Page 1 of 1

RB411 Capacitor replacement

Posted: Mon Jul 23, 2012 9:51 pm
by jober
I have around 30 bad RB411 boards. Some have bad Capacitors so I changed them out with 680 6.3v caps. The replaced caps were 560 6.3v.
Will this cause any damage or odd problems with the boards I have repaired with the 680 caps?

Re: RB411 Capacitor replacement

Posted: Mon Jul 23, 2012 11:47 pm
by taduikis
Absolutely not at all.

Re: RB411 Capacitor replacement

Posted: Sat Aug 25, 2012 6:33 am
by guipoletto
In fact, all the units with 560*6.3 caps will at some time stop working... new units ships with 680*6,3 caps, so it was certainly subdimensioned. when it becomes to PSU-filtering caps, the more the better...

Re: RB411 Capacitor replacement

Posted: Thu Aug 30, 2012 1:04 am
by frankie
I had replaced on 8 different boards (RB411, RB411AH, RB433, RB433AH, RB333, RB600, RB750, RB750G) the 560uF/6.3V capacitors by Rubycon MBZ 820uF/6.3V. All works more than 6-12 month without problems.

Re: RB411 Capacitor replacement

Posted: Thu Aug 30, 2012 4:58 pm
by meshnet
We are replacing these almost 10-20 a week these days.. Texas heat,
bad caps don't mix.. really costs me a lot of money. We just go ahead
and refurb them with all new caps (3-4 or so on the 411 )

Richard

Re: RB411 Capacitor replacement

Posted: Mon Sep 10, 2012 4:37 am
by karina
I have successsfully reparied a faulty RB1000. the unit was locking up with no access. a power cycle fixed it for a day or two. I replaced the unit and was about to bin it when I read posts about the bad caps. Sure enough it had swollen caps of the green and gold type. Replaced all four caps on the board and is now running 100%

Re: RB411 Capacitor replacement

Posted: Wed Sep 19, 2012 5:32 am
by npyoung
So, what are the run times on these boards before problems emerge? I'm seeing boards fail right at 4 years in service...but I don't know that this is the problem. My RB411's fail but still power up as far as lights go, but no ethernet, no boot. Anyone know when MT changed the design and started using better/bigger caps? Or do I get to look forward to replacing all my MT stuff?

Re: RB411 Capacitor replacement

Posted: Wed Sep 19, 2012 11:19 am
by karina
My RB 1000 worked for almost 3 years before the caps failed however I have had a RB333 fail within a week of service so there is no timescale. If your boards have these caps they will fail there is just no telling when. Hence I do not take the gamble and swap caps before deployment. It seems there are still a lot of Boards with these caps in circulation as I have just received another RB433 from my supplier with the them on board. Honestly, if you can use a soldering iron it takes minutes to swap them, replacement caps are only a few cents each. Much cheaper that returning them to the supplier.

I use Nippon Chemi-Con 820uf/6,3V 105ÂșC caps from http://www.diyaudio.es None of these have failed as yet.