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Model A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Trash picked, loud fan black screen

I'm a PC guy, but enjoy finding old Macs in the trash to tinker with. This one has the classic loud fan/black screen issue. From what I've read it could be an easy fix like a bad HDD or dead cmos battery. I'm going to remove the screen and see if any lights are lit up on the logic board. Anyone have any suggestions to point me in the right direction?

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Hi

we can point you in the right direction if you can tell us If there are LEDs lit up on the logicboard

different LEDs mean different things.

Hopefully this helps

Any questions please ask

Thanks:-)

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Hello, thanks for responding.

I removed the screen. Just the bottom led is lit up green.

par

@PimptatoPCs

are you looking at the ones @oldturkey03 kindly posted a picture of

par

Yes. The bottom one is on.

par

I'm assuming that the inverter would go out before the screen. I guess I'll track down the part and swap it out. Thanks guys.

par

PimptatoPCs why do you figure its your inverter?

LED 1 + LED 2 + LED 3 + LED 4 = Power is available, the system is turned on, the logic board is communicating with the GPU, and the internal LCD was found.

par

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Pimptato PCs what my esteemed colleague @hellomacos is referring to are the diagnostic LED's. On this model (you did pick the right model?), the diagnostic LED's are under the RAM slots.

  • LED 1 - Indicates that the trickle voltage from the power supply is detected by the main logic board. This LED will remain ON while the iMac is connected to the AC power. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power is disconnected or the power supply is faulty.
  • LED 2 - Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
  • LED 3 - Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.
  • LED 4 - Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.

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Yes, I picked the correct model. The LED that is in your picture is the one that is lit up on my board.

par

@PimptatoPCs

if you look at what LEDs are on

refer to the Guide @oldturkey03 kindly provided and you should get a hint to what the issue is:-)

par

PimptatoPCs thank you for letting us know. I will take a step back and let my colleague take the lead in providing guidance for this. @hellomacos holler if you need me but I know you got this :-)

par

@oldturkey03

Will do

I will try my best;-)

par

PimtatoPCs to early to accept :-) We have not yet had a chance to fix your computer :-)

par

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PimptatoPCs sera éternellement reconnaissant.
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