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Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Display not powering on

My late 2013 iMac’s replacement display won’t power on at all: No backlight, no LCD (as far as I can tell, with a flashlight shined on it). It does boot with an external display. The internal display doesn’t even appear in System Report when looking at the list of displays.

I originally replaced this display because the old one was cracked and wouldn’t power on at all either. I’ve now tried a new display and a new display cable which hasn’t helped at all. Of course I’ve also tried an SMC reset, NVRAM reset.

The fans also run at full speed when the machine is powered on, which I suspect is just because it can’t read the temperature sensor on the new display.

Apple’s diagnostics shows two issues:

There may be an issue with the System Management Controller (SMC).

Reference Code: PFM006

I imagine this is the fan/temp. sensors? And:

There may be an issue with the display.

Reference Code: VFD001

Any idea on what I could try out next?

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What is the source of the replacement display and what is the part number (Apple & display)

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Well, thats the correct display assembly from the link.

At this point you’ll need to check the onboard diagnostics LED’s. On the left edge of the logic board you’ll find them

Block Image

Here's a breakdown of the onboard diagnostic LED's:

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.

What are they telling you??

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Jonah Aragon sera éternellement reconnaissant.
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