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Procesador Intel Core i7 de cuatro núcleos a 2,2 GHz (Turbo Boost de hasta 3,4 GHz) o 2,5 GHz (Turbo Boost de hasta 3,7 GHz) con 6 MB de caché L3 compartida.

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I replaced the battery on my MacBook Pro screen not working

I replaced the battery on my 15” MacBook Pro w Retina display mid2014 using an ifixit kit and following all the directions. Battery powered up but now the display screen is not working. I went back and checked all the steps and all seems good. Any ideas what it could be?

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Aim a flashlight through the lids Apple Logo are you able to see a faint image of your desktop and its icons?

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No I cannot see a faint image of the desktop and the Apple logo never lit up

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Check all motherboard connections, you may have forgotten to connect the LCD cable.

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It does sound like you missed a step or damaged something in the process. Go back to the guide and compare the parts with yours look very carefully Reemplazo de la batería en la MacBook Pro 15" con Pantalla de Retina de mediados de 2014.

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I am sorry misunderstood the question and saw it performed online. Yes I can see the desktop when shining a flashlight through Apple logo

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@scottpask5 - Thats good and bad! Good that we've narrowed down the issues. The bad is you likely did damage something here.

Disconnect the battery as outlined in the guide, then disconnect the display connector and take a picture of the connectors both the logic board and the cable ends so I can see the contacts and post the pics here Agregar imágenes a una pregunta existente

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The last photo is a connection that there were no instruction to disconnect during guide to replace the battery but obviously became disconnected as I removed the board. What is this connection for?

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Jump to Step 22 in the guide that is one of the two speaker cables.

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