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Video Fails on AT Motherboard

By epoe ·
I?ve got around 400 Pentium 133/166es. Every few weeks, I get a spate of 2 or 3 computers whose video completely dies. When booting the computer, the HDD will spin up, no POST beeps, and it doesn?t sound like the computer goes into Windows. I?ve replaced the video card, other cards, power supply, BIOS, BIOS battery, processor, and RAM to no avail. I?ve pulled the motherboard out and just had it on the table with a video card, keyboard, power supply, RAM, and processor; still no video. I?ve beenfixing the problem by replacing the motherboard. The dead/dying motherboards are AOpen AP53?s and AP5VM?s. I have not had this problem with my other 550 non-Pentium 133/166es.

Can you think of why this would be happening? Can you think of any additional troubleshooting steps that I should try?

Thank you in advance.

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Video Fails on AT Motherboard

by mphoffar In reply to Video Fails on AT Motherb ...

Most of the time when I see this it's because the chip is not seated all the way. I had something similar happen to me...what happened was the lever for the ziff socket came up enough for me not to notice it, but enough to unseat the chip.

Hope that helps...

Mark

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Video Fails on AT Motherboard

by epoe In reply to Video Fails on AT Motherb ...

MPHoffar,

Thanks, but I had already tried pushing in the ZIFF socket.

Thanks for your assistance,
epoe

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Video Fails on AT Motherboard

by dcosgrove In reply to Video Fails on AT Motherb ...

Are these hp vectras? If so you need to get drivers from the hp web site. It's been years since I worked with them but I recall havind the same trouble with a batch of v/100s they had S3 video chips.

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Video Fails on AT Motherboard

by epoe In reply to Video Fails on AT Motherb ...

Thanks, but these are not HP Vectras. These are no-name clones.

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Video Fails on AT Motherboard

by kiwimagic In reply to Video Fails on AT Motherb ...

I don't know these machines, so my answers are generic.
a) Check for loose I.C.'s, in the dud system boards
b) I'm thinking, how hot (temp) are these boards running? A fan?
c) Do a voltage check on power supplies of failed machines, and also check a dozen or so working machines. You didn't mention testing old power supplies, so if these are spiking the system board, could be killing off the bridge and asociated chips.

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Video Fails on AT Motherboard

by epoe In reply to Video Fails on AT Motherb ...

Thanks Kiwimagic:
a: nothing was loose.
b: the boards are relatively cool. Fans galore, cold (15-degree C) rooms.
c: The voltage check is a good idea. This has also happened on newer power supplies.

I'm thinking the problem might have something to do with static. A kid in one classroom was showing his minions how he could build up a static charge and discharge it on the key-lock of the tower! That effectively fried the computer with the same result as the other dead computers.

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Video Fails on AT Motherboard

by xj0 In reply to Video Fails on AT Motherb ...

if the same problem keep reapearing in different machines and differnt floors then it most probably a power problem in the building check how good is your powers surges and UPS.
Good luck

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Video Fails on AT Motherboard

by epoe In reply to Video Fails on AT Motherb ...

Xj0, Thank you for your suggestion. All of our computers are on surge-protected outlets and this is only happening on a specific model-year of computer.

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Video Fails on AT Motherboard

by epoe In reply to Video Fails on AT Motherb ...

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