Re: Dell Motherboard replaced caps still no boot

Mike,
When you reCapped the Dell Optiplex - did you nick the video trace that is around the pad of cpacitor C259? The trace is a hair like trace (one of the squiggly traces) that comes really close to the pad...
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When I get a motherboard that does not display video on preliminary BIOS Boot (I always pre boot the motherboard before working on it - it also tells me if it is an easy fix, or more detailed) - I always pop in a new 1500 uF 6.3V Cap in this location. 90% of the time the video comes up and I proceed...

Re: Samsung SyncMaster 913v

First of all - Dave's First Rule of Electronics Repair
applies here:::::::
IT IT TAINT BAD - WHY FIX IT!!!!!!!
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Poking around where there is no problem doesn't necessarily find problems - it creates them...
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To answer your question "Do I have Bad Caps?"
I would say no.
Do you have bad caps that could go bad? " Really now - are we playing the chicken and egg scenario???
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Yes you may have capacitors that could go bad - but they are obviously working now.
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Re: Railway locomotive mother board

ROBES,
First of all...
What series Locomotive is this for?
ie GE GP4????
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How about a few pictures???
And a few pictures of where and how the component is mounted in the Locomotive?
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what is the component designation (the letters on the Circuit Board tag/label)?
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Excessive Solder on a GPX Series Locomotive Control Module Main Board (we in the computer industry call them motherboards - those in the electric locomotion field call them Locomotive Control Modules) is not...

Re: Bad Rubycons...

Super Nade,
The Capacitor (C259) is the filter cap for the board video chip set.
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You should also replace C257 and C258 as well. If one of these caps is bad, then the other two are most likely bad (or will fail shortly).
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By the way you also need to replace C392 and C1194 (on the other side of the Memory/DIM slots). These should be 1,800 uF 6.3V 105 degree Caps with a dimension of 8mm x 20mm and 3.0mm lead spacing.
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The other high failure caps are the 1,800 uF 6.3V caps located between the CPU and Regulator...

Re: SX280 Bad Capacitors

PCBONEZ has it right..
The p-4 looking connector is where Dell connects the hard Drive and CD Rom Drive power leads to..
They have a 4-Pin to SATA/HDD Molex connector adapter...
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In the Normal P-4 PC World an ATX P-4 Capable Power supply would have a 20-Pin and a 4-Pin power lead for the motherboard.
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In the SX series of Dell Computers - the motherboard has a DC/DC Converter that supplies the Aux 12VDC power for the P-4. (Incidentally, this was a source of heated discussion in the original P-4 Specifications...