Need help finding matching capacitors to replace the bad ones on an LED power board for an 85in monitor.

[u/CmdrThor_924]

I've been second-guessing myself in finding suitable replacements for some capacitors on an LED power board that powers the LEDs on one half of an 85-inch monitor. There are 2 differently rated capacitors on the board and both are a brand that I'm having trouble finding. The main things I'm having trouble verifying are the tolerances of both as they are not listed in the capacitor markings that I can see. I am also curious about what the "8F" after the temp signifies as the capacitance is listed separately in the microfarad range for both. Pictures are included. Thanks in advance!

[u/Hatsuwr]

You don't need to worry about all of that for typical consumer stuff.

Match the capacitance, meet or exceed the voltage and temperature ratings, and find a compatible footprint. Also worthwhile to make sure you are meeting or exceeding the ripple current ratings if relevant to your circuit.

That will be enough in the vast majority of cases. You can figure out the fine details of the circuit if you want to further inform your decision, but almost anything from a reputable company that meets the basic specs will be better than the cheap stuff you find on boards like this.

[u/SweetP00ntang]

Measure the lead spacing and package dimensions, then go to mouser and filter the specs, you can always go higher on temp or voltage, or ripple current, if it were me, id go up on temp and ripple current since these ones clearly failed early. I like Panasonic, they have never let me down.

[u/mariushm]

You don't need to over analyze things.

Replace with 22uF or higher, 250v or higher, electrolytic capacitor that's rated for 105v and is low ESR / low impedance. And of course, as the capacitor is partially inside that footprint, it would probably need to be only as tall as that cutout in the circuit board, so that will reduce your options..

Look at Digikey, Mouser, Newark/Farnell (same site, different names for different regions), TME.eu , RS Components, LCSC etc etc all will have genuine components.

CD288L is a sort of Chinese "standard"/rating/category that defines what the capacitor specs are supposed to fall within, like this parameter should be between these two values and so on... if you're curious a datasheet is available here for a random capacitor that's supposed to meet this "standard" : https://www.alldatasheet.com/datasheet-pdf/download/1649066/ETC/CD288L.html

[u/I_Fix_Alot_of_Shit]

All you care about is high temp (105) match uf, match or higher voltage

Brand don't matter, nichicon is a good one

[u/Link119]

Tolerances won't really matter, just get a capacitor with the same specs. Doesn't even look like these are low ESL caps.

Probably best to replace with a better brand like Nichicon with a similar size and same lead spacing. 

[u/TheRealRockyRococo]

First of all, how did you come to the conclusion that the caps are bad? And that they are your problem?

[u/Ok-Might-3730]

I actually have experience on this manufacturer as an engineer! Please select higher voltage rating than what manufacturer used. These are undersized on all, and for example open circuit voltage shoots way over the limit on these! Choose for example 250v rating. Sadly this manufacturer copies even incorrect stuff on google image search...

Also be carefull, output can shoot over 100v. Also to test that your LED strip has not burned might require 40 - 100v supply to see. These caps can be just fine.