Can anyone decode what the 4 LEDs mean on the logicboard of the iMac. This is a late 2015, but documents from other models could be helpful too. Looked for Apple edited repair manuals, but found nothing.
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Status LED on iMac logicboard
- Thread starter Eugen Mezei
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this post explains all the details :
www.ifixit.com
In the thread about the GPU upgrade people mention these leds on several occasions so I presume they are the same for all models.
iMac Intel 24" EMC 2134 and 2211 Diagnostic LED's
The 24-inch 2007 and 2008 iMac's have four diagnostic LEDs on the logic board that can help troubleshoot the computer. A little disassembly is...
www.ifixit.com
- LED 1 - AC Power detected
- LED 2 - Power from the power supply is detected by the main board. If off, something is wrong with the power
supply. - LED 3 - Mainboard and video card are communicating succesfully. If off, something is wrong with the video card.
- LED 4 - Videocard and LCD panel are communicating succesfully. If off, something is wrong with the LCD panel.
In the thread about the GPU upgrade people mention these leds on several occasions so I presume they are the same for all models.
