I have what I think is a bad power supply from a tivo dvr. I noticed that 2 capacitors are bulging at the top. one is a 2200uf 25v and the other is 2200uf 16v. Can I try and replace them w/with both 2200uf 25v or does the 2200uf 16v need to be replaced with an identical cap?
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electronics question
- Thread starter echo4747
- Start date
drinkmorejava
Diamond Member
Higher voltage rating is fine. That's the max voltage to avoid dielectric breakdown. It's kind of like how loud your speakers can go, but if you never crank them to 11, then it doesn't matter.
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that is what i thought.. thanks for confirming
Yes. Replacing with a higher voltage rating is fine.
However, some power supply capacitors do need other certain specifications to work correctly. If there are any brand or model markings on the original capacitors it would helpful to know those so that proper replacements can be recommended, as a generic replacement may not work correctly or last long.
However, some power supply capacitors do need other certain specifications to work correctly. If there are any brand or model markings on the original capacitors it would helpful to know those so that proper replacements can be recommended, as a generic replacement may not work correctly or last long.
drinkmorejava
Diamond Member
You can find the basic data here. capxon-europe.com/downloads/catalogue2012.pdf on page 124
KF is the capacitor series. In this case it's a low impedance cap.
105 deg C means this is a high temperature cap. Pretty typical for power supplies.
Vent mean vented. Typically there are a few lines stamped on top. These lines split open and vent gases if the cap fails instead of allowing it to explode. Many don't say vented because it's pretty obvious when you know what to look for.
KF is the capacitor series. In this case it's a low impedance cap.
105 deg C means this is a high temperature cap. Pretty typical for power supplies.
Vent mean vented. Typically there are a few lines stamped on top. These lines split open and vent gases if the cap fails instead of allowing it to explode. Many don't say vented because it's pretty obvious when you know what to look for.
Don't get another CapXon capacitor as replacement, go to digikey.com and get a decent replacement. CapXon capacitors are crap, they were also used on the infamous Samsung monitors with capacitor issue. I had to replace them on both of my wife's Samsung monitors.
the 25v cap is a bit bigger in physical size..but there there seems to be plenty of space on the printed circuit board to accommodate a slightly larger cap
these are what I bought:
http://www.ebay.com/itm/280809207071?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
is NICHICON a decent brand?
NAC4EV
Golden Member
What is the replacement cost of that power supply???
Are you confident that there aren't other problems with the power supply????
If the new capacitor has larger lead spacing than the original, check the underside of the board to see if the copper traces will accommodate that spacing.
You may have to drill a new hole.
Are you confident that there aren't other problems with the power supply????
If the new capacitor has larger lead spacing than the original, check the underside of the board to see if the copper traces will accommodate that spacing.
You may have to drill a new hole.
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I am not sure if there are other problems with the power supply. From what some people are saying from a tivo forum is that its kinda common for these power supplies to fail and others have repaired them by replacing the bad caps. I noticed 2 caps with bulging tops on the power supply board(these caps were also warm to the touch.) The cost for a working used unit is around $89 on ebay. I also noticed there seems to be some type of what appears to be something that resembles dried white caulking between the capacitors that binds them together. What is it? Does it serve any purpose?
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Red Squirrel
No Lifer
NAC4EV
Golden Member
SOFTengCOMPelec
Platinum Member
Many of the capacitors for sale on ebay, are considered fake/bad ones. Often coming from China, or from China via another country.
A quick glance at the supplied photo, does NOT give me much confidence in them. They look rather sloppy (poor construction, e.g. look carefully at the leads) and could be fake.
But they could be genuine.
Also a quick glance at their feedback, also has some reports of bad/fake/etc capacitors and other components.
Power supplies are often quite demanding of the capacitors, so could do with decent real (non-fake) ones.
Decent suppliers like digi-key/Mouser etc, can almost always (or always), be relied upon to supply the genuine article.
All I can do now is hope for the best. I would have never thought anyone would bother to counterfeit something as cheap as a little capacitor. If they are bad or go bad a short time after. i will buy some from digikey. At least I only spent a little over 6 bux for 10pcs
SOFTengCOMPelec
Platinum Member
If you have got a capacitance test function on your multimeter, you can check the value is about right, at least.
Example of fake/bad capacitor reports:
http://www.ebay.co.uk/gds/Fake-RubyCon-Electrolytic-Capacitors-on-Ebay-/10000000009070950/g.html
The following link, helps you identify fake/bad ones:
https://68kmla.org/forums/index.php?/topic/23820-how-to-spot-a-counterfeit-capacitor/
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Red Squirrel
No Lifer
^^ oh wow it's ridiculous what these fraudsters will do these days. That seems like so much more trouble than it's worth lol.
But yeah most of the time the stuff you get on Ebay and Amazon is going to be fake Chinese Wun Hung Lo brand. You might still be ok though, it's really hit or miss what you get. Sometimes you do get a genuine item.
But yeah most of the time the stuff you get on Ebay and Amazon is going to be fake Chinese Wun Hung Lo brand. You might still be ok though, it's really hit or miss what you get. Sometimes you do get a genuine item.