Fitting modern snap-in capacitors into older snap-in through-hole placement - Page 1
Forum section: electronics / repair

author: brandon.arnold
author_rank: Contributor
timestamp: May 29, 2023, 05:01:56 pm
content: Hi all. I'm looking to replace this large capacitor (labeled C627), in the two photos. Looking at the modern equivalent cap datasheets, there are a couple of snap-in mounting types. See the screenshot below, showing both. The old one I'm replacing is the "LI" type on the right.I don't actually think anyone makes this pin placement anymore! So I've already got the left-most "VS" types on the way.Has anyone done this retrofit before? I would love advice on how to stabilize it. The best I've got right now is to bend the pin and hope for the best. Maybe hot glue.

author: Audiorepair
author_rank: Frequent Contributor
timestamp: May 29, 2023, 07:17:39 pm
content: Hot melt glue does not always stick to everything.Silicone sealant pretty much sticks well to everything.

author: floobydust
author_rank: Super Contributor
timestamp: May 29, 2023, 07:33:00 pm
content: That is a high quality capacitor that typically outlasts many others. Are you sure you need to replace it?You can find snap-ins that match the diagonal pin spacing i.e. 10 or 15mm and fit that in, the cap ends up likely rotated a bit.

author: brandon.arnold
author_rank: Contributor
timestamp: May 29, 2023, 08:11:30 pm
content: Quote from: Audiorepair on May 29, 2023, 07:17:39 pmThanks for the tip! I will consider that. Does seem like something I would regret when I'm 60, replacing these again.Quote from: floobydust on May 29, 2023, 07:33:00 pmThe snap-ins I have ordered should fit, in that case!I am having wobbliness on my monitor at high brightness levels that leads me to suspect this large capacitor (see around 0:17 before the end of the video below. I've had the other caps replaced and the flyback on this monitor is impossible to find.

author: thm_w
author_rank: Super Contributor
timestamp: May 29, 2023, 11:27:05 pm
content: Do you have any tool or access to one that can test capacitance or ESR?Its very rare that a main high voltage capacitor fails, usually its the lower voltage output capacitors or bootstrap cap. But you've replaced those and it had no effect? I don't see them in the photo, all of the small caps in the photo look to be original.

author: brandon.arnold
author_rank: Contributor
timestamp: May 29, 2023, 11:36:41 pm
content: Quote from: thm_w on May 29, 2023, 11:27:05 pmInteresting. I actually had them re-capped by a Sony tech who is known in the retro tech scene. He does not replace all caps, but ones he deems most prone to failure. I would not be surprised if other caps need replacing.Edit: And yes, I do have a capacitor / ESR tester. But I assume it would not be able to test the kind of load these big boys require?

author: thm_w
author_rank: Super Contributor
timestamp: May 31, 2023, 10:08:41 pm
content: Quote from: brandon.arnold on May 29, 2023, 11:36:41 pmIf you have an ESR tester then you could test all the caps yourself.Look up on a chart or in a datasheet if the ESR is reasonable. For that 450V 330uF ESR spec is 0.75R (?), not sure of the exact number, but I would expect under 0.5 ohm if its still good.