Power Supply X2 Capacitor Advice

[rmcl5329]

Hello all
I am hoping this is in the right place.

I have an Optoma HD141x an x2 capacitor has gone. The damage has also made it difficult to to read the exact numbers.

I can see it must be a MKP62 684K 0.68uf X2. 275V

I have a few x2 capacitors rated 0.47uf with 275V. Would this be okay to use as a replacement?

I've purchased 2 now and on arrival they are larger in size so won't fit the power board. A direct replacement I can only seem to source from China :O

Does anyone have some advice for me? or point me in the right direction.

Here are some images too Image 1 Image 2

 

[mindless1]

That's bound to be part of the AC line filter. Unless you have other equipment that can't tolerate a little noise on the (same mains) AC circuit, you don't really need that capacitor, but being damaged I would go ahead and remove it.

Is the product not working and you saw damage so it was assumed this was the problem? Odds are a power line surge came in and damaged the cap and if the projector isn't working, that surge probably damaged something else too. That something else might be a bridge rectifier diode or most likely the switching transistor(s) on the heatsink in your pic. If the transistor(s) failed shorted you may also need a new fuse, or might need a new fuse either way.

Yes you can use your 0.47uF as a replacement, but you stated the problem is size yet did not mention what size you need? Looks like height is not an issue so what is the length, width, and pin spacing?

You can go to an electronics supplier like http://www.digikey.com and use their parametric search to find a cap with the right (or closest possible) specs and the same physical dimensions and lead spacing. Lead spacing is most important, other physical dimensions can be off a little bit based on the available space around it.

I see a listing on Aliexpress that meets your provided info and is listed as 31.5 X 12.5 X 21.5mm, lead spacing 27.5mm, but that is not what your picture suggests, so you'll have to measure it and input that somewhere like here:

https://www.digikey.com/products/en/capacitors/film-capacitors/62?k=&pkeyword=&sv=0&pv1292=27&pv1292=30&pv1292=31&pv1292=33&pv1292=35&pv1292=36&sf=1&FV=b0c00aa,b0c00ad,b0c00e7,b0c0132,b0c0206,b0c0208,b0c0222,ffe0003e,mu0.68µF|2049&quantity=&ColumnSort=0&page=1&stock=1&pageSize=25

Personally, I'd just use the 0.47uF you have as long as it's X2 (or better) rated, over 250VAC, and fits. Really if you're in a 110VAC region, it doesn't even need to be rated over 250VAC, just be X2 or better.

 

[rmcl5329]

That's bound to be part of the AC line filter. Unless you have other equipment that can't tolerate a little noise on the (same mains) AC circuit, you don't really need that capacitor, but being damaged I would go ahead and remove it.

Is the product not working and you saw damage so it was assumed this was the problem? Odds are a power line surge came in and damaged the cap and if the projector isn't working, that surge probably damaged something else too. That something else might be a bridge rectifier diode or most likely the switching transistor(s) on the heatsink in your pic. If the transistor(s) failed shorted you may also need a new fuse, or might need a new fuse either way.

Yes you can use your 0.47uF as a replacement, but you stated the problem is size yet did not mention what size you need? Looks like height is not an issue so what is the length, width, and pin spacing?

You can go to an electronics supplier like http://www.digikey.com and use their parametric search to find a cap with the right (or closest possible) specs and the same physical dimensions and lead spacing. Lead spacing is most important, other physical dimensions can be off a little bit based on the available space around it.

I see a listing on Aliexpress that meets your provided info and is listed as 31.5 X 12.5 X 21.5mm, lead spacing 27.5mm, but that is not what your picture suggests, so you'll have to measure it and input that somewhere like here:

https://www.digikey.com/products/en/capacitors/film-capacitors/62?k=&pkeyword=&sv=0&pv1292=27&pv1292=30&pv1292=31&pv1292=33&pv1292=35&pv1292=36&sf=1&FV=b0c00aa,b0c00ad,b0c00e7,b0c0132,b0c0206,b0c0208,b0c0222,ffe0003e,mu0.68µF|2049&quantity=&ColumnSort=0&page=1&stock=1&pageSize=25

Personally, I'd just use the 0.47uF you have as long as it's X2 (or better) rated, over 250VAC, and fits. Really if you're in a 110VAC region, it doesn't even need to be rated over 250VAC, just be X2 or better.

Thank you for your help and time taken in writing the reply.

I only noticed the issue due to the horrid electrical smouldering smell .

The projector appeared to work as far as I could tell as the confusing thing was the power and status LEDs were all still on when I found the issue. so it was worth a look for myself as didn't appear to be fully dead.This means you are correct when you say that's apart of the AC filter and not necessarily needed.

I ended up purchasing a few - as they were pennies on eBay but the spacing is way out and didn't really want to purchase from Aliexpress if I could source something locally. I have a few which appear to be the correct spacing I was just worried that the rating was slightly different but as you mention I can go ahead and use the 0.47uf instead & shouldn't be an issue.

I'll purchase a better match using the site you sent over or at least it will give me part numbers to help source one.

Tomorrow I will take out the damaged cap and replace with the one I have and let you know the result. Do you think purchasing a surge protector mains adaptor would also help with the issue further down the road?

I appreciate the help.

 

[mindless1]

If you don't have other electronics that have suffered surge damage in recent years and/or no known electrical changes to cause it (anything on a near circuit with a large motor might kick back a surge when the motor shuts off), it might just be an isolated incident.

On the other hand it is easy for me to spend your money and tell you that you're safer from surges to have a surge suppressor than to not have one.

I would seriously consider one for anything valuable.

Something to consider about unusual sizes and values of Chinese capacitors is they may be low quality and less reliable. Personally I wouldn't put any of them on the mains AC line, in a line filter unless I was familiar with and trusted the brand.

They're usually a lot cheaper for a reason and I don't like to do a repair with a lower quality part than the one that already failed, usually I try to do the opposite.

 

[rmcl5329]

If you don't have other electronics that have suffered surge damage in recent years and/or no known electrical changes to cause it (anything on a near circuit with a large motor might kick back a surge when the motor shuts off), it might just be an isolated incident.

On the other hand it is easy for me to spend your money and tell you that you're safer from surges to have a surge suppressor than to not have one.

I would seriously consider one for anything valuable.

Something to consider about unusual sizes and values of Chinese capacitors is they may be low quality and less reliable. Personally I wouldn't put any of them on the mains AC line, in a line filter unless I was familiar with and trusted the brand.

They're usually a lot cheaper for a reason and I don't like to do a repair with a lower quality part than the one that already failed, usually I try to do the opposite.

I replaced with this one I had about . Projector appears to be working fine now with no issues. I found a Kemet match which I will be receiving in a week or so.
Purchased a surge protecting plug with mild line conditioning properties too.
Thanks for all your help and advice