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May 13th, 2024 04:01
Dell Precision Tower 3620 - Front USB 3.0 I/0 header pinout
Hi, I'm wondering if anyone can provide me with a pinout for the front USB 3.0 header. I installed a GPU that's so large that the header is completely covered up, and I cannot install the front I/O cable. Without the cable, the system gives you an error message that does not allow the machine to boot. I'd like to short the Front I/O Cable Detect pin (if it has one) to ground. The plug looks like this:
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redxps630
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May 13th, 2024 12:22
it should be standard usb 3 20-1 pin
JOcean
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May 13th, 2024 16:24
In addition to the detailed information from @redxps630 would an adapter such as this one at Amazon help (I cannot tell from the picture).
gravyishot
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May 14th, 2024 17:58
@JOcean Thank you for your reply, unfortunately there is no physical space under there for even an adapter that is as small as that one.
gravyishot
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May 14th, 2024 18:00
@redxps630 Thank you, I think you are correct. It doesn't seem to have a specific pin to sense whether a cable is connected, so I'm not sure if something could be grounded to trick the bios into thinking that the cable is installed.
valentinmtl
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June 17th, 2025 14:08
I just tested on my 3620, when I unplug the USB 3.0 cable from the header, it gives the Front I/O Cable Failure error at boot.
If I ground Pin 10 (ID), it does not complain.
For the test, I just used an alligator clip attached to the plastic of the header and touching the pin. The other end clipped to the chassis.
For a more permanent solution, you can probably solder the pin 10 to a ground pin nearby on the back of the motherboard.
To be safe(er) you can connect pin 10 to ground through a resistor.
I did not have a lot of resistors on hand. A 25K did not work. A 5K did work.
valentinmtl
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June 17th, 2025 16:15
To bypass the other Front IO cable, labeled #30, I had to connect pin 20 to ground.
Unlike the Optiplex, grounding Pin 8 was not enough. You can connect Pin 8 it to ground, or not, it did not seem to matter. The original Front Panel cable has the ground wires connected to 7, 8, 17, 18, 20.