is nichicon hm compatible with ucc kzg?

[momaka]

Re: is nichicon hm compatible with ucc kzg?

The real problem with bad caps is bad QC. That's how people can have so many inconsistent experiences with them. At the very least, though, replace those KZGs.

I agree 100%.

Even capacitors on the input of a buck regulator can cause irrevocable damage to whatever chip that DC-DC converter is powering if they go bad (the CPU in this case).

Well, this is less likely to happen to the CPU VRM, since it usually has a more advanced chip than your typical PWM controller. But I agree that capacitors on the input of a buck regulator indeed should not be deemed less important than the output.
As you know (I'm sure I mentioned it more than once ), I've had a router die from bad caps on its buck regulator input. And that's just once instance off the top of my head. Had a few other similar cases in other devices.

[Wester547]

Re: is nichicon hm compatible with ucc kzg?

I wouldn't say I know better than anyone else. My standards for "reliable cap" might be a bit more rigorous than some. Those Nichicon HNs don't have vents so I think they would be more likely to quietly dry out through the bottom rubber bung. I don't see a 680uF 4V value in the datasheet (they could be a custom order). They are in parallel with polymers so you might get away with leaving them. But if you really want to replace them, it would be interesting to see what the rubber bung actually looks like (hopefully not a concentric bung!) so as to verify the genuineness of those capacitors.

Everyone's standard for a reliable cap is bound to be different, especially since everyone has different experiences with different brands and series. Some people haven't had a problem with KZGs or Teapo, others wouldn't chance "relying" on them if their lives depended on it. The real problem with bad caps is bad QC. That's how people can have so many inconsistent experiences with them. At the very least, though, replace those KZGs. Even capacitors on the input of a buck regulator can cause irrevocable damage to whatever chip that DC-DC converter is powering if they go bad (the CPU in this case).

[momaka]

Re: is nichicon hm compatible with ucc kzg?

Also the board has a fer nichicon hn 820uf 4v next to the cpu. Their manufacturing date is a0511. Are they bad hn series nichicon manufractured back in 2004?

That's a 2005 year Nichicon, week 11.
2005 was a "transitioning" year for Nichicon HM and HN capacitors. Some caps from 2005 do end up being bad, others are okay. I think week 11 is a pretty early, so those may be more likely to have problems. I'm not an expert on this matter, though (I think Wester547 might know better... let's hope he sees this thread and chimes in.)

Rest of the caps on the board are rubycon mbz.

Those should be good.

[nick122]

Re: is nichicon hm compatible with ucc kzg?

Also the board has a fer nichicon hn 820uf 4v next to the cpu. Their manufacturing date is a0511. Are they bad hn series nichicon manufractured back in 2004? Rest of the caps on the board are rubycon mbz.

[nick122]

Re: is nichicon hm compatible with ucc kzg?

Thanks! I'll recap it tomorrow.

[momaka]

Re: is nichicon hm compatible with ucc kzg?

Yes.
Nichicon HM is a direct replacement for Chemicon KZG, especially the 16V 1500 uF 10x20 mm size.

Also, I see your Nichicon HM caps have a H06xx datecodes. That means they were manufactured sometimes in 2006 - which is good, because Nichicon HM and HN with datecodes between 2001-2004 and some from 2005 had problems. 2006 and newer is fine, though.

[nick122]

I have a few ucc kzg 1500uf caps on my old 775 mobo. Are they compatible with nichicon hm?