Model A1502 / 2.6 GHz (Turbo Boost up to 3.1 GHz) or 2.8 GHz (Turbo Boost up to 3.3 GHz) dual-core Intel Core i7 processor with 4MB shared L3 cache.

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Screen lights up a little bit but no image, works on external monitor.

Macbook pro 13" mid 2014 works on external monitor but nothing on the retina display. The edges of the screen show white light. It blinks when it boot. I checked the connector and cable, they seems to be fine. Any idea?

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Common issue on 13" Retinas, usually randomly happens or when it is knocked, and causes no picture or a black screen.

Reconnect the LCD cable logic board side first, since this usually resolves the issue (disconnect battery of course). If this doesn't work, reconnect it screen side, watch from 5:23 here https://www.youtube.com/watch?v=ZLNUjeUL...

If it is still not showing picture, try a new LCD cable. Check the screen board for liquid damage, and then the logic board if there is still no luck with this, but a reconnect should fix it.

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Yeah reconnect both sides and does the trick.

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I think it's not the connector on the logic board but the connector from the lcd. You can try to reconnected the lcd cable. It's under the black clutch.

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Is there a tutorial for it? Correct me if I'm wrong, you can't replace that cable on Mid-2014 model.

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I think it's possible but no tutorial. It is not that hard , ones you removed the display assembly you can open the clutch by sliding

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