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cano19781

Joined: 11 Sep 2014
Posts: 3
Location: Caracas

 Posted: Thu Sep 11, 2014 9:30 pm    Post subject: M50 Capacitor Trouble I'm from Venezula, and We don't have any korg services here, by the way, my Korg M50 doesn't work very well, you know a very famous capacitor trouble, I have a very good friend of mine, and he is an electronical engeneer, I would like to know which specific capacitor we need to replace because we try to fix my keyboard, please somebody help us.
remixcero

Joined: 01 Mar 2010
Posts: 8

pablolec

Joined: 19 May 2015
Posts: 1
Location: Argentina

 Posted: Tue May 19, 2015 6:51 pm    Post subject: hola, soy de Argentina y tengo el mismo problema, que se cuelga toda funcion en el KORG M50 y tengo que reiniciarlo. Me queda claro que son 2 los capacitores a cambiar, pero en que lugar? me han dicho que en la fuente de alimentacion y otros dentro del teclado. Por favor ayudenme, esto me esta volviendo loco!
yarasa

Joined: 27 Aug 2015
Posts: 1

 Posted: Thu Aug 27, 2015 10:01 pm    Post subject: If the capacitors are electrolytic, check if they bulged out. You can desolder it and replace it with the same one; the same value and voltage rating. If the capacitors are surface mounted check the connections of the terminals to the board. The connections may have detached due to some vibrations or mishandling of the unit. To fix this you could reheat the solders and have the solder reflow._________________electronic contract manufacturer
michelkeijzers
Approved Merchant

Joined: 08 Feb 2007
Posts: 9050
Location: Netherlands

 Posted: Fri Sep 09, 2016 10:03 pm    Post subject: I seem to have the same problem. My 3 scenarios when I switch it on: - Screen showing 'updating left panel, updating right panel, please switch off synth' - No buttons and joystick work, but all keys does (so I cannot change from program I-A000) - Everything works but for some seconds, than the previous scenario shows up I tried to reconnect most cables but without any improvement._________________ Developer of the free PCG file managing application for most Korg workstations: PCG Tools, see http://pcgtools.mkspace.nl
viya0414

Joined: 24 Aug 2017
Posts: 1

 Posted: Thu Aug 24, 2017 3:26 am    Post subject: If the capacitors are surface mounted check the connections of the terminals to the board. PCBA Assembly
roc1

Joined: 26 Dec 2018
Posts: 2

 Posted: Wed Dec 26, 2018 7:50 am    Post subject: I can attest, remixcero's solution works. Here is what I did: 1. I soldered a second low resistance tantalum 100 uF SMD cap in parallel to the existing C37 (didn't take the existing one out). My keyboard is a different board revision and it doesn't have C153. 2. Cleaned up the gobs of flux residue on the PCB and remelted all contacts covered by the flux. Leftover flux corrodes solder joints! One of these fixed it. Cross-posting in this thread which is on the same topic.
Alp
Junior Member

Joined: 09 Jan 2010
Posts: 59

 Posted: Fri Feb 01, 2019 1:12 am    Post subject: I have images of the two capacitors. They are on the opposite sides of the same board. I replaced the original capacitors with regular electrolytic. I THINK they were originally Tantalum. The keyboard worked well for a number of years but now I am having some issues. [img]E:\text\korg\korg cap 1.jpg/[/img] [img]E:\text\korg\korg cap 2.jpg/[/img]Last edited by Alp on Fri Feb 01, 2019 1:21 am; edited 1 time in total
Alp
Junior Member

Joined: 09 Jan 2010
Posts: 59

 Posted: Fri Feb 01, 2019 1:13 am    Post subject: OK, so how do I insert images from hard drive into post?
voip
Platinum Member

Joined: 27 Nov 2014
Posts: 1961

 Posted: Fri Feb 01, 2019 8:55 pm    Post subject: Korgforums doesn't store any images. In order to get images into a posting, upload the files to a hosting website, then link to them in the message. For example, the schematic a few postings above this one, is actually at: http://sia1.subirimagenes.net/img/2014/10/20/141020084211552396.png I tend to use an adblocker to prevent images from coming up, since they can sometimes be intrusive. A link might be preferable.
Bobcat22

Joined: 12 Nov 2018
Posts: 39

 Posted: Tue Feb 19, 2019 7:19 am    Post subject: Now Blank Screen Prior to the existing problem, I replaced the 2 capacitors. The unit would freeze. Then the screen is just white/blank. This M-50 was hardly used and looks new. bc
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