Abit AN7 Badcaps

[djrock]

Hi, I have a Abit AN7 with badcaps. I am not sure if I should do a full recap or just recap the bulging and the same make/series as the bulging ones or as well recap the 1000uf and above?

One beside IDE2 port (6.3v 3300uF KZG) and another beside floppy port (6.3v 2200uF KZG).


One Bulging beside cpu. (6.3v 3300uF KZG)


Not sure if its a badcap or its been knocked?


Its a Rubycon YXG.


Caps on Motherboard
Volts uF
6.3 3300 KZG
6.3 2200 KZG
6.3 1000 TMZ
6.3 1800 MBZ RUBY
25 100 YXG RUBY
16 1200 ZL RUBY


Thankyou

djrock

[c_hegge]

Re: Abit AN7 Badcaps

Replace all but the rubycons. Chemi-con KZG, KZJ and TM_ series are unreliable and will often fail with no visible signs.

[yyonline]

Re: Abit AN7 Badcaps

To add to that, replace them with something other than KZG, which will just fail again. I'm not sure what all is available in the UK, perhaps someone else can chime in with that info.

As for the crooked Rubycon, it was either knocked or soldered in crooked from the factory. If it was knocked, replace it. If it was soldered in crooked, there's no cause for concern.

[djrock]

Re: Abit AN7 Badcaps

Replace all but the rubycons. Chemi-con KZG, KZJ and TM_ series are unreliable and will often fail with no visible signs.

I was thinking about doing that after reading about them on here, which didn't give me any faith in them. But thought I would check first.

To add to that, replace them with something other than KZG, which will just fail again. I'm not sure what all is available in the UK, perhaps someone else can chime in with that info.

As for the crooked Rubycon, it was either knocked or soldered in crooked from the factory. If it was knocked, replace it. If it was soldered in crooked, there's no cause for concern.

Unless I was really stuck I wouldn't be wasting money buying more KZG. Where the rubycon is, its in a place where i think it would be hard to knock. One way it could of been knock is changing a jumper for I think keeping the power to usb ports when system is off. I could change it to be safe.

The caps I can get is Rubycon ZL and Panasonic FC/FM.

Thankyou

[bigbeark]

Re: Abit AN7 Badcaps

If you have to choose between Ruby ZL, Panny FC and Panny FM the right choice is Panny FM. That said Nichicon HM or HN will be better choice overall.

[PCBONEZ]

Re: Abit AN7 Badcaps

The caps I can get is Rubycon ZL and Panasonic FC/FM.

All of those are lower grade than KZG. [And KZG is lower grade than KZJ.]
FM are almost rated as good as KZG but not quite.
.
KZG = MBZ, HM, WG, FJ, GD, and NRSK

These are one grade better than KZG:
KZJ, HN, MCZ, GC
.

There is a member here named Big Pope.
He sells Samxon out of Hong Kong. [Buys direct.]
Send him a PM.
https://www.badcaps.net/forum/member.php?u=682
.

TMZ are a special order cap so no data sheets.
Direct measurement puts them between KZG and KZJ.
For what they get used for the same replacements as stated for KZG should be fine.
.

[djrock]

Re: Abit AN7 Badcaps

All of those are lower grade than KZG. [And KZG is lower grade than KZJ.]
FM are almost rated as good as KZG but not quite.
.
KZG = MBZ, HM, WG, FJ, GD, and NRSK

These are one grade better than KZG:
KZJ, HN, MCZ, GC
.

There is a member here named Big Pope.
He sells Samxon out of Hong Kong. [Buys direct.]
Send him a PM.
https://www.badcaps.net/forum/member.php?u=682
.

TMZ are a special order cap so no data sheets.
Direct measurement puts them between KZG and KZJ.
For what they get used for the same replacements as stated for KZG should be fine.
.

OK, Would Nichicon PW be any good as a replacement of KZG? I want to try and avoid buying from outside of the UK. Since I would need to check what duty and or vat I would possibly have to pay.

Thankyou

[yyonline]

Re: Abit AN7 Badcaps

OK, Would Nichicon PW be any good as a replacement of KZG? I want to try and avoid buying from outside of the UK. Since I would need to check what duty and or vat I would possibly have to pay.

Thankyou

No, PW are equivalent to Panasonic FC and aren't good enough spec-wise. I haven't been able to find anything comparable to KZG specs available in the UK. Then again, I haven't looked very hard, just a few brief glances to help out forum members.

Panasonic FM is the closest you've listed so far.

