I'm working on my backup boardset and I've spent hours trying to track down a short to ground on data line 3. Has anyone experienced this before? If so, do you recall what part was causing it? The background is that I've tested all the socketed parts in a known good CPU. They all work fine, but the boardset doesn't pass the buss test using my 9010A. The sound and AVG board work fine too. Any suggestions on how to track this down would be appreciated.
How much of a short are we talking about? Ten ohms or less?
Do you have a good set of schematics? If you're sure about which data line is shorted, you can try two things:
*) Make a list of all components that connect to that data line. Then remove the socketed chips to eliminate those as possibilities.
Now you can concentrate on the chips that remain. With power applied, feel around for one chip that feels somewhat hotter than the others.
Or, with the power disconnected, use your ohmmeter and measure the resistance between that data line and ground. You'll know you're getting close when you find one pin just a skosh lower in resistance than the others that are common to that line.
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Received on Wed Jun 8 00:26:44 2005
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