Hello everyone,
I was doing some further research into the premature failures of Rubycon's MCZ series and Chemicon's KZG series.
After working with a handful of the same motherboards which used varying caps from both brands and different series, there was always an 80% chance that these KZG or MCZ capacitors failed prematurely-- whereas other quality low-ESR series didn't.
I also had a handful of other computers which were unrelated to my original five that contained blown MCZ and KZG.
For example. if we had a bunch of 2200uF MCZ or KZGs on one board, and then 2200uF MBZ/ZLH on another, the MCZ/KZG were *always* catastrophically blown up. Generally the KZG will just open up and dry up, whereas the MCZ will spill their guts.
Now, supposedly these caps (MCZ/KZG) offer low ESR-- but if they fail prematurely; this potentially means they aren't even *deliverying* that low-ESR. Even upon release from the factory due to their inherent instability. Similar to how chinese G-Luxons or TEAPOs are *not* delivering any of those ratings as stated on their sleeves.
Having discovered Rubycon's rather interesting RX30 series, I decided to replace all 1500uF MCZ/KZG based capacitors with RX30 (which also offer more voltage tolerance).
Here you can see I replaced the MCZs with RX30. Some of the rather small desoldered MCZ caps are near the top of the board for comparison. I think one problem these low-ESR capacitors have is that... they are just too small.
After replacing MCZ & KZG with RX30s, the computers booted up fine and were tested for extended periods of time.
In further studies, I discovered RX30 has rather impressive abilities to suppress noise in audio circuits. After recapping the audio capacitors, my line in mixer, and various sound cards-- the white noise and any line hum is rectified.
So that's another use for them. Really quite flexible.
Anywho, I hope that may be useful to anyone who is looking to replace the MCZ or KZG that have popped/making their system unreliable. I'd also recommend Rubycon ZLH or Panasonic FL in place of extra sensitive ESR applications.
I was doing some further research into the premature failures of Rubycon's MCZ series and Chemicon's KZG series.
After working with a handful of the same motherboards which used varying caps from both brands and different series, there was always an 80% chance that these KZG or MCZ capacitors failed prematurely-- whereas other quality low-ESR series didn't.
I also had a handful of other computers which were unrelated to my original five that contained blown MCZ and KZG.
For example. if we had a bunch of 2200uF MCZ or KZGs on one board, and then 2200uF MBZ/ZLH on another, the MCZ/KZG were *always* catastrophically blown up. Generally the KZG will just open up and dry up, whereas the MCZ will spill their guts.
Now, supposedly these caps (MCZ/KZG) offer low ESR-- but if they fail prematurely; this potentially means they aren't even *deliverying* that low-ESR. Even upon release from the factory due to their inherent instability. Similar to how chinese G-Luxons or TEAPOs are *not* delivering any of those ratings as stated on their sleeves.
Having discovered Rubycon's rather interesting RX30 series, I decided to replace all 1500uF MCZ/KZG based capacitors with RX30 (which also offer more voltage tolerance).
Here you can see I replaced the MCZs with RX30. Some of the rather small desoldered MCZ caps are near the top of the board for comparison. I think one problem these low-ESR capacitors have is that... they are just too small.
After replacing MCZ & KZG with RX30s, the computers booted up fine and were tested for extended periods of time.
In further studies, I discovered RX30 has rather impressive abilities to suppress noise in audio circuits. After recapping the audio capacitors, my line in mixer, and various sound cards-- the white noise and any line hum is rectified.
So that's another use for them. Really quite flexible.
Anywho, I hope that may be useful to anyone who is looking to replace the MCZ or KZG that have popped/making their system unreliable. I'd also recommend Rubycon ZLH or Panasonic FL in place of extra sensitive ESR applications.
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