DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

[mockingbird]

Re: DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

The lifetime rating on the Panasonic FR is meaningless in this application, in the sense that if the Panasonic FR capacitor is meant to withstand all the ripple of an ultra-low ESR cap, it's lifetime rating wll probably be equal to or less than the ultra-low ESR cap. Moreso, FR has a lower ripple rating (not to mention that it will also get hotter because of its higher ESR), so it could last significantly less time.

You should use HM/HN/HZ. You mentioned you were looking at Digikey. They may or may not have what you need in an electrolytic cap. You might try doing a polymer re-cap.

Since this machine seems to be from 2006, it's robably worthwhile to have a look inside the PSU to check if the caps in there are OK. That way, you can order both the motherboard and PSU caps together and save on shipping.

[jesscat606]

Re: DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

Along with low ESR you want a capacitor with a high Endurance rating. The Panasonic FR series is now rated 5,000 hours at 105° C. Most are listed as 2,000 hours at 105° C.



Choose a cap that has a 105° C 'Lifetime @ Temp' or 'Load Life' rating of 5,000 hours or higher if you're looking for long service life.

BTW - I worked at the manufacturer of your motherboard (DFI-ITOX) for 7 years. We and many other MB manufacturers had a slew of MB returns due to bad caps. Flatscreen TV manufacturers were also affected.

Thanks! I was talking with the manufacturer of the unit (who used the dfi-itox board), and they were saying they had a lot of those units come in with this problem. wanted $2000 to replace the MB - apparently the working stock of these is really low!)

[jesscat606]

Re: DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

i use polys in those.
the ones i fix from harris hdradio exporters seem to have had a rough life.

Yeah, this one is a BE xpi10 HD Radio exporter - looks like it needed some TLC; I've already replaced a flaky PSU on it. I'm guessing the polys have higher heat tolerance? do you have any recommendations for poly replacements?

[jesscat606]

Re: DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

Nichicon HM series is a direct replacement, and HN and HZ series have lower ESR. I think any of those three series would work.

The 470uF caps in the second picture are KY series, which don't need to be replaced.

Are you sure they are all rated for 6.3V? The larger 1500uF caps might be rated for 16V.

Hey, thanks! I wondered about the 470s. All the Chemicons are 6.3V; the 16v ones are all OST.

The HM/HN/HZ don't have the failure issues the KZGs do?

[kc8adu]

Re: DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

i use polys in those.
the ones i fix from harris hdradio exporters seem to have had a rough life.

[trshaner]

Re: DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

Along with low ESR you want a capacitor with a high Endurance rating. The Panasonic FR series is now rated 5,000 hours at 105° C. Most are listed as 2,000 hours at 105° C.



Choose a cap that has a 105° C 'Lifetime @ Temp' or 'Load Life' rating of 5,000 hours or higher if you're looking for long service life.

BTW - I worked at the manufacturer of your motherboard (DFI-ITOX) for 7 years. We and many other MB manufacturers had a slew of MB returns due to bad caps. Flatscreen TV manufacturers were also affected.

[lti]

Re: DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

Nichicon HM series is a direct replacement, and HN and HZ series have lower ESR. I think any of those three series would work.

The 470uF caps in the second picture are KY series, which don't need to be replaced.

Are you sure they are all rated for 6.3V? The larger 1500uF caps might be rated for 16V.

[trshaner]

Re: DFI-ITOX G4S600-B with Chemicon KZGs - compatible caps?

The Panasonic FR series is a good choice for switching regulator applications such as on this motherboard.



Just make sure the diameter and lead spacing will fit and the same or higher working voltage.

There is a known issue with the Chemicon KZG capacitors. More info here:

https://www.badcaps.net/forum/showthread.php?t=30329

Ripple current and high-ESR is what caused these caps to fail.

[jesscat606]

Hey guys,

I've got a G4S600-B (this board) that has about 2 dozen UCC KZG caps on it. This is in a digital audio encoder used at a radio station, so it's been on/powered pretty much 24/7 for a number of years. recently it's been getting flaky, so I pulled it apart and noticed that 7 of the 16 1500uF caps on the board are bulged. Did some more research, (signed up for this board!) and find that the KZGs are pretty much despised here.

So I'm looking to recap the motherboard. The KZGs on it are all 6.3V, 105degrees:


1500uf 8x20mm marked 5(7) 7S- 10
1500uf 10x20mm marked 6(7) 6G - 4
1500uf ~10x12mm marked 6(k) 8E - 2
470uf ~5x11mm marked 5(k) 6c - 3
470uf ~5x11mm marked 5(k) 6V - 3

I'm assuming that I ought to replace the 470uf caps too?

(EDIT: looks like all the rest of the on-board caps are Nichicon HM(M) or OST RLG)

I'm looking through Digikey, most of what I'm seeing is Nichicon/Panasonics/Rubycon. I'm not very knowledgeable on ripple currents, esv, etc., so I'm hoping someone on here can help me out with some compatible replacements. Here's where I'm looking:


I've never seen a MB with this many popped caps!

Thanks guys,

-J