someone dares to use lower ripple capacitors then the original, or lower esr for that matter?? I bet it would make nice fireworks a few months after use 
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Guns don't solve problems. I'll take 12
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Re: What happens if...
Lower ripple: can lead to explosion, leaking, increased ESR, generally failure.
Lower ESR: that's a good thing. It will do just fine. -
Re: What happens if...
In a PSU, changing the ESR (either way) would probably not result in a fireworks display - it would just not be as well tuned to the PI filtering coils as the originals and so the ripple may be somewhat worse.
If you went lower ripple, the cap would just overheat, wear out anf fail quickly, and the ripple would skyrocket. Again, though, it probably wouldn't make a PSU go up in smoke.I love putting bad caps and flat batteries in fire and watching them explode!!
No wonder it doesn't work! You installed the jumper wires backwards
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Re: What happens if...
Read the last part here.
https://www.badcaps.net/forum/showpo...9&postcount=27
Excessive Ripple [which is AC] thins the oxide layer on the foil.
The oxide layer is the actual dielectric.
The thinner layer allows more DC Leakage current which further heats the cap.
When the DC Leakage current gets too high 'in spots' the cap the will begin to develop localized shorts that are beyond the electrolyte's capability to 'self heal' through the electrolytic chemical reaction.
In other words 'spots' of foil with permanent damage.
[That could happen fast or slow depending on how bad the conditions are.]
Additionally as the shorts develop the uF typically goes down because the surface area of the foil is being reduced.
Long term use with excessive Ripple applied eventually creates enough localized shorts that the overall condition of the cap is shorted or partially shorted.
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At some point the excessive heat may [depends on the electrolyte] break down the electrolyte causing gas formation inside the cap [which is what bloating is] but it might not happen until very late in the failure.
If the failure occurs slowly you can have a very long period of erratic/unstable behavior from the degrading caps before they -visually- bloat.
They may never bloat at all if the failure is slow and the gasses manage to leak past the bung relieving the pressure.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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When I tried to repair LG 29 inch CRT TV, I found that the ESR value of samyoung SMS capacitor(160v 2.2uf), which is very close to D1879 transistor, is 6 ohm.
Judging from above ESR Meter Table,I think It is necessary to replace this sms capacitor.So I visited local electronics shop,and I purchased 160v 2.2uf rubycon YK capacitor.
But when I browse through rubycon YK datasheet,I found that there is no ripple current rating for 160v 2.2uf specification. But On the contrary, I found 39 mA ripple current rating for 160v 2.2uf SMS capacitor.
Rubycon YK DataSheet (b... -
I have here a HP pavilion hp 15-cs2975nd with a 1.095v power supply that is driven by a FDMF3035. I do see about 80mV of ripple on my scope. I searched through the datasheet to find possible values of the ripple but I don't understand the datasheet well enough.
So I have two questions:
1) what is the typical ripple voltages of gpu/cpu on a laptop or pc mobo?
2) what would be the max ripple of a FDMF3035 that drives an output of 1.095V?
Would be nice to have a rule of thumb of say a percentage of the supply voltage to be an acceptable ripple voltage....12-09-2022, 06:51 AM -
Hi all
I need to replace a 680uF 35V SamYoung NXB cap which has got a ripple of 1820. Whilst passing my local little electronics shop I picked up what they had in stock which was a 680uF 35V Panasonic FC with a ripple of 1655.
As the ripple rating is only 9% below what the original was I am wondering whether to risk it and fit it.
The catalogues specify a capacitance tolerance of +/-20% but state nothing about the ripple. If there is a similar tolerance for ripple then I might be worrying about nothing. Does anybody know?
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Hi
I have a Lenovo 530 14ikb i5 8th gen motherboard and it fails to start Windows: it normally dies after I try to load Windows. Getting into bios screen works fine.
Made some measurements and I suspect that there is to much ripple on the 2 Vcore coils.
What is normally the maximum ripple allowed on say any of the power supplies? A few %??
The ripple is on both Vcore as outlined in red in attached photos.
Could be a bad driver?
Cheers... -
Hi fellow troubleshooters. This is my first post on badcaps. I've recently setup an electronics workbench. i'm also building a studio with old equipment bought faulty at low cost.
I've been into electronics since the mid 80's and particularly in the last few years though only getting hands on with repairs now. My knowledge gaps are significant so I'll be posting here to seek guidance advice and general practical applied learning.
On my bench today is an old ca. 1993-95 Akai hardware sampler. This runs on both a linear and Smps supply. Both are getting on in age and ripple...
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