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Went to update to 3.0.2 - DEAD KRONOS. :(
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lotty1
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Joined: 29 Jul 2010
Posts: 515
Location: england
PostPosted: Mon Feb 09, 2015 7:47 pm    Post subject: Reply with quote
GregC wrote:
http://www.ehow.com/info_8774532_causes-motherboard-fry.html

What Causes a Motherboard to Fry?

Motherboards can go bad for many reasons, although there are a few common culprits. Among the most common causes of motherboard failure are excess electrical shocks, physical damage, or excess heat.

Dust is also common fault for computer failing Exclamation
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Ohmnisphere
Kronos 73
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lonelagranger
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Joined: 17 Feb 2009
Posts: 291
PostPosted: Mon Feb 09, 2015 9:43 pm    Post subject: Reply with quote
I am also keeping my fingers crossed for you. You deserve some good luck after all this time. Yes, this is a great thread to have on the forum for people to refer to. It is very thoughtful of you to do this for all of us.
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McHale
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Joined: 10 Feb 2009
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PostPosted: Mon Feb 16, 2015 9:30 pm    Post subject: FINALLY Reply with quote
So after all this time, I installed the new MoBo that I picked up on ebay. That fixed the issue. I still have to mount everything, put all the screws back in, seal it all up and give it a final once and for all, but lazily putting the MoBo in to test brought it right up.

Now to work on the old MoBo and see what happened. Again, in an off state, unplugged from the wall it should not have failed.

Thanks again to everybody for all the help and sympathy. I'm dying to get 3.0.2 on here and get reaquainted with my baby again.

-Mc
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Current Korg Gear: KRONOS 88 (4GB), M50-73 (PS mod), RADIAS-73, Electribe MX, Triton Pro (MOSS, SCSI, CF, 64MB RAM), SQ-64, DVP-1, MEX-8000, MR-1, KAOSSilator, nanoKey, nanoKontrol, 3x nanoPad 2, 3x DS1H, 7x PS1, FC7 (yes Korg, NOT Yamaha).
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BobTheDog
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Joined: 21 May 2007
Posts: 1535
PostPosted: Mon Feb 16, 2015 10:05 pm    Post subject: Reply with quote
Nice one, really pleased for you.
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lagrange



Joined: 30 May 2007
Posts: 4
PostPosted: Mon Feb 16, 2015 10:51 pm    Post subject: Reply with quote
McHale: So very glad you got to the bottom of the problem. Makes me glad I got a spare motherboard sitting here. Your thread was very informative to many member, I am sure. I hope you spend many hours making beautiful music with your self refurbished Kronos. It will sound better and feel better because you did the repair yourself.

Good luck to you McHale.
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McHale
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Joined: 10 Feb 2009
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PostPosted: Mon Feb 16, 2015 10:58 pm    Post subject: Reply with quote
lagrange wrote:
McHale: So very glad you got to the bottom of the problem. Makes me glad I got a spare motherboard sitting here. Your thread was very informative to many member, I am sure. I hope you spend many hours making beautiful music with your self refurbished Kronos. It will sound better and feel better because you did the repair yourself.

Good luck to you McHale.


Thanks brother. Don't forget that once you swap the motherboard, update the sub-system to the latest version (6.04 is the latest as of today).

So I updated the sub-system and the OS to 3.0.2 and put all the final screws in, everything is STILL working and it's like seeing an old friend you haven't seen in 20 years.

I'm going to keep updating this thread with motherboard info. Everything looks good on it under a magnifying glass. Tomorrow I'll start checking it out at the component level at work. I have a hunch on why it failed but don't want to say anything yet in case I'm wrong. Stay tuned though...

-Mc
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Current Korg Gear: KRONOS 88 (4GB), M50-73 (PS mod), RADIAS-73, Electribe MX, Triton Pro (MOSS, SCSI, CF, 64MB RAM), SQ-64, DVP-1, MEX-8000, MR-1, KAOSSilator, nanoKey, nanoKontrol, 3x nanoPad 2, 3x DS1H, 7x PS1, FC7 (yes Korg, NOT Yamaha).
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lagrange



Joined: 30 May 2007
Posts: 4
PostPosted: Tue Feb 17, 2015 1:36 pm    Post subject: Reply with quote
Very interested in what you find out. I am glad everything is moving right along for you. I am sure you are happy to have your keyboard up and running again.
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Shambler
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Joined: 28 Jul 2007
Posts: 109
PostPosted: Tue Feb 17, 2015 3:49 pm    Post subject: Reply with quote
Great result, I'd start with the capacitors!
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McHale
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Joined: 10 Feb 2009
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PostPosted: Tue Feb 17, 2015 3:57 pm    Post subject: Reply with quote
Shambler wrote:
Great result, I'd start with the capacitors!


All the caps tested fine. Visually, everything looks good. I don't think it's component related at this point.

-Mc
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Current Korg Gear: KRONOS 88 (4GB), M50-73 (PS mod), RADIAS-73, Electribe MX, Triton Pro (MOSS, SCSI, CF, 64MB RAM), SQ-64, DVP-1, MEX-8000, MR-1, KAOSSilator, nanoKey, nanoKontrol, 3x nanoPad 2, 3x DS1H, 7x PS1, FC7 (yes Korg, NOT Yamaha).
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AntonySharmman
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Joined: 16 Oct 2010
Posts: 3598
Location: Hellas
PostPosted: Tue Feb 17, 2015 4:32 pm    Post subject: Reply with quote
Shame on you ... Start with power mosfet switching transistors I've marked in circles , this is the first step of experienced technicians ,
especially the three close to main supply 24 pin clip !



