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belgaonkar

PM/WS 8500 needs AV module to boot?

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You may also want to inspect/compare mobos. While the one that came with the dual cards is a stock part, it may be modified to put out more voltage.

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A month later, but no success. I have no idea what I'm doing lol. 

 

Everything suggested has been tried, it has to be an issue with the card, all other combinations have been tried. Processors don't look visibly damaged, but that doesn't really mean anything.

 

As mentioned the card does get very very toasty, so maybe it cracked a solder joint? They used the same heatsink as a production machine with one processor and expected it to cool two processors.

 

Anyone interested in taking a look? Im very skeptical to do this after the last incident.

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Neat thread.  So if I understand this correct when you put a stock 7500/7600/8500 CPU card in the machine boots?  

 

You have to love those cases these days, so brittle.  I hope you found better case parts for it. I have an 8100 and the case is falling apart.  Every time I move it something inside breaks.  Ugh, these cases might as well have been made out of potato chips!

Edited by Zippy Zapp

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Im home for winter break, and I finally got a chance to look at this old Proto. It booted once and then goes back the issues I was having before. Im 90% confident it needs to be re-flowed to be perfect? Any suggestions for places to get this work done? Not going to risk it and bake the CPU in an oven.

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2years later... It's been sitting in the basement and i've decide to take a look at it again. I have all the proto parts back in the machine. I was only ever able get it to post once and that was by fluke. Im gonna start from the beginning. Hopefully it's something stupid like a PRAM battery, but I feel like I would have checked that before.

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Hi, 

 

I have a working 8500 and a WS8550 that wasn't booting. No chime, just fan and hard disc spin. I thought it was the motherboard because of the battery leak, I found a new MB in perfect condition. No luck, same symptoms. It turns to be the processor card. I put the 8500's processor card and it started. I found 2 cheap processors card and one of them was defective. When processor card is defective, there's no boot chime, just the fan and disc spinning, nothing on screen. I really don't know how to check the processor card outside the computer. I can also assure you that the 8500's doesn't need the AV cable to be plugged in nor the PRAM battery to boot. 

 

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processor card would do the trick.  The one you have may be salvageable.  The capacitors could have just gone past the point of doing what they need to do, like every other motherboard of this age these days.  Try a different card, if its posts you will have narrowed the search.

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