[ratdude747]

Re: Abit AN7 Badcaps

I will toss in this:

whatever you do, do not get your caps from ebay!

there is maybe one supposedly good seller... the rest are fakes...

I second the suggestion to see big pope.

[PCBONEZ]

Re: Abit AN7 Badcaps

PW are -FAR- lesser grade than KZG.

When comparing cap grades go by the can size.
For example look at ripple & ESR for an 8x20mm KZG and then for an 8x20mm PW.
Look at the same for 10x20mm or any other can size present in both series.
-
WITHIN A SERIES all with the same can size will have the same ripple and ESR.
ESR and ripple are NOT related to uF and/or volts,,, just to the can size.


I attached KZG data sheet because they are no longer in production and it may be hard to find now.
.

[djrock]

Re: Abit AN7 Badcaps

Hi all,

No, PW are equivalent to Panasonic FC and aren't good enough spec-wise. I haven't been able to find anything comparable to KZG specs available in the UK. Then again, I haven't looked very hard, just a few brief glances to help out forum members.

Panasonic FM is the closest you've listed so far.

The places I have been looking at are rs components and Farnell. I now see why the panny FM (0.018 2,470) and KZG (0.012 2,800) are quite close.

I will toss in this:

whatever you do, do not get your caps from ebay!

there is maybe one supposedly good seller... the rest are fakes...

I second the suggestion to see big pope.

I wouldn't buy them off ebay after reading on here about fake caps.

PW are -FAR- lesser grade than KZG.

When comparing cap grades go by the can size.
For example look at ripple & ESR for an 8x20mm KZG and then for an 8x20mm PW.
Look at the same for 10x20mm or any other can size present in both series.
-
WITHIN A SERIES all with the same can size will have the same ripple and ESR.
ESR and ripple are NOT related to uF and/or volts,,, just to the can size.


I attached KZG data sheet because they are no longer in production and it may be hard to find now.
.

I think I get it now, I have been looking at the datasheets but could not find esr which I take it that is impedance?

Looks like it could be badcaps or Big Pope for the caps.

Thankyou

[PCBONEZ]

Re: Abit AN7 Badcaps

At 100kHz, ESR and Impedance are effectively equal.
-
100kHz is the normal frequency used in data sheets for low ESR caps.
Once in a while you will see a data sheet that uses another frequency but there should be a conversion factor somewhere in the data sheet that will tell you what it is at 100kHz.
.

[momaka]

Re: Abit AN7 Badcaps

You can use the Panasonic FM's if you go up a notch or two with their voltage rating. Many cheap motherboard and PSU manufacturers do that to get better ripple current and ESR ratings for a given capacitance. This is because, like PCBONEZ said, for a given series, the ESR and ripple depend on the can size. If you have a 1000uF Panasonic FM capacitor, for example, the 16v version will have much better ESR and ripple specs than the 6.3v one.
So that's also one possible way to do it, if you run out of options.

[PCBONEZ]

Re: Abit AN7 Badcaps

You can use the Panasonic FM's if you go up a notch or two with their voltage rating. Many cheap motherboard and PSU manufacturers do that to get better ripple current and ESR ratings for a given capacitance. This is because, like PCBONEZ said, for a given series, the ESR and ripple depend on the can size. If you have a 1000uF Panasonic FM capacitor, for example, the 16v version will have much better ESR and ripple specs than the 6.3v one.
So that's also one possible way to do it, if you run out of options.

That's not exactly how it works. [But close.]
- Higher voltage caps tend to have a larger can size.
It's the larger can that gives them better specs, not the voltage.
.
What the cheap-out mobo builders were doing was using cheaper grade & cheaper $$ caps with big-a** cans to get ESR low enough.
The nice thing about that is there's a lot of room to mount whatever size cap you want.
Copying that trick doesn't always work out so well trying to replace 'normal size' caps with lower grade 'good caps' that have large cans. The mounting area can easily be too small.
.
If you can find the same uF in a bigger can with the same or better [than original] ESR and Ripple you might get FM to work out but the FM may have problems fitting in the same space as the old cap.
Also, using caps with a lower Ripple rating than the original risks overheating the cap internals. They may not last long at all.
- It's REALLY just easier [and safer] to be patient get the correct caps.
.

[momaka]

Re: Abit AN7 Badcaps

That's not exactly how it works. [But close.]
- Higher voltage caps tend to have a larger can size.
It's the larger can that gives them better specs, not the voltage.

Yes, that's what I was trying to get at. Thanks for clarifying.