Reply 20 of 40, by kenrouholo
The type of cap you circled is a ceramic cap and they aren't really good types of caps for many reasons, but they also don't tend to go bad.
Your main caps are the yellow "drop" shaped things. Tantalum caps. They're similar to electrolytic caps in performance and I don't believe the construction is very different, either, though I don't know as much about the materials science side of them.
You can't test a capacitor with a regular multimeter. You must have an ESR meter. I mean you can use a multimeter to sometimes determine a bad cap, but only very rarely will a cap be so bad that you'll find it that way. It's pretty much a waste of time. You can try it with the tantalum caps if you want but don't expect much in the way of results from this method.
Edit: Keep meaning to reply and say 2 things, and forgetting to say the second thing...
What did the ceramic cap you circled act like?
It may be in parallel with other devices that throw your results off, which is fairly common "in circuit." Or is it appearing open? Maybe it has some charge on it if so. When your meter says infinite/open, what it means is "extremely high resistance" which a charged cap could potentially present.
Yes, I always ramble this much.