A new iMac G4 Mod with up-to-date hardware and unchanged appearance including pro speakers

Discussion in 'iMac Mods' started by wingworm, Mar 1, 2014.

  1. kiwisincebirth

    kiwisincebirth

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    Mar 2, 2014 at 12:03 PM #11
    kiwisincebirth

    kiwisincebirth

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    Hats off to you. This mod is excellent, and a great first post. Your use of the original original components is amazing. The heat-sink solution is most elegant, but would like to know what CPU you are cooling and what temperatures you get under load.

    Also It would be good if you could post some more details about Item numbers 2 (usb 3 by firewire) and number 9. I am especially interested in how you have achieved this, as it is something I still have to tackle.

    Also out of interest I am wondering if you could provide more details about the PSU pinouts, conversion, on off control, etc, for other who may want to follow.
     
  2. MacTester57

    MacTester57

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    Mar 2, 2014 at 1:12 PM #12
    MacTester57

    MacTester57

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    This is just great. :thumbup:

    It would be cool, if you could post some more details such as pinouts and detail photos.

    I've reused the original speaker connector in my HemiMac mod but used a new AMP.

    MacTester
     
  3. wingworm

    wingworm

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    Mar 2, 2014 at 2:56 PM #13
    wingworm

    wingworm

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    Hi ersterhernd, thank you for your high appraisal:). After a glance at this board, I found so many great iMac Mods here which are so helpful if I could found this earlier. e.g. yours and MacTester's.
     
  4. wingworm

    wingworm

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    Mar 2, 2014 at 3:58 PM #14
    wingworm

    wingworm

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    The heat-sink solution is just copied from original design of iMac G4. The CPU is G1620 with 55W TDP, a lowend one just for experimental purpose. A rough test shows the cpu temperature rises 20 centi degree at idle, while rises 45 centi degree at 100% load of both CPU and GPU.

    IMG_1395_1.jpg

    I'm now purchased GA-H87TN for haswell platform, and the CPU selection would be i5 4570s or 4670s, with 65W TDP, we will see the heatsink performance then.

    GA-H87TN.JPG



    USB3.0 just added 5 pins (5~9) over USB2.0, so the solution is Pin1~4 go to original USB 2.0 port, Pin5~9 go to original 6-pin 1394 port. These 9 pins will be merged outside to a usb 3.0 female connector.

    USB3.0_Pinouts.PNG

    Regarding the displayport extention, my initial thought is reuse the min vge connector which have 15 pins. Though the displayport has 20 pins, some are just gnds for signal shield and some are just reserved. Later I found the female mini displayport connector can fit to the io cover very well by replacing the mini vga connector. This will offer higher signal quality.

    dp_mindp.PNG



    I will try to add more details when implement the haswell upgradation.
    Besides, Dremel's blog http://www.dremeljunkie.com/ is very place for the more details on PSU, LCD etc.
     
  5. wingworm

    wingworm

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    Mar 2, 2014 at 4:37 PM #15
    wingworm

    wingworm

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    MacTester, I just read through your post on HemiMac, it's so great work and amazing we share some ideas similarly. At end of this mod, it failed to squeeze more space for full size DVD drive as I mentioned, I also considered to switch to intel NUC, which can be just put into HDD place. But I'm not sure if NUC provide good interface for extension, For example the jack detection for headphone?

    To not affect the appearance, I also have planned to use touch sence and MCU for dimming, display on/off, fan speed control etc., but I never thought to drill on the dome. Since the capacitive sense structure is quite simple, it's possible to implement on a soft pcb which can be squeeze between the dome and the plastic housing. Besides just press, more actions like slide, wheel can also be possible.

    capacitive_sense.png

    A question in my mod, it's using +5V of HDMI to determine the backlight. But when the display goes to sleep, the +5V is still present, thus backlight is not turned off. What's your solution? I'm now trying to seek some IC can detect the TMDS signal, but if there's a simple way?
     
  6. patrickeaola

    patrickeaola

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    Mar 2, 2014 at 10:32 PM #16
    patrickeaola

    patrickeaola

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    love this mod most of all as it seems to be the least difficult , ssd?do you have more pics ?
     
  7. kiwisincebirth

    kiwisincebirth

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    Mar 3, 2014 at 3:50 AM #17
    kiwisincebirth

    kiwisincebirth

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    Have a close loo at Post 87 of MacTester's build. The solution is the front panel power indicator (LED), that comes from a header on the motherboard. Intel motherboards (assume others as well) allow you to display sleep mode in a different LED state e.g blinking. On the NUC you can set this a dual colour mode which reversers the polarity of the signal for dual colour LED's, this can easily be detected and used to drive micro controller or other inverter cutout circuit.

    Kiwi
     
  8. Bansaku

    Bansaku

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    Mar 4, 2014 at 8:29 PM #18
    Bansaku

    Bansaku

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    Wow, simply amazing mod!

    :thumbup: Bravo! :clap:
     
  9. mykuls

    mykuls

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    Mar 5, 2014 at 3:15 AM #19
    mykuls

    mykuls

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    Awesome! :clap:
    How did you figure out all of the audio circuitry on the original mobo?
     
  10. mykuls

    mykuls

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    Mar 5, 2014 at 3:37 AM #20
    mykuls

    mykuls

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    Does the H87tn now use the same efi bios as the other gigabyte mobos? I remember reading the ivys and sandys thin mobos used some laptop variation or something.
     

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