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McHale
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Joined: 10 Feb 2009
Posts: 2487
Location: B.F.E.
PostPosted: Tue Feb 17, 2015 4:48 pm    Post subject: Reply with quote
AntonySharmman wrote:
Shame on you ... Start with power mosfet switching transistors I've marked in circles , this is the first step of experienced technicians ,
especially the three close to main supply 24 pin clip !




As always, MUCH appreciated. I'll be sure to check those next.

-Mc
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Current Korg Gear: KRONOS 88 (4GB), M50-73 (PS mod), RADIAS-73, Electribe MX, Triton Pro (MOSS, SCSI, CF, 64MB RAM), SQ-64, DVP-1, MEX-8000, MR-1, KAOSSilator, nanoKey, nanoKontrol, 3x nanoPad 2, 3x DS1H, 7x PS1, FC7 (yes Korg, NOT Yamaha).
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Ross Donald



Joined: 15 Dec 2020
Posts: 16
Location: Bristol
PostPosted: Tue Dec 15, 2020 7:09 pm    Post subject: Re: FINALLY Reply with quote
McHale wrote:
So after all this time, I installed the new MoBo that I picked up on ebay. That fixed the issue. I still have to mount everything, put all the screws back in, seal it all up and give it a final once and for all, but lazily putting the MoBo in to test brought it right up.

Now to work on the old MoBo and see what happened. Again, in an off state, unplugged from the wall it should not have failed.

Thanks again to everybody for all the help and sympathy. I'm dying to get 3.0.2 on here and get reaquainted with my baby again.

-Mc


I've read your thread with great interest.
I too have a Korg Kronus (88 model), from 2012ish, and one day it just went dead, having been on and working......Had a look inside, and noticed the motherboard light is illuminated.
I managed to acquire an identical motherboard, and wondered if I just swop it over, and take care of the firmware update after it boots up? Or if I have to do anything else before the swop?

Any advice is gratefully received.
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McHale
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Joined: 10 Feb 2009
Posts: 2487
Location: B.F.E.
PostPosted: Tue Dec 15, 2020 8:14 pm    Post subject: Re: FINALLY Reply with quote
Ross Donald wrote:

I've read your thread with great interest.
I too have a Korg Kronus (88 model), from 2012ish, and one day it just went dead, having been on and working......Had a look inside, and noticed the motherboard light is illuminated.
I managed to acquire an identical motherboard, and wondered if I just swop it over, and take care of the firmware update after it boots up? Or if I have to do anything else before the swop?

Any advice is gratefully received.


Just a simple board swap. Once you get it in, perform all your updates as necessary and you'll be good to go. The MoBo I ordered from ebay had 4gb of RAM already on it and I installed it as well.

Good luck. Let us know how it goes.

-Mc
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Current Korg Gear: KRONOS 88 (4GB), M50-73 (PS mod), RADIAS-73, Electribe MX, Triton Pro (MOSS, SCSI, CF, 64MB RAM), SQ-64, DVP-1, MEX-8000, MR-1, KAOSSilator, nanoKey, nanoKontrol, 3x nanoPad 2, 3x DS1H, 7x PS1, FC7 (yes Korg, NOT Yamaha).
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Ross Donald



Joined: 15 Dec 2020
Posts: 16
Location: Bristol
PostPosted: Tue Dec 15, 2020 8:35 pm    Post subject: Re: FINALLY Reply with quote
McHale wrote:
Ross Donald wrote:

I've read your thread with great interest.
I too have a Korg Kronus (88 model), from 2012ish, and one day it just went dead, having been on and working......Had a look inside, and noticed the motherboard light is illuminated.
I managed to acquire an identical motherboard, and wondered if I just swop it over, and take care of the firmware update after it boots up? Or if I have to do anything else before the swop?

Any advice is gratefully received.


Just a simple board swap. Once you get it in, perform all your updates as necessary and you'll be good to go. The MoBo I ordered from ebay had 4gb of RAM already on it and I installed it as well.

Good luck. Let us know how it goes.

-Mc


Gosh, you make it sound so simple!!!
I'm going to attempt the swop over tomorrow. I'll let you know how I got on.
Cheers!!!
Ross
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McHale
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Joined: 10 Feb 2009
Posts: 2487
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PostPosted: Tue Dec 15, 2020 10:35 pm    Post subject: Re: FINALLY Reply with quote
Ross Donald wrote:

Gosh, you make it sound so simple!!!
I'm going to attempt the swop over tomorrow. I'll let you know how I got on.
Cheers!!!
Ross


Be sure to replace the CR2032 battery on the replacement MoBo when you do. I forgot to and about a year later had to tear it down to replace it.

Good luck!
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Current Korg Gear: KRONOS 88 (4GB), M50-73 (PS mod), RADIAS-73, Electribe MX, Triton Pro (MOSS, SCSI, CF, 64MB RAM), SQ-64, DVP-1, MEX-8000, MR-1, KAOSSilator, nanoKey, nanoKontrol, 3x nanoPad 2, 3x DS1H, 7x PS1, FC7 (yes Korg, NOT Yamaha).
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