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Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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My display only works when plugged into an external monitor

So last week, I tried fixing the loose hinge of my macbook. When I put everything back together, the display does not work anymore. Everything boots up fine except the display does not show anything. So i tried plugging an external monitor and now everything works fine, but my display still doesnt work. So now I have to use my macbook while attached to the external monitor.

Should I buy a new LVDS cable or a new display?

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Check to make sure to see if you have a backlight. Of course you can always hope it is the cheapest solution which would be the cable , most likely it is an issue with your board.

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Could it still be an issue with the board since my macbook turns on and runs fine? The only problem is that I need an external monitor to view the display.

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I'd check/replace the cable between the motherboard and display first. Often these break or short due to being rubbed/moved back and forth and pinched every time the lid is opened and closed. Otherwise, the panel is likely the cause.

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Goto Apple Logo >>System Preferences >> Display and select the Internal Display. Obvious solution but worth a try...

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