replacment LG TV Cap

[dablac01r]

The main capacitor on the power board burst. It is a Samyoung 550sv 120uf 460v I can not find this part anywhere can I use a 120uf 450v instead. If not can you help me locate a superior capacitor.

[Zero999]

Generally it's not a good idea to go for a lower voltage part. Try to find one rated to a higher voltage, if you can't get one rated for 460V.

Another headache is matching the PCB footprint.

You probably could get away with 450V but it won't last as long as one rated to 460V. Go for 105^oC temperature rating if you can and as low ESR as possible.

I've just quickly searched RS Components and they have lots of 120uF and 150uF (you can probably use a slightly higher value) 500V capacitors.
http://uk.rs-online.com/web/c/passive-components/capacitors/aluminium-capacitors/?applied-dimensions=4292049087,4292049457,4292047454,4292049502,4294455094,4294465685,4293569694

[BMack]

It's not good practice to go lower voltage but it will work.

[IanMacdonald]

If it's a simple rectifier then the cap will have about 1.5 times the RMS mains voltage on it, so for 240v anything over 400v rating will work. The exception is if it's a power-factor corrected PSU, when it might have a step-up Buck converter giving up to 450v at the reservoir cap. Those are not so common in TV sets though.

Some 120v PSUs have a voltage doubler,  but this identifiable by having two similar reservoir caps.

[wraper]

450V vs 460V is only 2% difference, so does not matter at all. Actual working voltage should be around 380-400V.

[wraper]

The exception is if it's a power-factor corrected PSU, when it might have a step-up Buck converter giving up to 450v at the reservoir cap. Those are not so common in TV sets though.

They are common, actually I'm pretty sure it's one of them.

You probably could get away with 450V but it won't last as long as one rated to 460V.

Such voltage rating difference by itself would make nearly zero difference. Manufacturer and series is what matters.

I've just quickly searched RS Components and they have lots of 120uF and 150uF (you can probably use a slightly higher value) 500V capacitors.
http://uk.rs-online.com/web/c/passive-components/capacitors/aluminium-capacitors/?applied-dimensions=4292049087,4292049457,4292047454,4292049502,4294455094,4294465685,4293569694

And none of those would fit there. Other than capacitors in RS catalog are snap in or screw terminal type, unlike this cap with leads on this PCB, it also seems to be of very low diameter and high length type.