Epox 8RDA Recaps

[gdement]

Re: Epox 8RDA Recaps

I had some KT133 boards from ebay once which had some KMG caps on them. Seemed to work okay, but they wouldn't be the best choice normally because the performance specs are pretty low. If you were in an emergency you might get away with using them, but only on less demanding board locations, definitely not on Vcore.

[linuxguru]

Re: Epox 8RDA Recaps

NCC KMG is 105c, but GP (General Purpose), not low ESR. They're OK for low-ripple current bypass applications, but probably not at the VRM output. However, I've seen 2200uF/10v/10mm KMG in a number of boards for Vcore bypass, etc. - this is probably a cost-saving shortcut similar to the old trick by Gigabyte of using Choyo or GSC 330uF/25v everywhere on their mobos.

[davmax]

Re: Epox 8RDA Recaps

My experience with 8RDA+ is that because the VRM input caps sit right on the MOSFETs they get very hot and are therefore short lived. It is best to place longer life caps here such as 12.5 mm Rubycon ZL or Panasonic FM. Otherwise place heatsink cooling on the MOSFETs.

[Alladinsane]

Re: Epox 8RDA Recaps

I just got the caps this week and got them in yesterday- the panasonic FMs. Unfortunately and as crazy as it may seem, although the system/mobo works fine, the 2200 have already started to bubble/expand/go bad. Is it possible I got a bad batch? Or did I screw something up somehow? The system works fine- tested it with some 3d apps with a 9800 and it performed flawlessly.

[willawake]

Re: Epox 8RDA Recaps

yes it is likely that you either installed them with wrong polarity (always trust the polarity of the original caps on the board not the markings on the board). Or you have used caps with lower voltage than before.

[davmax]

Re: Epox 8RDA Recaps

Seems like reverse polarity. The caps are ruined. Replacing 10V caps with 6.3V on a motherboard is safe.

[Alladinsane]

Re: Epox 8RDA Recaps

so I guess I should just toss them and get buy some more ?

[gonzo0815]

Re: Epox 8RDA Recaps

Yep, but you can chek polarity first (with DVm and board running out of the case to reach the bottom side), if you like to know the cause of your problems.
Any way, i do not expect to mutch faulty FM in one package.

[davmax]

Re: Epox 8RDA Recaps

The secret of successfully recapping is observe the polarity of the first cap you remove and note the marking standard used by the manuafcturer. A white or black half circle is used to note the polarity. Unfortunately this differs with manufacturers so each motherboard or power supply must be checked. Then double check as you install the new component.