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What is wrong with this LCD screen?

My 13inch macbook pro with retina display(late 2012) starts to show a black patch on top right corner last night and then it got worse. There has been no damage or drop to the laptop at all and it all comes out of nowhere. No sign of physical damage. External display works fine. I made a short youtube video of the screen.

https://www.youtube.com/watch?v=sDumat0e...

Fellow experts, does this have be a cracked LCD screen? How can it crack without any visible outside damage. There is no dent at all on the outside. I asked Apple genius and they say it is a crack in the LCD and I need to replace the LCD. I am wondering if there is a chance that display connection went loose inside the machine and that caused this.

Thanks!

Answered! View the answer I have this problem too

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Ben Zhang, yes the Genius are right on this one. It's a cracked LCD. How? Nobody knows, but it definitely needs to be replaced.

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Hello I wouldn't jump so fast to a crack. I have same issue MacBook Pro retina late 2012 does same thing. But when operating at surrounding temps below 50 degrees the screen becomes perfect. My conclusion is something in circuitry is the cause such as a bad solder point. Anybody with schematic of intel 4000 is very much appreciated. I'm not so fast to replace but rather would find the cause

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Ben Zhang will be eternally grateful.
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