Dellcapacitor replacement theory?

[eppidrummer]

I have begun to replace caps on about 200 bad gx270 and gx280's. Here is what I am noticing: Most of the bad caps are along the cpu and the blown ones from dell are rubycon mcz series.
Here is my confusion, the recommended replacement is the same cap (mcz).

Are the existing mcz a fake from dell? If not then why cant I expect the same replacement cap to do the same thing-fail?

I have completed 8 boards and all still going strong but if replacing with the same series, strong for how long?

Thanks!

[mockingbird]

Re: Dellcapacitor replacement theory?

No. Most likely either:

1) The failure of the Nichicons caused a cascade effect
2) The power supplies are defective and killed the Rubycons

[Scenic]

Re: Dellcapacitor replacement theory?

3) Heat

[eppidrummer]

Re: Dellcapacitor replacement theory?

No. Most likely either:

1) The failure of the Nichicons caused a cascade effect
2) The power supplies are defective and killed the Rubycons

Is it worth upgrading anything in the power supplies?

[mockingbird]

Re: Dellcapacitor replacement theory?

There should be "Ltec" or other substandard Taiwanese caps in there.

These PSUs are not easy to recap. You're going to have to take it apart, and desolder wires, so if you plan on doing this, you better have a good topographical sketch before you start so you can remember how to put it back together. The soldering on Dell OEM PSUs is also sloppy on the bottom, so you have to make sure not to bridge something that should not be bridged. Lastly, you're going to have to cross reference Teapo and LTEC spec sheets to find suitable replacements.

These PSUs are difficult to recap and I have never done it for these reasons.

[eppidrummer]

Re: Dellcapacitor replacement theory?

There should be "Ltec" or other substandard Taiwanese caps in there.

These PSUs are not easy to recap. You're going to have to take it apart, and desolder wires, so if you plan on doing this, you better have a good topographical sketch before you start so you can remember how to put it back together. The soldering on Dell OEM PSUs is also sloppy on the bottom, so you have to make sure not to bridge something that should not be bridged. Lastly, you're going to have to cross reference Teapo and LTEC spec sheets to find suitable replacements.

These PSUs are difficult to recap and I have never done it for these reasons.

Thanks for the input! After that, not sure if I want to try it myself. Have done about 8 boards so far and all still running so maybe just leave the p.s alone.

[mockingbird]

Re: Dellcapacitor replacement theory?

Yea, leave the PSUs unless the fans are dead (These PSUs definitely need to be tended to or else they'll overheat and take the system with them).