which one for sure as yet. I will experiment later to determine wich screw.

The only other things I also did was to reset the NVRAM by holding down the power button for 5 secs with no power. I also did not replace the battery, which is dead anyway. I doubt very much that either of those had any effect.
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