Question about changing capacitor voltage on the VP6

[Slugjet]

On the VP6 between the AGP and first PCI slot there is a Jackcon 8x15mm, 16V, 1000uF capacitor. Is it safe to substitute a 10V capacitor there?

[Tom41]

Re: Question about changing capacitor voltage on the VP6

As a general rule, you should never substitute a lower-voltage cap for what was originally there. The original was 16V for a reason, and if you put a 10V there it could be subjected to more than 10V, and therefore bulge/vent. I recently tried applying 20v to a 10v cap, and the pic in my avatar shows the result.

Replacing with a higher voltage cap is usually OK within certain tolerances.

[starfury1]

Re: Question about changing capacitor voltage on the VP6

'Ill second that......Tom41

Having said that you will notice a few posts around the forum were people have been told they can use a lower voltage cap
This only when the voltage is known to be lower 5 Volt or 3V3

EG sometimes you will see a post were a 10 volt is use and they are advised to use a 6V3 cap

The cardinal rule is that the Voltage rating of the cap must be higher then the voltage rail it sits across

If its a 16 Volt cap it is probably across a 12 Volt line so a 10 Volt cap would be a no no but if its 5 volt supply line then a 10 volt would be fine...get the idea

You can a lot of the time go a value or 2 up with capacitance, but it does depend on the use of the cap too

What you tend to find is the size of caps becomes a problem with going up in voltage and capacitance.
(size can be a problem anyway with Mother boards)

Ideally with low ESR caps you want them to sit flush to the pcb

I am not familiar with the PCB but I am sure there are a few of posts on it if you search these forums


I know you are really looking for a ye or nay on this, I have a feeling there maybe a post about this somewhere here...anyway

someone here will most probably know the cap you are talking, about its function and if you can use a 10V thought

HTH cheers

[starfury1]

Re: Question about changing capacitor voltage on the VP6

there are few posts and I did a quick look through some but did not find a conclusive ya or nay... just a doubt by willawake so you may get away with 10V
Remember this is NOT a conclusive yes

https://www.badcaps.net/forum/showthread.php?t=2489

hopefully someone can confirm this for you

[Slugjet]

Re: Question about changing capacitor voltage on the VP6

Thanks, Tom41 and starfury1, I appreciate your efforts to keep me from doing anything calamitously irresponsible.

Anyway, I did what I shoulda done in the first place. Got off my enormous fat behind and removed the VP6 from its case so I could measure the voltage at the point in question.

From the condition of PSU on and power switch off through POST to OS it never exceeds 3.3V. So I think a 10V capacitor will give me a considerable margin of safety.

[starfury1]

Re: Question about changing capacitor voltage on the VP6

no worries...yeah that was going to be my other suggestion that I forgot to put in...measure it...

bit funny thought using 16 v for 3V3 but Suppose its really a matter of buying power....

[Rainbow]

Re: Question about changing capacitor voltage on the VP6

I use 16V caps everywhere too - bought a bag of 250 of them so it's cheaper and no need to have various types.

[Big Pope]

Re: Question about changing capacitor voltage on the VP6

I use 16V caps everywhere too - bought a bag of 250 of them so it's cheaper and no need to have various types.

Woo.. you use 16v caps evwerywhere?

I have tested when used with all 16v caps on a mothbaord. The result is that the boot screen will appear slower than before.

I guess the reason that higher voltage caps need to more time for charging the caps, right?

[999999999]

Re: Question about changing capacitor voltage on the VP6

No a higher voltage cap (of same size) will have lower capacitance and charge faster. YOur result with a slower boot screen is really strange, not what I've seen and I also use a lot of 16V caps whenever reasonably possible.