Where is the fuse for the backlight screen

Question

MacBook Pro 13" Unibody, meados de 2012

Lançado em junho de 2012, modelo A1278. Processador Intel com Turbo Boost, até 512 MB DDR5 de RAM vídeo

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Mickael @machelmontano

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Postado: 21 de mar de 2016

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Where is the fuse for the backlight screen

Hi, I recently bought a MacBook pro 13'' 2012 with a cracked screen which had a ram issue. I just changed the screen with a new one but still no backlight.

I am getting video as I can put a flashlight behind the screen and actually see the boot processing, same thing with an external display.

I read a bit on the backlight fuse and the driver chip too but cant seem to find some images on internet for my specific model.

I took a picture of my bord near the video connector to show you guys where I think my fuse is (the one with a little P on it) and how can I check if its the fuse or the driver...

Thanks

Mickael

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oldturkey03 @oldturkey03 Rep: 781,5 mil 1,1 mil 893 2,3 mil · Answer 1 · 2016-03-21T19:25:14-07:00

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oldturkey03 @oldturkey03

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Postado: 21 de mar de 2016

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Mickael, this is strictly to identify the components you asked about, not to diagnose your board. F9700 is a 3A 32V fuse in a 0603 package and your backlight driver U9701 is a LP8550.

BTW this board has a significant amount of corrosion (marked green in the attached image) which would lead me to believe that it is a water damaged board.

You will have to clean it properly and check it for any shortcircuit. Remove the LVDS cable and inspect your connector. I suspect some damage to that as well. Check the pins properly for corrosion and short circuit. At minimum you will need the schematic, board view a multimeter to try to determine which part has failed.

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Hi, where can I get the F9700 fuse, for ebay or amazon or others, I'm based in costa rica

3 de mar de 2017 por roberto arismendi

Hi, i have the same problem with the backlight fuse.

When i change the broken fuse, the mp will be run normaly.

But when i shutdown the mp the fuse is broken again.

Has anybody an idea for a solution?

Edit:

Now i have a solution by myself:

The black plastic of the Clip from the Display plug made

a short circuit when i screw down the backcover.

6 de out de 2017 por Kniddi

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Doctor Éver Cázares @doctorever41602 Rep: 1 · Answer 2 · 2021-09-25T19:39:31-07:00

Doctor Éver Cázares @doctorever41602

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Postado: 25 de set de 2021

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Hi! That fuse is actually really simple to find, actually it's the only one on the whole logic board marked whit a big - P- on it. The issue with the back light actually got me into repair logic boards, not before f.. ng some circuits and board parts first. Anyway, if you actually are interested in replacing the backlight fuse, I would strongly advise to check for the backlight IC as well (LP8550 Backlight Chip). Also I’ll upload some pictures and info.

Good luck!!