Help figuring out power switch pins

I just bought a dell t3600 motherboard, and I am making a system to use the cheap xeon 2670. I have assembled it outside of the case, and I am trying to power it on with no success. There is a 28 pin connector with 1 pin removed that is labeled "frontpanel_usb1" and all of the online manuals say something similar. There is nothing printed on the motherboard or any pinout information in the manuals. I have tried shorting out the pins with a screwdriver with no pair working. However, the power supply fan and my cpu cooler fan (plugged into power supply, not motherboard) spin for part of a second when two of the pins are bridged. Clearly the motherboard is sending some sort of signal to the power supply, but it isn't starting the system. I have tested the power supply.

I am wondering if anyone could help me with the pinout of this 28 pin connector, tell me how to determine which two pins are for the power switch by using a multimeter or some other method, or tell me if these are the right pins and something else is wrong with the system.
Thanks.
6 answers Last reply
More about figuring power switch pins
  1. Any pictures?

    i found this website,not sure if it will help

    the one with a blocked pin is the usb block style connecter

    https://www.manualslib.com/manual/624299/Dell-Precision-T3600.html?page=4
  2. AppleGwava said:
    Any pictures?

    i found this website,not sure if it will help

    the one with a blocked pin is the usb block style connecter

    https://www.manualslib.com/manual/624299/Dell-Precision-T3600.html?page=4


    The connector is number 27 on that diagram, and I do have a picture. I had some difficulties getting a link or image in this post, so I hope this works. https://sites.google.com/view/28pinconnector
  3. it might be that the dell board need always on/off switches,not the momentary bridging of the pins

    while rummaging i did fine these threads

    http://www.tomshardware.com/answers/id-2317480/dell-precision-t3500-custom-case-power-supply-panel.html

    https://www.reddit.com/r/pcmods/comments/3x3784/years_too_late_everything_about_dell_front_panel/


    you could also try to search dell front panel pinout on google.Not much time for me now as im still a student :(


    also from my research,it contains the basic front panel and a usb 2.o bock style.The blocked pin should correspond to the usb,which cuts down the guessing work

    or else it should be the middle two
  4. Hmm, I knowing that that part is the usb would narrow it down, but I think at this point I will just order the whole front panel from the machine. They are a lot cheaper than I thought. Anyway, thanks for your time and help.
  5. Dan is the man said:
    Hmm, I knowing that that part is the usb would narrow it down, but I think at this point I will just order the whole front panel from the machine. They are a lot cheaper than I thought. Anyway, thanks for your time and help.


    did the front panel was enough to make the mother board work outside the case?
  6. Dan is the man said:
    Hmm, I knowing that that part is the usb would narrow it down, but I think at this point I will just order the whole front panel from the machine. They are a lot cheaper than I thought. Anyway, thanks for your time and help.

    I had the same question as the @bludragon05 did your motherboard starts with just front panel?
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