10 Replies Latest reply: Aug 29, 2013 7:16 PM by crakarjax
TheRealAnubis Level 1 (0 points)

Hi all,


I just picked up an Apple ADC to DVI adaptor, and it's not working.  I popped it apart, and aside from some corrosion on the bottom of the circuit board (no where near any capacitors) I don't see anything obviously fried.


My question is - does anyone have a schematic service manual or diagram for this unit? - specifically the plug that comes from the power supply and plugs into the video board inside the A1006 (top right in the picture).  (There are 2 different boards inside the white enclosure)






I figured, if I get that, I can test the voltages and if needed, find a way to replace the power supply with something else (unless anyone knows where to get one of these pretty cheap)



  • TheRealAnubis Level 1 (0 points)

    Just to add - It is a 6 pin plug - 1red, 3black, and 2yellow wires.


    From the label on the PS,  I know that there are 2 DC voltages being supplied:


    26V 3.3Amps


    5V .75Amps


    It is an ACBel Power supply, and the part number is - APi1AD48

  • crakarjax Level 1 (0 points)

    Hi,  I am trying to hack on one of these as well.  Since the colors of the 6-pin plug are red, black, yellow, it seems that they are likely to follow a standard atx power supply style color scheme.  Black would be ground, red +5v to power on-board ICs, and in this case the yellow is probably 26v since that is what the monitor requires (or it could be dual 12v rails, idk for sure).  I put my multimeter on mine and didn't get any voltage so either my meter is bad, or the power supply sleeps when not in use -- I'll need to investigate further to tell for sure. 


    Now, the problem that I have is that someone lopped off the dvi and usb cable on mine.  I'm trying to get the pinout of the 21-pin connector on the mainboard so that I can splice a new DVI cable onto it but the pins don't seem to be active when the power is not on (ie I can't just probe from the ADC to the connector).  Would you be able to do me a solid and probe from the DVI socket to the mainboard connection so that I can wire up a DVI cable?  You can reference the DVI pinout here and just make a mapping of DVI pin --> Connector pin.  You can number the connector pins any way you want, but iirc there are a couple of pin numbers on the board that might give you a clue.  In return, if I get this thing working I can probe those power supply pins to tell you for sure what the voltages are!

  • TheRealAnubis Level 1 (0 points)

    Well, since no one had replied in a while (especially for Apple discussion), I stuffed it in a box and moved it to the storage unit with other junk that I can't seem to throw out.  I'll see if I can track it down and then I'll do the pinout for you.  Sorry it won't be quick, though...

  • crakarjax Level 1 (0 points)

    No worries, I'll just work on mine at a leisurely pace.  I was thinking that I should be able to hook my adc monitor up without a DVI input just to see if the power supply works, but there might be some proprietary stuff that has to happen via usb in order for the monitor to turn on in any case.

  • Malcolm J. Rayfield Level 5 (7,005 points)

    It will work with no USB connection to the adapter, but it does need DVI connected to make the display turn on.


    The display needs 24-28 VDC at 2-3 A.

  • TheRealAnubis Level 1 (0 points)

    Actually, the tote didn't make it to storage yet, so I'm getting this done faster than I thought.. I'm re-checking my pinouts before posting.. Hopefully tomorrow some time!

  • crakarjax Level 1 (0 points)

    Nice! I appreciate the effort

  • TheRealAnubis Level 1 (0 points)

    Ok, here goes - I re-checked all of my test points, so the info is now double checked..


    Here is the socket on the converter - I added the numbers (except for 21):




    Since the pic you linked to was the video card end, I found a blank and reworked the numbers so the pinout is looking directly into the end of the DVI cable that you plug into the video card - This shows pins 1-11:




    And here are pins 12-21:




    I'm hoping this helps you get a cable built so you can test your converter.


    Keep me posted!

  • TheRealAnubis Level 1 (0 points)



    Good to know!  Any info we can get will help us along.



  • crakarjax Level 1 (0 points)

    It works!  Thanks much for the pinout!  I metered the voltages, and they are 5v(red) Gnd(black), 26.5v(yellow).  I don't think a laptop supply would work because of the 5v rail, so your best bet might be tearing into the supply and looking for bad capacitors, and failing that test the transformers.