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Comment réparer son MacBook Pro 13" Unibody, modèle mi-2012, A1278, processeur 2,5 GHz i5 ou 2,9 GHz i7.

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Changed LVDS cable but no backlight although external display works

I have an old Macbook Pro that I use occasionally. I recently decided to tighten the hinge screws (I had done it successfully several times in the past) but this time my screen’s backlight was gone.

I suspect this was because I accidentally plugged the battery back in and also touched the logic board with the LDVS cable, which gave off a little spark. When I looked at the LDVS cable, the black tip was clearly a bit burnt:

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So I went and bought a new LDVS cable (A1278), but this hasn’t fixed the backlight issue. The Macbook works perfectly well with an external display however. I also did a flashlight test but I did not see anything on my desktop, so I don’t think I damaged the backlight fuse.

Any suggestions? Here are some photos of the logic board:

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Sadly I’m suspecting the logic board connector is damaged and/or the driver logic. Time to get your system to someone who has the deeper skills to fix your logic board or you could just replace it.

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Surely if that was the case then it wouldn't work with an external display either? Or do you mean the connector for the LVDS cable: https://www.ebay.co.uk/itm/MacBook-Pro-1...

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@nestormacno - Two different pathways!

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Got it. I misread your post at first. I would like to avoid replacing the entire logic board - I've already got another working Macbook but I would like to fix this one myself.

Anyway, if I was to limit the problem to the logic board, what else could be causing this apart from the LVDS connector? Could it also be the connector on the LCD display as well?

As I said in the original post, I don't think it's the backlight fuse as the flashlight test didn't show anything.

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Measuring the voltage at the LVDS connector is what I would do.

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Check the backlight fuse. You should measure 12.6 volts on both sides. Also check inside the LVDS connector for damage to the pins that were burned on the LVDS cable. If all is good then the backlight driver IC could be the culprit.

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