Hello Darijo,

this sounds like a broken regulator in the powersupply, which gets
corrupted when heating up.

I'd suggest not to switch the synth on again. If the Monopoly is running
with on supply-rail missing, the non longer available VCO chips might be
killed.

If you are not experienced in doing electronics repair, then give it to
a repair shop (if you would be experienced, you would not have to ask
here...).

Florian

Darijo Berkes wrote:

>
>
> I have a Korg Mono/Poly with a strange error.
>
> When I turn on the MP4, it looks like everything is fine, but after some
> seconds all LEDs turns on (for all VCO, Key Assigne buttons, Effect),
> Sometimes the one or two of the OSC LEDs kan start to flicker. Nothing
> happends if I press any of the "Key Assigne" buttons. If i turn on the
> volume to maximum and set the "Output" switch to high I get some kind of
> noise sound and it doesn't matter what key I press on the keyboard, I
> only get this noise sound.
>
>
> Anyone idees what it could be
>
>
>