I think this is the equivalent https://www.digikey.com/products/en?mpart=EKMQ401VSN271MQ40S&v=565 height might be an issue though. The QR code on the cap reveals nothing online. Is there anything else I should look at for equivalency? Thanks
Quote from: JimBoot on 2020.05.23, 05:16:01
I think this is the equivalent https://www.digikey.com/products/en?mpart=EKMQ401VSN271MQ40S&v=565
Is that other large cap swollen? You might need two
Also check your input rectifier and make sure the diode junctions are all good. That cap shorting out could have taken some pn junctions out
Dave
Thanks dave I was going to replace the other one as well. I might just replace the rectifier as well now. Thanks
Quote from: JimBoot on 2020.05.23, 05:30:51
Thanks dave I was going to replace the other one as well. I might just replace the rectifier as well now. Thanks
Looks like there is also a fuse with through-hole leads coming off of you ac input (I think) you may want to check and possibly replace
As for cap dimensions, just measure it and make sure you get the size constraints right as well as capacitance, voltage and footprint. This might work as its smaller than your first link.
https://www.digikey.com.au/product-detail/en/nichicon/LGL2G271MELA30/493-7504-ND/3884127
Hi Jimboot,
Electrolytic capacitors are the weak point of electronics. I recently had to change three of them every few months in a satellite receiver that was only six years old. These capacitors in the power supplies withstand high currents, but for reasons of economy, engineers don't size them enough, so they heat up, and a capacitor that heats up degrades faster.
They can be replaced by any capacitor of the same capacity and voltage or higher voltage, but if possible bigger so that they don't have the same problem later on. The capacitors with "low ESR" are the best (lower serial resistance, but this information is not always available).
Then, it's all a question of space in the box to put them, sometimes you have to connect them with extra wires, it's not a problem if the wire section is sufficient (diameter > 1 mm is generally enough).
F6,
You make a very good point. When replacing failed Electrolytic Capacitors or
Tantalum Capacitors I select a replacement, space permitting, of at least 50%
more capacity at a somewhat higher voltage rating.
I replace the Surface Mount Electrolytics with wired radial electrolytics by the same
philosophy. Small is not better as I see things.
Quote from: F6FLT on 2020.05.23, 17:49:11
Hi Jimboot,
Electrolytic capacitors are the weak point of electronics. I recently had to change three of them every few months in a satellite receiver that was only six years old. These capacitors in the power supplies withstand high currents, but for reasons of economy, engineers don't size them enough, so they heat up, and a capacitor that heats up degrades faster.
They can be replaced by any capacitor of the same capacity and voltage or higher voltage, but if possible bigger so that they don't have the same problem later on. The capacitors with "low ESR" are the best (lower serial resistance, but this information is not always available).
Then, it's all a question of space in the box to put them, sometimes you have to connect them with extra wires, it's not a problem if the wire section is sufficient (diameter > 1 mm is generally enough).
Thanks F6 I've learned something.
Switching supply caps typically suffer this on the output stage. Those look to be input stage. 400v? 220 in? Should be ok. In your case the caps are probably of poor quality.
For just a bit more, Id go with the rubycon caps https://www.digikey.com/product-detail/en/rubycon/400MXK270MEFCSN25X30/1189-2655-ND/5023839
Mags
Quote from: muDped on 2020.05.23, 19:22:10
. Small is not better as I see things.
I agree. Size constraints are the dictator but I would go with the largest size and lowest ESR for heat dissipation purposes if possible.