LG Flatron Cap substitute

[socketa]

The monitor displayed black stalactites on about the top 10th of the screen.
So i pulled it apart and found a samxon GL with a domed and popped bung.
So will Recap it
All the rest are samxon GL, except for one tiny 0.47 50v samxon KM
There is two 33uf 50v caps of which i am not sure if i have adequate replacement:

(Only have Limited choices from supplier with free shipping for a limited time - but unfortunately none of the usual replacements are available for these caps.)
PW is the closest match for ripple and impedance
The original samxons have ripple rating of 295mA and Impedence rating of 0.30
The PW's have ripple rating of 300mA and impedance rating of 0.43 (under same conditions)

One of the capacitors is connected to the transformer, and the other is on the same 'rail' that one side of the faulty cap was on (the other side of the faulty cap is on a 'rail' which is connected to the 2 "12v" pins on the big connector socket)

So just making sure that it is cool to replace both of these caps with PW's - considering that one is on the input side, and the other is on the output side

On another thread Th3_uN1Qu3 said "but variations of +/-50% are perfectly acceptable for ESR as well." - but that was regarding a video card - so i'm not sure if thus rule of thumb would apply to both primary and secondary sides of a LCD monitor power supply

Also, for the little 0.47 50v samxon KM 7mA ripple with unknown impedance (next to the transformer), would it be OK to replace it with a rubycon YXJ rated at 17mA ripple (105deg/100khz) and 12ohm impedance?

[stj]

Re: LG Flatron Cap substitute

forget the PW's
ripple can be higher, but never lower - atleast not worth risking it
ESR can be lower but never go higher unless it's just 0.01ohms or so difference.

what's the supplier address?

[Pentium4]

Re: LG Flatron Cap substitute

You don't have to replace the 0.47uF. It's such a small value, and KM is much more reliable than the known bad Samxon series.

The original samxons have ripple rating of 295mA and Impedence rating of 0.30
The PW's have ripple rating of 300mA and impedance rating of 0.43 (under same conditions)

This will be an okay replacement. In this case I'd take ripple rating over ESR. In that place, ESR isn't insanely critical

[socketa]

Re: LG Flatron Cap substitute

what's the supplier address?

http://nz.element14.com

OK,
i was stuck on not changing the capacitance.
So how about Panasonic FR 47uf 405 ripple and 0.14 impedance
or XYJ 47uf 295 ripple and 0.3 impedance
These two sound like better replacements.

So is it better to look at increasing the capacitance a bit, while keeping the ripple and impedance within original specs?

[stj]

Re: LG Flatron Cap substitute

yes to all that.
and FR is my prefered cap in just about anything other than motherboards.

[socketa]

Re: LG Flatron Cap substitute

Thanks

Just noticed that the XYJ has exactly the same ripple and impedance, except that it is 47uf instead of 33uf, and 63v instead of 50v
The FR has 405 ripple instead of 295, 0.14 impedance instead of 0.30, and capacitance of 47uf instead of 33uf, while voltage remains the same.

Could the impedance on the FR be a bit too low, or are they both very much acceptable replacements?

[stj]

Re: LG Flatron Cap substitute

use either.
i suspect the FR is cheaper even though it's a better part.