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Introduction

I have an iMac with a broken graphics card, and it seems like a waste to just throw it away, so I've decided to convert it into a monitor, and hopefully get all the accessories working. (iSight, SuperDrive, SD card reader, and Speakers)

This is a work in progress

  1. Converting iMac Intel 27" to an USB-C monitor with 30W charging, Remove stuff: step 1, image 1 of 1
    • Follow teardown guide to remove logic board, video card, hard drive

    • Connect Driver Board to display

    • I got mine here. https://item.taobao.com/item.htm?id=5381...

    • Connect a DisplayPort (male) to mini DisplayPort (female) cable to the driver board and hotglue the female end to the iMac back panel

  2. Converting iMac Intel 27" to an USB-C monitor with 30W charging, Connect Power to Driver board: step 3, image 1 of 1
    • (Optional) If you want to use the original iMac power button, connect the switch to the 12v latching module, PP12V_G3H + GND to power in, and connect the PS_ON pin to the output. Latching module should be configured to pull to ground when "on"

    • If you just want it to be always on and use the driver power button, short PS_ON to GND

    • Pinout guides here: Can anyone tell me what these PSU pin abbreviations mean? PSU 614-0446

  3. Converting iMac Intel 27" to an USB-C monitor with 30W charging, Hook up internal USB devices: step 4, image 1 of 3 Converting iMac Intel 27" to an USB-C monitor with 30W charging, Hook up internal USB devices: step 4, image 2 of 3 Converting iMac Intel 27" to an USB-C monitor with 30W charging, Hook up internal USB devices: step 4, image 3 of 3
    • Disassemble USB Man-style hub, cut cables, insert USB sockets into usb openings, hot glue USB ports from the inside and solder everything back together

    • Something like this... https://www.amazon.com/Kikkerland-US006-...

    • you need another 5v/12v powered 4 port hub to connect the iSight, SuperDrive, SD Card Reader and the rear ports. And some donor USB cables...

    • iSight Pinout +5v = brown, D+ = Purple, D-= grey GND=black. Unfortunately Apple uses different colors for different revisions. Pinout of the iMac's built in iSight..

    • SD Card Reader Pinout +5v = orange, D+ = grey, D-= purple, GND=unshielded cable. Again, Apple uses different colors for different revisions, although you'd think the cabling color scheme would be at least internally consistent.... https://www.tonymacx86.com/threads/apple...

    • Connect the USB-SATA bridge to the SuperDrive and the USB hub. I had to cut away some plastic to fit the USB adapter

    • Power the USB hubs with the 12v pins, or use a DC-to-DC stepdown board to convert 12v to 5v. (The power supply doesn't provide a 5v rail...)

  4. Converting iMac Intel 27" to an USB-C monitor with 30W charging, Bonus steps: step 5, image 1 of 2 Converting iMac Intel 27" to an USB-C monitor with 30W charging, Bonus steps: step 5, image 2 of 2
    • Thinking about getting the speakers and Mic working as well. We are going to need a USB soundcard and an amplifier that can handle driving the built in 17W speakers

    • DIYaudio.com seems like a pretty deep pit to jump in.

    • Do I need a fan controller? I think I need a fan controller.

Conclusion

To reassemble your device, follow these instructions in reverse order.

Raf

Member since: 09/16/2020

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