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Released June 2012, Model A1278. Intel processor with Turbo Boost, Up to 512 MB DDR5 Video RAM

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Black screen and fan revs no chime

My macbook pro 2012 turns on but shows no display and all i can do is see how much battery life it has and hear it rev up the fan like a engine, i can only hear the fan revving up would that mean my logic board is stuffed?

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Pontuação 4

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I have fixed this problem before where the fan goes loud with black screen.

I had to get rid of a short that was on the logic board (I made it with solder accidentally)

Then it worked after that.

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Solução escolhida

Connect the power adapter to the Mac. On the MacBook / Pro's keyboard, hold down the Shift+Control+Option keys and the Power button at the same time. Release all keys and the power button at the same time – the little light on the MagSafe adapter may change colors briefly to indicate the SMC has reset.

UPDATE

We need to know exactly what it will do. I would hook it up to an external monitor to try to isolate the problem. What dos it do when you reset the PRAM?

Here's how to reset your PRAM:

Shut down your machine. Yes, all the way down, not sleep or logging out.

Press the power button and then press command-option-p-r. ...

Hold those keys down until your Mac reboots again and you hear the startup chime.

Let go of the keys and let your Mac reboot normally.

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Pontuação 6

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Have already tried that and also resetting the PRAM

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External monitor shows nothing and resetting PRAM does nothing at all

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Hi, I've been having a similar issue in my mid 2012 macbook pro but I get the chime and the screen stays black and the fans sometimes over throttle. It happened yesterday too but it had somehow started working eventually, pls help!!

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my MacBook pro mid 2012 is turning fans only. the screen is black when i press caps light is off. it seems the laptop is off, only fans is on. What can i do

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hey jonaijumba pls help me, i have the same problem in my imac 2009 model,pls

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If it is not chiming, it means it is not passing POST checks. Try booting it with the battery disconnected. It most likely is the logic board signal ppvcore_s0_cpu, so check that out as well if you have a multimeter (you will need to get a board view and schematic for 820-3115).

Most likely is a logic board issue, possibly dead CPU or voltage leading to the CPU? Check the board for liquid damage as well, and clean if it is present (but note the areas effected).

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Pontuação 5

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I think it's water damaged but i've tried cleaning it with apl alcohol and the same thing still accures, It shows no display on anything and even without the ram and hdd in it makes the same reaction no matter what i do

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Press the caps lock key about a minute after pressing the power button, does the caps lock light up? If so, it is more likely an issue related to the LCD circuit, and the fan spin can be caused by a sensor (for example, bad trackpad can cause this). Have you tried outputting the image to a TV/monitor via cable, to make sure it is still booting fine? Can you add a picture of the area where it was liquid damaged? You may need to take it to someone who has an ultrasonic cleaner, in case there is liquid under any ICs

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External monitor shows nothing on screen, ill try the caps lock method but i dont think it will work

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Ok. If the caps lock key does not light up, it means this is not getting into an OS. Due to it not chiming either, it is not passing the initial checks as I though, so it will be a more complex fault on the logic board. You can replace this which will resolve the issue, or take it to someone who can diagnose and repair the logic board (if possible, could even be a dead CPU)

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FYI, newer MacBook Pros don't chime after POST any more, so not hearing a chime doesn't mean a problem. Really, the only way to confirm POST in a no video situation is to see if caps lock responds.

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had same issue found liquid damage sings cleaned and worked for me

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Pontuação 2

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I get the same issue guys maybe is the logic board like mention above I had the bottom shell remove and some how touched the fan and it just died reboot and now this issue I really like the 2011 model it did everything for me. Should I repair???

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I have the same symptoms on Macbook Pro 13 Early 2011. It was loading OS very slowly and had a few malfunctioning keys on the keyboard. I replaced the entire keyboard, track pad and palmrest assembly, cloned the SATA hard drive in to a new SSD and placed the latter in it. It was loading a little faster. Everything looked good. Then I placed the cover on it to close. It appears a black screw fell on the logicboard which was live at the time. It must have shorted one or more circuit board components. I quickly shutdown the system. Then started encountering the symptoms described in this forum. At first it would not power up. Then I removed the battery connector and the AC adapter power connector. I held the power button for about 30 seconds to drain any charges on the logicboard. Then i connected the AC adapter and pressed the power button. The board came alive with a furious fan speed, without any video display or POSTing. I attempted the SMC and NPRAM resetting in order. No dice. I am gravitating towards the suggestion by Reece @reecee : “(you will need to get a board view and schematic for 820-3115). The logicboard has definitely undergone all run of the mill resuscitative runs and failed to revive itself. I reckon it may be time to just replace the logicboard on account that cost of Macbook Pro 13 Early 2011 is considerably low presently.

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My apologies for the decidedly negative tone of my previous posting. This is supposed to be a technology solution forum, where participants share repair methods. Mine almost reads like a political techno babble. I will definitely give it one last shot at repair. And by golly if I succeed, I will gladly share my methods by posting here again. Good luck to ya all. !!

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Please do share if you figure it out, I am in the EXACT same boat!!

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Dude I have the exact same problem. I replaced the keyboard and put new thermal paste on the cpu and gpu. After that I turned it on and it was fine . It loaded pretty well and my keyboard was working and I went to my login screen and logged in. But after that about 10 sec later the screen became black and stayed like that no matter what. So in order to reset the pram nvram and smc I shut it down and booted it up again. but then the display won’t even turn on and there was no boot chime either. The caps lock key did t light up but the fans were running in the background.

Pls tell me u were able to fix ur system and if so how

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