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P4S533 USB header pin assignments
condraj wrote:
I've been trying unsuccessfully to connect two front-panel USB ports to the extra USB header on my P4S533. I have the two extra rear ports (that came with the motherboard) connected to header USB2 and they work fine. However, connecting the unused header, USB3, to the front ports doesn't work. I've tried switching the USB2 and USB3 connections, and either header will work with the original (rear) port card, and neither will work with the front port. I have the front connector wired according to the pin assignments in the P4S533 manual: Red: USB power White: USB - Green: USB + Black: GND Gray: OC1# In reading a thread on another newsgroup, I found a person with a similar problem who solved it by reversing the white (-) and green (+) wires on his front port connectors. If that really works, then I'd have to conclude that the pin assignments listed in the motherboard manual must be incorrect. Before I try reversing the + and - connectors on my USB port (and perhaps fry something in the process), I wanted to see if any of you has any insight into the problem. Has anybody succeeded in connecting USB2 or USB3 to an additional port? If so, what pin assignments did you use? Thanks much. Jon I successfully connected an Antec EasyUSB 2.0 unit to one of the motherboard headers on my ASUS P4S533. The default wiring that came with the unit didn't work at all. In fact, hooking it up disabled all my USB ports. The antec unit's cable had the following pinout: red: 6 1 :empty white: 7 2 :yellow green: 8 3 :grey black: 9 4 :black key:10 5 :blue Looking at the small circuit board where the USB ports are attached, pins #6 and #1 are connected (USB POWER) and pins #9, #4, and #5 are connected (GND) Aparently, on the P4S533, pin 5 is something special called OC1# that doesn't like being connected to ground. So after looking at the USB pinout from my P4S533 manual, I decided to modify the USB cable by moving the blue wire from pin #5 to pin #1. I could have also just removed it completely but then I would have had to cut the wire or insulated it with tape or something. Moving it was just easier and it gives me a dual USB power wire. new pinout: red: 6 1 :blue white: 7 2 :yellow green: 8 3 :grey black: 9 4 :black key:10 5 :empty Now it works like a charm. .... Krick |
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