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Why do I have horizontal lines

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I have a mid 2014 macbook pro and every once in a while there will be horozontal lines moving from top to bottom. I close the laptop, open it back up and they are gone for a few seconds, but then it continues to misbehave. Sometimes it will go days without doing it, and then again, for a few hours on and off.. I tried connecting it to an external monitor and i could see the display perfectly even when the laptop screen was acting up.. ive tried to upload a pic of it..

hope someone has a suggestions..

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1)It is possible to occusers due to reseating errors of flex connectors inside Mac Book.

2) Excessive pressure damage-possible to isolate using known good Display

3) Main board malfunction - possible to isolate using known good Display

If reseating a flex connector does not resolve the issue, proceed with modular repair or whole unit replacement.

Similar issues,

-No/distorted video

-No backlight

-Vertical lines

-Image or backlight flicker

-White screen

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3 Comments:

so what do i replace or start with to try to fix it?

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Do you have Apple Care coverage account?

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nope i do not

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Andrew Golden will be eternally grateful.
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