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Re: [TCLUG:7853] dead motherboard?



Tim Wilson wrote:
> 
> On Wed, 25 Aug 1999, Schoenhofen, Kelly wrote:
> 
> > Well, in my experience, any short will stop the cpu fans and usually the
> > power supply fan. As far as no beeps or nothing - speaker work? plugged into
> > the motherboard? I'd pull out all the cards and ram, and see if you can get
> > it to make a sound. It's a compaq, so there is likely going to be onboard
> > video & such, so if something integrated literally burned out there is a
> > good chance the system is a complete loss.
> 
> I did pull everything out, including drives, memory, etc., just trying to
> hear a single beep or something. There are very few jumpers on this
> motherboard. They basically just do the settings for the CPU. (I'm sure
> the settings are right.) There isn't any onboard video on this machine.
> 
> I did just notice that the keyboard lights flash when I turn on the power.
> I check for loose screws...no improvement.

You said that you've got the bipolar 12 and 5 volt rails from the power
supply, but have you looked at ripple on those lines?  Just a thought...