Home-built Computers AGP slot failure? Asus P4P800SE

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Subject Author Date
AGP slot failure? Asus P4P800SE E 05-29-08
Posted by E on May 30, 2008, 10:21 pm
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Mike Ruskai wrote:

> It certainly sounds like a failure of the AGP bus, based on what you say. I'd
> take a good look at the thermal situation before putting it back together with
> a new MB.

Currently full size ATX case with 120mm fan blowing out the back.
Maybe add an intake fan.

Posted by still just me on June 2, 2008, 4:13 pm
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wrote:

>My current thinking is that the AGP slot has failed. I didn't see
>any obvious blown capacitors around the AGP slot. I may try a
>third AGP card in the slot before I go to something else. If this
>is the case, I will have to change out the mainboard, maybe even
>consider building another system from scratch. The user is tight
>on funds now, so I may have to find a good working replacement
>mainboard.
>
>Thanks in advance

My experience is that SIMS drives the system very hard. I've seen the
system box get very hot with SIMS and a ATI Radeon and I run the box
with push / pull fans.

I'd wager the mobo burned something. How's the ventilation in the
case?

Posted by Franc Zabkar on June 5, 2008, 2:44 am
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put finger to keyboard and composed:

>Hello
>
>I have PC where an AGP video card stopped sending a signal to a
>flat screen monitor in the middle of playing the Sims 2. The video
>card and flat screen monitor where linked via a standard VGA
>cable. The user says that the screen froze, or went black in the
>middle of a game. This happened only an hour after installing the
>game. The machine now has no display, during POST, or booted into
>full graphics mode. Before I troubleshooted anything, I knew it
>was properly booting into Windows because I could hear it through
>the speakers.
>
>This is an Asus P4P800SE motherboard, with an e-GeForce 7600GS,
>256MB DDR2 AGP video card.
>
>To troubleshoot, I connected the PC to a known working CRT
>monitor, and also changed out the AGP video card. No signal in
>either attempt. I did however get a PCI S3 video card to work, and
>then checked out a few things in Windows. The machine did not
>'crash' or blue screen per say, so it did not leave a minidump
>file. There is nothing wrong in device manager. Nothing of
>relevance in the system logs. It is interesting to note that if an
>AGP card, and the old PCI S3 video card are installed in the
>system together, there will still be no signal from the PCI S3. It
>must be by itself.
>
>My current thinking is that the AGP slot has failed. I didn't see
>any obvious blown capacitors around the AGP slot. I may try a
>third AGP card in the slot before I go to something else. If this
>is the case, I will have to change out the mainboard, maybe even
>consider building another system from scratch. The user is tight
>on funds now, so I may have to find a good working replacement
>mainboard.
>
>Thanks in advance

If the AGP card is not failing the POST, and if the PC is making all
the right boot-up noises, and if there is evidence that it booted up
fully (eg updated date/time stamp on a particular file at the end of
the boot sequence), then it would seem that there is something wrong
with the analogue section of your AGP cards. If all cards exhibit this
problem, then this would suggest that the relevant voltage (+5V, +12V
?) is not making it to your AGP slot.

With power removed, I'd use the following pinout diagram and a
multimeter to perform a continuity check between each power pin in the
AGP slot and the respective power pin in the ATX connector:
http://pinouts.ru/Slots/agp_pinout.shtml
http://pinouts.ru/Power/atxpower_pinout.shtml

The 1.5V supply would be derived from an onboard regulator.

With power applied, you could also measure the horizontal and vertical
sync pins in the 15-pin D-SUB VGA connector (one may be 0V and the
other may be 5V), and check pin 9 for +5V:
http://pinouts.ru/Video/VGAVesaDdc_pinout.shtml

Also check the RGB pins. For example, if your desktop is mainly blue,
then this will be reflected in your measurements.

If the card and monitor have a DVI output/input, then try that:
http://pinouts.ru/Video/dvi_pinout.shtml

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

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