Re: Re: MCR II issue

  Thanks for the steps here Peter/Rodger. I'll be looking into this
some more today, after I trace where each leg of the buss is actually
going. One of them is off the board already, still shorted.

  As far as the heating/smoking method, what I am hearing is to connect
to the suspect board using the +5/GND pins on one of the 24pin headers,
correct? Apply juice until something is obviously warm or actually
fries from the current.
  Is this most likely to be quick, like a fuse upstream of a short? I
am wondering if I will miss it and then it comes down to finding the
damaged item, or if it will take at least long enough to actually see
the component die. And I take it the beefiness statement refers to the
PSU being able to output high current w/o shutting down, or frying itself?

  As for replacing the busses, is plain wire gonna serve the purpose, no
need to worry about the possible frequency shielding of the original
(flat metal "bars") setup?

Rodger Boots wrote:
> Actually, if you're going to remove the busses I'd check each row for
> shorts BEFORE reconnecting everything. It's rare that you would have
> a chance to have everything disconnected in bite-sized chunks, might
> as well use it to your advantage.
>
> peter jones wrote:
>> remove the bus's if they are damaged,
>> then see if your short is gone.
>> if it has then put good wires inplace of the busses and check again.
>> if your lucky the short will be gone.
>> if not then it's gonna be a bitch.
>>
>> 1st you check under the board for bent pins & solder bridges,
>> then you check anything socketed to make sure nothing is in the wrong
>> way.
>>
>> then it gets nasty.
>> you can use a very beefy psu to try to "smoke" the short or a
>> variable current supply to heat the short so you can find it.
>>
>> it will probably be a chip or ceramic capacitor.
>> ram chips are good initial suspects in these situations.
>>
>> this isnt mcr advice btw, it's general - i'v seen it on other games.

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Received on Wed Oct 24 11:53:54 2007