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Lanzado en junio de 2012 / Procesador Core i7 con Turbo Boost / Hasta 1 GB de RAM de video DDR5

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Fans spin heavily and chimes at boot up, but no picture

I have a 2012 MacBook that I am attempting to repair that has an issue to where when plugged in, it will blast the fans at full speed, make the startup chime, but nothing else will happen. The screen shows no signs of life and the MacBook has no response to anything except resetting the SMC. Upon inspecting the device, I have found that it has a replaced battery, which could be a factor as to why it’s exhibiting this behavior. The person who gave this to me, told me there was never any water damage and that it just started doing this one day. I have tried everything from the SMC to plugging it in with the battery unattached, and it still exhibits the same behavior. Heres a video of me showing the issue below.

https://youtu.be/s8dFRdVezPc

If this is a logic board issue which I presume it is, is there any chance of fixing it/anyone who would be able? I will part it out and such if it’s not fixable.

Update (02/07/2020)

Here are pictures of both sides of the board. There is no clear issues as far as I can tell but you may be able to diagnose it better than me.

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You'll need to take the logic board fully out and inspect the back side.

Take some clear stills of both the top and bottom sides of the logic board and post them here for us to see. Agregar imágenes a una pregunta existente

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@danj Thanks, Dan. I just posted new pictures.

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You’ll need to do a bit of cleaning! Both the fans and logic board are quite dusty.

Get a small soft paint brush to carefully scrub the logic board to loosen the dust and use some short blasts of can’ed air to blow the dust away. Using the same brush carefully wipe down the fan blades from both sides and again blow the dust away.

Looking at your pics I do see some areas in question but the dust is hiding things. I also see some signs of wetness on the insulator plate under the fans. I wonder if someone attempted to lubricate the fans. Your dust buildup could be worse do to oil vapor coating the logic board.

While not practical for most I would use an ultrasonic cleaner with 85% Isopropyl alcohol to clean the board fully for a few minutes. The other option is to use a loadable spray can which you pressurize with the Isopropyl alcohol and using a snorkel tube power wash the board to remove the oil film as best as you can and the dust that’s being held by it. Just be sure to do this in a well ventilated area and not near any ignition sources as both the liquid and vapor is quite flammable!

The areas I’m concerned are on the main logic board with is on both sides near the right side fan (on your left looking down from the bottom) where the GPU is located. The other is the port area again both sides. After cleaning take a fresh set of these areas both sides. Do make sure your camera is parallel with the logic board so the focus is clear across the full surface of the board.

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Okay, I’ll do that next time I get a chance to take it apart! Do you think cleaning it would even make a difference?

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One we have a good view of things I think cleaning up the solder joints might make the difference. At worse you may need your logic board repaired or replaced.

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faulty graphics card, try replacing it, if that doesn’t work i don’t know what to tell you. ( it worked for me)

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Having a slotted desktop PC it might be an option. Sadly the GPU in a laptop is a chip and you would need to have the needed tools and skills to replace it. This is not a DIY project!

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