M50 left channel dead

sphere76 · Post by **sphere76** » Fri Dec 03, 2010 4:42 pm

Hi

This must be a hardware problem but i wonder if anyone has had the same problem. The internal left channel seems to be almost dead. Sound level is really low and noisy when panned left.
The same happens on headphone jack.
Sound panned to right play well also in "left jack" so is it motherboard problem or something?

regards,
Jari

DoctorMo · Post by **DoctorMo** » Fri Dec 03, 2010 5:05 pm

Sounds like a problem with the bad caps. We had the same problem, but I can't remember which channel.

You could crank the gain, on the mixer, to get the channels to match, but the bad channel would sound scratchy. Plus, you don't know when it would start working and then overload the mixer channel.

Replacing the caps seems to have resolved our problems.

mike

aaronpico · Post by **aaronpico** » Sat Dec 04, 2010 4:38 pm

Had the same problem - twice in a little over a year. It's in for repair as I write this.

KapnKrunch · Post by **KapnKrunch** » Mon Jul 18, 2011 4:53 pm

This just happened to me. It's actually the right channel that died - it's extremely weak and static-y.

Was a capacitor replacement the ultimate remedy?

Thanks -

Bill

DoctorMo · Post by **DoctorMo** » Mon Jul 18, 2011 7:31 pm

We ended up having to send the M50-61 back, a second time, to have the system board replaced.

It still tends to lock up, but it can be fixed by changing a preset, then back.

We think there is a problem using a non-Korg damper pedal, as well.

We also have an M50-73 that hasn't had any problems, yet.

mike

KapnKrunch · Post by **KapnKrunch** » Wed Aug 31, 2011 3:40 pm

Follow up: I brought my M50 to a warranty repair shop, and they repaired a "defective jack" (under warranty), but unfortunately the problem reappeared just after I got it home.

I purchased it from Sweetwater 6 months ago, and called them requesting a replacement. They agreed to do an ADVANCE exchange, didn't charge my credit card, and I had a replacement keyboard in 2 days. They even covered return shipping costs.

DoctorMo · Post by **DoctorMo** » Wed Aug 31, 2011 6:17 pm

Sweetwater is great. We got our keyboard through them, as well. They have excellent customer service.

mike

DoctorMo · Post by **DoctorMo** » Wed Sep 21, 2011 10:00 pm

Update: We left the M50-61 on for several hours the other day. When we came back home, the thing was locked-up, again.

*sigh*

mike

steve1 · Post by **steve1** » Sat Oct 15, 2011 9:16 pm

jari
also had the exact same problem it went in to repair (disrepair) and it came back almost the same. it going back next week,,,,Its a KORG problem they wont own up to..... out of warrenty now,, Guitar Center wouldnt stand behind it when i took it back, Working with George's Music now. Much better C/S

Pavel Fomitchov · Post by **Pavel Fomitchov** » Sun Nov 06, 2011 2:22 am

sphere76 wrote:The internal left channel seems to be almost dead. Sound level is really low and noisy when panned left. The same happens on headphone jack.

I got the same problem. If it is a bad jack, I can probably repair it myself, but if it is more serious, may need to go to repair shop. What was the reason & cost of repair in your case? Thanks.

steve1 · Post by **steve1** » Sun Nov 06, 2011 2:30 am

Reason? First the repair shop had it diagnosed wrong they said it was a power supply issue,,,,, "No" i said, try again. The tech there the said it was "miswired, and crimped wiring". I got it back, about $250.00 later,,It is better, though still very very noisey if you get anywhere near touching the 1/4 inch jacks going into the left /right inputs in the back of the keyboard.
Its definately a KORG design problem, which they wont own up to. The input jacks seem to be sealed together in a small 'box' inside the keyboard, you cant just get to one individual input jack ie, left or right.
Its working, and its still one nasty machine, but, its very very finicky.

hope this helps

Stv/Pa

BlacksmithVRS · Post by **BlacksmithVRS** » Tue Nov 26, 2013 8:27 pm

Another way of solving this (that worked for me) is to crank up the volume and hit the low notes as quick, hard and as many as you can. Obviously, watch out for the noise. My M50 has the left channel with this issue, and when I play this in A001 patch (Mono M3 Piano) after some consecutive note hits it will get back to normal.

prkravi · Post by **prkravi** » Thu Jan 09, 2014 11:18 pm

Same problem with my M50! Looks like a universal issue.
Hope Korg could release a Firmware upgrade or something for this problem..
Any one from Korg can please help?

prkravi · Post by **prkravi** » Tue Apr 22, 2014 5:03 pm

Blacksmith!! Thanks a Ton! God Bless you! It worked!!!
A001 Patch, Headphones, Volume Cranked up, Hit the Lowest Octave in Rapid succession...I couldn't believe my ears when I heard the Stereo sound after almost a year!
I was contemplating sending it for service, selling it off etc. But you were my Angel today, Thanks again!!

BlacksmithVRS · Post by **BlacksmithVRS** » Tue Apr 22, 2014 7:16 pm

@prkravi No problem friend! We're here to help

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M50 left channel dead

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