iMac will not turn on since November

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iMac Intel 27" Retina 5K Display (Mid 2017)

Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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iMac Dead @myimacdied

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发帖于: 2019年3月31日

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iMac will not turn on since November

Hi everyone,

My iMac has been dead since november - I’ve tried the reset procedures, new outlets and new A/C cables but nothing …

I want to get it repaired but am concerned about my SSD data. I was thinking of opening the iMac to get the data prior to taking in for repair.

The other thought was to replace the PSU myself and check our the diagnostic LED’s first.

Any advice would be much appreciated!

Thanks for reading my question!

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Dan @danj 声誉积分: 478.8千 Self employed contract worker 35 329 970 · Answer 1 · 2019-04-01T04:03:22-07:00

Carefully take the display off so you can check the onboard diagnostic LED’s following this guide iMac 英特尔 27 英寸 Retina 5K 显示屏更换 You’ll need to get the tools and replacement adhesive tapes before you start [关联产品丢失或禁用： IF174-005] & Plastic Cards

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.

iMac Intel 27" Retina 5K Display (Mid 2017)

iMac will not turn on since November

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Plastic Cards

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