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subq
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capacitor problem

Wed Jul 11, 2012 3:41 am

I have a building stack of 450G boards that are dead (bulging capacitors), did MikroTik ever resolve this? Do they warranty these things? I don't mind replacing the capacitors myself, does anyone have a link to the correct ones to use?
 
InoX
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Re: capacitor problem

Wed Jul 11, 2012 3:46 am

Use the same or higher voltage.
 
subq
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Re: capacitor problem

Wed Jul 11, 2012 3:54 am

old ones appear to be 580uF 6.3V

I actually have a newer board and it appears they changed to 680uF 6.3V

found an old thread that said look for oscon, not an electrical engineer, are there better specs I should be looking at? higher micro-farad, esr?
 
subq
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Re: capacitor problem

Thu Jul 12, 2012 9:21 pm

Anyone have online source they like for the capacitors (US)?
 
Radek
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Re: capacitor problem

Fri Jul 13, 2012 8:50 am

There are two main parameters for CAP. First is ESR (equivalent serial resistance at defined frequency - lower is better), the secon is ripple current (higher is better, generally ripple current increase with capacity).
If its possible to choose 105°C or 125°C design, choose them. The life time will be longer at the same condition than 85°C.

I used for DC/DC convertors Nippon LXZ/LYZ series capacitor in case of trough hole. In case of SMD capacitors seems to be polymer CAP (eg. Sanyo/panasonic/nichicon) good solution. Polymer caps are currently used for e.g. matherboards DC/DC convertors. There is lower capacity, but much higher ripple current.

In many cases I used trough hole cap from nippon instead of SMD - you can solder wires on PCB pad and fix cap eg by thermo-glue. It depends on package and requested value (higher nominal CAP voltage you use and the CAP life time increase)
 
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Aug
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Re: capacitor problem

Fri Jul 13, 2012 5:36 pm

I've used these to repair several rb450's.
Allied Electronics
Nichicon RS80J561MDNASQ

http://www.alliedelec.com/search/produc ... U=70188114
Aug
 
gmeden
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Re: capacitor problem

Mon Jan 21, 2013 6:59 am

Thanks AUG , just ordered a few. Saved me alot of time in looking up all the parameters for replacements.
 
Dobby
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Re: capacitor problem

Mon Jan 21, 2013 9:13 am

Deleted because not related.
Last edited by Dobby on Mon Mar 11, 2013 1:36 am, edited 1 time in total.
 
randallr
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Re: capacitor problem

Sat Jan 26, 2013 2:15 pm

I've replaced the cap's in about 30 411 boards as well. The 'green' caps that were used only seem to fail in the heat of the summer...
 
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Re: capacitor problem

Sat Jan 26, 2013 6:25 pm

@Dobby

They were RB450's. Not RB450G's.
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