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Unibody MacBook Pro models with 13" displays produced from 2009-2012.

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Screen Compatability Between Models 2009-2012

I have 3x MacBook Pro 13" Unibody Mid 2012 (2.5 Ghz Models)

To give some background, these were are all suffering from different issues being either:

(Unit A) 2012 A1278 Screen Display Burn GPU Fix? an internal GPU problem

- External Display is OK..

(Unit B) Fan spin, DVD drive sound but no boot chime, black screen.

(Unit C) A totally dead water damaged donor late 2011 unit MBP A1278 2012 No life dead......

(Unit D) MacBook Pro 13" Unibody Late 2011 - Wter damaged - Donor unit.

1x MacBook Pro 13" Unibody Mid 2009 (Unit E) which had the Stage light effect, external works fine but it was working fine with a new screen & cable albeit now with a track pad that has no click function that will be replaced with a new TP & cable or a donor from one of the above. How to fix a Trackpad with no click function? (2009-2015))

I know that the screen connectors are different between models, but being the genius I am I have mixed up their respective screens in testing them on some of the models mentioned above, and now all of them are not booting, only a spinning fan....

My guess is one of the 3 2012 screens or the mixed up 2011 has some shorted cable and has likely affected these units... (1 new LCD & 2012 Cable, 2 previously working & 1 2012 with backlight staining) The LCD connectors all look the same and fit without any fuss)

So, would a faulty or damaged connector cause all this mess? And if so, what would be the 1st place to check? I am still unable as yet to get a decent microscope to post any images of the circuit boards....

There is a blown fuse on one of the 2012 models (Unit B). Likely caused if I forgot to disconnect the battery when changing screens. I have a 2011 A1278 that I can get the replacement from, can anyone tell me which one to take as they are in what appears to be slightly different positions or any small fuse with the "P" in it?

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@livfe what is the 820 logicboard number for the 2011 donor board and what is the 820 number for the 2012 board. Where on the 2011 board do you see the component? It is always better to post images of your boards and not similar images from youtube etc. since even subtle difference can be important. Also, when dealing with logicboard components, you do want to always reference the 820 number of the board instead of the computer model. It makes things a lot easier.

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@oldturkey03 The image from the video is the same as the 2012 board.

2011- MBP "Core i5" 2.4 13" Late 2011 2.4 GHz Core i5 (I5-2435M)

Serial Number C02GFMLADV13 - EMC 2555 - 820-2936-B

https://everymac.com/systems/apple/macbo...

2012 - MBP "Core i5" 2.5 13" Mid 2012 2.5 GHz Core i5

Serial Number C1MJJDAFDTY3 - EMC 2554 - 820-3115-B

https://everymac.com/systems/apple/macbo...

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@oldturkey03 So the one with the "P" is the 3amp 32V fuses in a 0603 package correct? I guess the MB Air 2013 board didn't have the same either :( I will look at the 2011 board again and see if it is there, this 2011 board is a bit grubby but my only option. I will look for where I can find this fuse.... cheers!

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@livfe the MB Air 2013 board has one. Image of the location is posted. Let me know when you find it on the board :-)

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@oldturkey03 They are not there, one was already used to fix the same issue on a MB Air, the other looks lost from the guy who totally messed up and ruined the other 11" board. My only hope is the 820-2936-B 201 board if you can point to it on there I hope it is still present.

Update: One 11" board still has this fuse, I really need my Michael Scope to see this it is so small.... but it is there!

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@livfe these are not zero ohm resistors but fuses of different values. The component in question is a 3amp 32V fuses in a 0603 package. The only equivalent fuse on your 820-2936 board is the same backlight fuse. All the other ones have different values and really should not be used as replacement. There is nothing else on that 820_2936 board that you can use instead. Getting a proper replacement is the right fix for this. The 820-3435 uses the same backlight fuse, so you can use that as a donor part.

Here is the location of the fuse on your MBA logic board 820-3435

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@livfe here is the location for the fuse on your 820-2936 board

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You are a superstar! I am going to get into this ASAP. But this BL fuse from the 11" board is smaller and has no "P" in it..... The part I am in need of is the part in the picture with the tweezers holding it. I will highlight it. I have 2 11" donor boards and both of them do not have this "P" fuse in the location you have pointed to... maybe they already been removed.... but not by me.

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@livfe it should be identical. Post an image of it while it is still on the board. If it is different, it will already have been replaced.

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The unibody 2011 & 2012 used the same display, but! The LVDS cable came from a different vendor so if you force fit the cable into the logic board socket you can damage the cable or the socket contacts could short-out (depending which way you go) so that won’t be the issue.

The 2010 and older displays have the AirPort board within the clutch cover so first identify if that’s what you have. The 2008 and 2009 switched the pinouts of the LVDS so you can damage the displays T-CON logic which is that small board held in the clutch cover that the LVDS cable connects to.

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Yes I am aware the pre 2012 screens had different cables and AirPort boards, same with the speaker connections.... thing is, I am more focused on the 2012 models 1st (2 of them) that both give no display but are fine with an external, the screens themselves are known to be good as when I did test them on another perfect 2012 there was no issue. The 2009 is fine and I never tried it's screen on another unit for safety (Even though I think it is possible the LCD cable will fit to the screen end connection but not to the logic board)The connector on that is all gold color, where as the 2012 are silver. Nothing on the board seems to be shorted or appears blown.... it is an odd one, and BTW 2 of these units have no chime at boot... silent, I tried resetting the VRAM and SMC to no avail and the terminal command and even with another SSD Catalina install... weird, but that's another issue for later. 1st focus on why there is no display on the screen. For the record all the 2012 models have a complete fresh install which is still at the set up screen and can be heard talking mac os has a built in screen reader etc..... or something like that. My guess is it is a backlight issue....

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@danj A1278 2012 (Unit B) has a blown fuse (Picture added to the main topic area).

I have a late 2011 donor board and need to know which fuse I can use from it as they are in different positions.

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@livfe - The P (or dot) marking tells us it’s a Zero Ohm resistor (basically a jumper).


These were often used when there wasn’t a way within the foil layers to jump across or the circuit needed to be severed for Testing and as one of the last steps patched together. These are readily available.


plugging or unplugging the LVDS cable can cause a short across lines that shouldn’t touch, if your review the schematics you will see the power and the active signal lines are interwoven with grounds! This is only a risk if one fails to disconnect the battery and/or has the charger plugged in.


The logic board connector does tend to fail from lifting the cable end out befor the tang has cleared deforming the shell preventing the needed pressure so the two make full contact. Lastly, corrosion is an issue on the solder joints.

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@danj OK good, so I can use the "P" one safely?

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@livfe - That’s what the image shows is that the correct component. I ask as we’ve assumed one thing which wasn’t correct.

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