Here's another one from a different seller... So am I correct in thinking the ESR resolution is good up to 0.010 Ohms (The correct ESR for that 10V 1000uF Rubycon MCZ should be 0.011 Ohms). If so, then this device is all you need for testing caps and it only cost $20.
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Yeah! Here is the before and after, and a pic of a typical Chinese cap lying about the specs! I think maybe some of the little caps on the 5VSB are bad because this thing has no signs of life. I will work on it more on the 31st and hopefully get it going
Hi P4
the cap that is in it is only rated at 85 deg so I would up grade to 105 deg the peak esr 70 is showing that the cap is within spec (ie 20%+or-)
I would replace it anyway where there any other components blown it the primary side of this PSU? if so you will need to replace them as well then you need to check the secondary side.
the cap that is in it is only rated at 85 deg so I would up grade to 105 deg the peak esr 70 is showing that the cap is within spec (ie 20%+or-)
I would replace it anyway where there any other components blown it the primary side of this PSU? if so you will need to replace them as well then you need to check the secondary side.
Good luck with your project.
Yeah, I will for sure replace all the caps in this thing! I don't trust any of the ones that came in it I will keep this thread updated
I had suspicions about this diode being shorted so I took it out and it measured 1.3Ω both ways and it diode check mode it reads 0 both ways, is it bad? It's an SB560 diode. And I have an SB540, would that be a suitable replacement?
40V vs 60V reverse voltage rating shouldn't be much of a problem, in this case. Judging by the location next to the 5Vsb transformer, i'd say it's a safe bet this is the 5Vsb rectifier
Thanks for the replies Really? Because it got 5VSB but wouldn't power up. I will see how it goes! The SB540 is mounted to a little heatsink that should help
Edit: Woohoo it powers up now! Now I can continue modifying it in confidence
Thanks for the replies Really? Because it got 5VSB but wouldn't power up. I will see how it goes! The SB540 is mounted to a little heatsink that should help
Edit: Woohoo it powers up now! Now I can continue modifying it in confidence
Um, wtf. Maybe it was somehow being rectified some way, but not well.
Or just worked with a very low load? I hope Khron is right in the fact that the reverse voltage is a little lower but shouldn't affect it. After recapping it I plan on replacing the TOBA MUR1620CT with two MBR20100CT's in parallel to reduce some of the heat on that little heatsink...
Was pretty frustrated, I went to put those MBR20100CT's in the PSU, even had them bolted to the heatsink and the legs were too short on them So I left the original one....
Here is the final picture with the new diode, a Panaflo DC Brushless fan, the new caps (Except the -12V and -5V) and I also bent the fins on the heatsinks outwards, I think they will cool better this way. Now hopefully this thing can last in a computer I only trust it up to 200W for long periods of time
Thanks, I'm glad you approve! I don't understand why they don't do that from the factory
Because it adds about a tenth of a cent worth of wear to the machine! Think about it: if they make 10,000 units, that's an entire TEN DOLLARS that they save!
They're easier to ship and package that way, take less space.
Easier to handle in the factory.
Can be reused in other designs where there are tall parts near the heatsinks
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