I have a lithium battery charger that will no longer charger my batteries. I have another that works fine, this one flashes for a couple of seconds, then both LED's light up which means there's a fault. The only thing I can see as maybe an issue is a slightly swollen cap in the top right, but I'm not that good at these things.
replace all the caps that are the same brand as the swollen one.
It's that cap. Electrolytic caps are the weak part. They won't always burst, just swell slightly and not even as much as that one. I pulled one with the same rating and tolerance off a donor board once to get a board working in the past, so you can usually find something laying around if you don't have that exact size.
Leaving the equipment off for a long time can damage the caps. It's very frequently the first thing replaced on old equipment that hasn't been powered up for a long time.
yep.
Well as these are both the same cap, couldn't hurt to replace both. The solder points are quite easy compared to some of the other ones. I don't have a solder station, I just use a full size iron, so I should be able to do these with ease. I don't know a lot, do I just buy any anything listed as 470uv 35v?
That capacitor on the left is defective. I would replace both of them.
Those capacitors seem to be in parallel, you could also put a single 1000uF one or similar, value is not that important since tolerance is usually 20%.
To prevent larger components from breaking off due to vibrations or shocks.
It's not uncommon for transformers to break off in cheap chinese power bricks due to a fall, this is why all the good ones are almost completely filled with it
>Those capacitors seem to be in parallel,
capacitors next to each other are not automatically parallel.
>Those capacitors seem to be in parallel,
They are, but physical size may be a factor.
It's just as easy to put it back to designed form.
Get a higher voltage on the new caps. They will probably last longer.
I’ve got lots of devices from the 60’s that have electrolytics and they still work fine sine they were a overbuilt (and maybe used PCBs in the dielectric oil, which was good stuff).
that cap on the left looks swollen, OP. That's a sign that it needs replaced.
>do I just buy any anything listed as 470uv 35v?
well I recommend buying nichicon or rubicon. voltage can be 35v or slightly higher never lower.
I menat rubycon
Also, why do they partially cover the board in that silicone goop? It didn't seem to serve any waterproofing, adhering, or noise reducing properties. Just made me wonder if it was cum.
To reduce hum, but whoever did it really spooted it kinda randomly.