What are the pinouts for the USB 2.0 headers on an HP AAHD3-HB (Hibiscus) motherboard?

[JourneymanMike]

I recently had taken the guts out of my HP Pavilion p7-1154 desktop and placed them in a different case. The reason I did this was for more room, better cable management and better cooling. When I got the components in to the new case,  I started to make all the necessary connections for everything to run properly.

When I got to the Front USB 2.0 headers, there was a difference in  pinouts. They have two extra pins, which, in the HP case are covered by an extra two-pin connector hanging on alongside the normal USB connector.  My new case does not have this extra two pin connector and therefore does not work! What do these two extra pins do?

Here is the USB 2.0 Pinout connector config on my new case

 

The pinout on the HP AAHD3-HB (Hibiscus) motherboard has two extra pins below 9 and 10. They are covered by an extra two-pin connector alongside the regular connector.  Are these extra ground pins? If not what is their purpose? I would like to get this machine working in the new case.  Any comments or suggestions?

Here’s my computer –

HP Pavilion p7-1154

Product # QP773AA#ABA

HP motherboard AAHD3-HB (Hibiscus) made by Pegatron - the stock motherboard.

16GB Corsair Vengence 1600 ram

Silverstone 500W 80 Plus Bronze Certified PSU

AMD A8-3850 APU  - 2.9GHz (stock) running @ 3.6GHz (overclocked) using AMD OverDrive

Radeon 6770 1GB ddr5 GPU - I could not employ AMD Dual Graphics on this MB

2 - Crucial M4 256 GB SSD's in Stripe (RAID 0)

1 - WD VelociRaptor 10,000 RPM HDD

Windows 7 Home Premium 64 bit OS

Thank You,

Mike

[Big_Dave]

Hi Mike,

The new case looks like a typical dual USB 2.0 header.  Pins 9 and 10 are unused and are just for alignment.

Is your question related to the extra two pins on the HP header connector?  Good question!  Trace out the header from the old case. Where do those extra two wires go?

[JourneymanMike]

Dave, thanks for the reply.

I did just that after I made the original post. I unplugged the USB 2.0 and the HD Audio connector - then took the front panel off - and removed the front USB/Audio jack unit and pulled the cables through and out of the case. The two extra wires are black and one wire goes to each USB 2.0 input jack. Another ground perhaps? I did not want to take the unit apart to see.

When I put it back together I did not reconnect the two seperate black wires - and it still works!! No problem.

This makes me wonder if there is a problem with front USB 2.0 jacks on my new case. (I may have an RMA on my hands) Maybe I'll reinstall in the new case and try to figure it out. I have some time on my hands!! Ha! Ha! I'd still like to know the purpose of the 2 extra black wires.

You can see a diagram of the motherboard and some of it's pinouts below. There are three USB 2.0 headers - one single for the card reader and two double, one is used for the front USB and the other is open.

 

Thanks for your help. I’ll post back later. Any other thoughts on those wires are welcome.

Mike

[Big_Dave]

Hi,

Perhaps the two extra wires are for charging when the PC is powered down.  The mobo is used in other models.