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Old 10-28-2019, 09:13 PM   #15
cashkennedy
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Join Date: Aug 2011
City & State: Baton Rouge, LA
My Country: USA
Line Voltage: 110v 60hz
I'm a: Hobbyist Tech
Posts: 590
Default Re: Dell poweredge 2600 power supply nps-730ab

I replaced all the startup caps, but that didn't help.

I did notice the startup capacitor for the standby supply (power integrations top244y chip) goes from 5.8v to 0v when I read both pins of the cap with my multimeter, then eventually back to 5.8v after a few seconds. The manual says: A hysteretic internal supply under-voltage comparator keeps VC within a window of typically 4.8 to 5.8 V by turning the high-voltage current source on and off as shown in Figure 8.

So I don't know if that would mean there's a short or something inside the top244y chip, but then why would it eventually return to 5.8v every few seconds?
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Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.
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