Ignorant question of the day. Can I use a .022uf 800V cap in place of .018uf 630V?

[johnboy1313]

I found a Samsung LN32C450E1D today. It had the same symptoms as the set in this post.

https://www.badcaps.net/forum/showth...ht=Ln32c450%2A

In that post, budm helped the OP find a capacitor to work in place of the original cap, a .018uf 630 "high pulse" cap.

I found a 223H (.022uf) 800V cap on another board that I had in my cabinet. The set turns on now. Can I just use this cap instead of ordering the one bud suggested from Digi-Key?

[chrismurphy]

Re: Ignorant question of the day. Can I use a .022uf 800V cap in place of .018uf 630V

Should be OK ,set works great

[budm]

Re: Ignorant question of the day. Can I use a .022uf 800V cap in place of .018uf 630V

If the feedback signal level is generate based on the Xc of the cap then it may not work, it depends on the circuit design. That is >20% higher than the original.
That cap probably has one end connected to circuit ground and another end is connected to the winding of the transformer for half-bridge drive setup and the feedback is taken from the top side of the cap. Are you working on the same board bn44-00338B? If it is then you are OK, the cap is on the high side of the circuit.

[johnboy1313]

Re: Ignorant question of the day. Can I use a .022uf 800V cap in place of .018uf 630V

If the feedback signal level is generate based on the Xc of the cap then it may not work, it depends on the circuit design. That is >20% higher than the original.
That cap probably has one end connected to circuit ground and another end is connected to the winding of the transformer for half-bridge drive setup and the feedback is taken from the top side of the cap.

That pretty much went over my head, but I think I caught the point. I'll order the replacement cap.

Thanks Bud.

[budm]

Re: Ignorant question of the day. Can I use a .022uf 800V cap in place of .018uf 630V

That pretty much went over my head, but I think I caught the point. I'll order the replacement cap.

Thanks Bud.

I updated my reply.

[johnboy1313]

Re: Ignorant question of the day. Can I use a .022uf 800V cap in place of .018uf 630V

Are you working on the same board bn44-00338B? If it is then you are OK, the cap is on the high side of the circuit.

Yes, same board. That is cool. Thanks again, Bud.