| IIcx Powers on, but no Signs of Life [message #337201] |
Sat, 11 February 2017 22:25  |
Wesley Furr
Messages: 79
Registered: September 2012
Karma: 0
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Member |
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I have a IIcx whose motherboard got destroyed by a leaking battery. I
acquired a motherboard for it that was of unknown condition. Clearly needed
capacitors, so I removed them soon after receiving it, but then haven't
gotten around to working on it since then. I think I posted some questions
here a while back about a bad trace. I managed to patch that back up and
the volt meter indicates it has continuity through that point now, so I
think that is good. One other trace looks questionable, but doesn't look
too bad...and I'm having trouble figuring out where to put the meter to test
it out to see for sure. I then replaced all the surface mount capacitors
and tried it out. With only power connected, I can push the button on the
back and it powers up, but I do not get a chime. Tried connecting a VGA
monitor to the 8-24-GC video card via an adapter, but still nothing. If I
press the reset button on the front, I can hear a slight noise out of the
speaker like it is resetting. Tried the power supply out of a Quadra 700
that I have sitting here (that doesn't work either, I forget the symptoms
now), but it behaves the same way. Tried pulling half the ram, swapped it
with the other half, no dice either way. Unplugged all drives...everything
I could think of to try... Video card chips get warm, CPU does not seem to
be getting warm.
It does not have a PRAM battery installed, but I understand that is not
required for the IIcx to function?
What are the odds that one of the axial electrolytic capacitors is causing
this problem? I have not replaced those yet. I hesitate to throw any more
time and money at it unless I'm fairly confident I can get it going...
Any other thoughts?
Thanks,
Wesley
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| Re: IIcx Powers on, but no Signs of Life [message #337207 is a reply to message #337201] |
Sun, 12 February 2017 02:20  |
Jonathan Morton
Messages: 188
Registered: January 2013
Karma: 0
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Senior Member |
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> On 12 Feb, 2017, at 05:25, Wesley Furr <wesley@megley.com> wrote:
>
> What are the odds that one of the axial electrolytic capacitors is causing this problem? I have not replaced those yet.
Frankly the axial electrolytics are more likely to go wrong than the surface-mount ones. Fortunately, replacing them should also be easier.
- Jonathan Morton
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