Re: Messed up my Black Widow

From: Andre Huijts <a.huijts_at_upcmail.nl>
Date: Sun Jul 01 2012 - 18:19:17 EDT

The diode check setting on a DVM is not suitable to measure like this. Use Ohms setting instead. I've done it one or two times and was pretty surprised by the low ohms value read-outs on good working boards. They should not be totally zero though of course.....

Verstuurd vanaf mijn iPad

Op 1 jul. 2012 om 23:50 heeft John Huie <jehuie@sbcglobal.net> het volgende geschreven:

> Thanks for all the tips guys. I think I tried everything you have suggested so far. Here's the breakdown:
>
> 1) Inspected all chips. There are no bent or broken legs. All came out nice and straight.
>
> 2) No obviously damaged sockets. I examined every pin of every socket visually with a magnifier top and bottom. They all appear clean and have clean solder on the bottom.
>
> 3) Can't see any damage to traces under the chips that could be leading to a short. Examined each with a magnifier also.
>
> 4) All roms were put in the correct way around.
>
> 5) When I checked the resistance between Ground and +5, I was just using the "Diode" setting on my meter. With chips in or out. On the board in question I'm getting an immediate beep and the reading is 0.000. On the other board I get no beep and it reads 0.291 resistance. Whatever that means.
>
> 6) Neither board is plugged into the harness when I'm checking this.
>
> 7) Thanks for the chart Jordan. Now I see where I screwed up. Step one!
>
> Any other ideas? Oh and David, if you can hit me up privately and let me know what you charge to repair these that would be great. I've got two that could use repair.
>
> John

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Received on Sun Jul 1 18:19:08 2012

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