What header is this? [PIC]

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What header is this? [PIC]

Postposted on Mon Aug 26, 2013 12:09 pm

Hello,

I'm having hard time identifying a certain header on one of my motherboards. The motherboard is from HP T5565 thin client and the header looks like this:
Image

And volatage values for the pins are as follows (same orientation as the picture):
Code: Select all
3.3     0.05
 0       5
3.3     2.5
 0      2.5
1.5
 0      2.5
3.3     2.5

Any one saw one of those? :)

Thanks, iron
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 12:31 pm

Last edited by gigafinger on Mon Aug 26, 2013 1:13 pm, edited 1 time in total.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 1:12 pm

The wiki article suggests there should be 10 pins for HD Audio. Also, the mobo has the front audio panel hard-wired (the motherboard fits the case perfectly, all the front and back ports, panels, LEDs, buttons are on the board.)
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 1:13 pm

I edited my post. Looks like it's a second serial port.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 1:35 pm

Hmm, it does, according to the wiki site. But DE-9 header has 10 pins and DB-25 has 26. But it does look like some RS232 connector.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 1:48 pm

Voltages are all wrong for an RS-232, if properly implemented.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 3:49 pm

It does not appear to have the correct number of pins for any of the typical motherboard headers (USB, COM, LPT, TPM, FireWire, FP Audio, etc.)

It may be for a proprietary peripheral of some sort, or even for factory use during testing of the motherboard.

Edit: Another possibility is that it is an analog VGA connector.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 4:01 pm

Cybert said: Capitlization and periods are hard for you, aren't they? I've given over $100 to techforums. I should have you banned for my money.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 4:05 pm

maxxcool wrote:http://www.fabiatech.com/a/file/product/105051523200.pdf

I don't think that's it. The "CN5" connector in that manual has a different number of pins, and I don't see an adjacent CN6 in the photo in the first post.

I'm going with my "analog VGA" guess.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 4:27 pm

Header for a TPM module?

Edit

Just looked at the one on my board, its not it
Image
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 4:39 pm

Actually, it could be VGA. The system has two DVI outs by default, one DVI-I, one DVI-D. No VGA. Considering VGA standard will never die, it could be it, just hiding. :)
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 4:49 pm

Analog VGA has 15 pins, but 5 are grounds, so the 13 pins on that header would theoretically be sufficient. According to your first post, 3 of the pins are sitting at ground potential, which would be consistent with them dropping 2 of the redundant grounds. Furthermore, one of the pins on an analog VGA connector is supposed to be connected to the +5V rail, and you've got one pin that is sitting at +5V.

I'd say we have some good (but not conclusive) evidence that points to it being an analog VGA connector.

Edit: Just out of curiosity, is the header physically near the DVI-I connector? That would be the logical place for it if it is an analog VGA header, since the DVI-I port also has VGA-compatible analog signals on it.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 5:20 pm

I'm thinking serial: http://www.mytinywiki.com/index.php?tit ... hin-Client

Assuming they are similar at all -- but the pinout looks the same. It's not RS232 but since it's labeled "eventual" perhaps it's some proprietary thing?
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 5:31 pm

Well, it is. Its near the rear panel, right behind DVI and DB25. But it's also right next to VIA VT1211 chip, which is a legacy I/O controller. May be a coincidence, considering the two RS232 ports are right next to it, too.
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Re: What header is this? [PIC]

Postposted on Mon Aug 26, 2013 5:33 pm

Waco wrote:I'm thinking serial: http://www.mytinywiki.com/index.php?tit ... hin-Client

Assuming they are similar at all -- but the pinout looks the same. It's not RS232 but since it's labeled "eventual" perhaps it's some proprietary thing?


The link was mentioned before. We don't know on what info the wiki maintainer based this claim. The header seems not to fit any RS232 outs.
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