Thanks for the quick reply. The closest thing to a o-scope I have is the 
PC sound card plus Zeitnitz's software
http://www.zeitnitz.de/Christian/index.php?sel=scope_en
Would have to make a voltage divider to get the 5 volt down below 1 
volt, but that's no problem. Do you think that will work. The other 
quick option is, I have a couple of 1000ufd caps (that's the present 
value), they are larger, and have leads out both ends (existing ones 
stand up on the PCB), but I could temporarily solder them in to see what 
the effect is. Otherwise I would have to order from Mouser or someone.

I had previously looked at all caps for bulging, or other deformation, 
and there is none.

ps: will be gone from the PC for a couple of hours, then around for most 
of the day.




enkitec@gmail.com wrote:
> Carl Denk wrote:
>   
>> Disconnected cable from power supply board to video board, and the 5 
>> volt supply measured at 5 volts. Used a 20 ohm resistor to create a 1/4 
>> amp load, still had 5 volts, changed to 10 ohm resistor for 1/2 amp 
>> load, and the 5 volt was back to a couple of tenths volts. I'm assuming 
>> that some regulator chip is shutting down due to over current, but am at 
>> a loss where to go from here.
>>   
>>     
>
>     Suggestion:
>
>     Verify ripple at 5V output at 20 ohm load.
>     If excessive, replace the 5V filter capacitors.
>
>     Mark Jordan
>   
>   
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