Korg Forums

I guess I'm done with this one then, thank you both for your support and help.

Cheers.

I've tried self checks before and they didn't work because it isn't booting up, and these combinations don't give any response either. I don't have an oscilloscope, they aren't easily available here where I live. Also I wanted to ask, above the removable chips there is a solder pad marked high and ...

I reseated them but still nothing, I have no idea what could be wrong enough to cause it to not boot. Tell me if there's something else I can check and see. I really want this to work.

You mean to remove the rom chips and then put them back in?

I did as you said and shorted pin 13 of IC45 to ground while measuring pin 10 and it behaved like it was supposed to, the output went from 4.5v to 0 and then back up again when I removed it. But the keyboard still did not boot and nothing happened on the screen, just the usual lines were there . I ...

I verified and indeed pin 10 of IC45 which is also going into the mpu is 5 volts and the psu is working fine.

It seems as though I've been an idiot and to correct my mistake the IC is receiving 5.0 volts at input and outputs 3.8v which then feeds into the positive terminal of the 50v 1uf capacitor. It may be that I'm still wrong so please correct me, but with this conclusion it still seems that the IC is ...

Wow thanks for this info, I'll check it again asap I may have checked the voltages wrong, but my main concern is that should a voltage drop like this be able to cause the keyboard to not boot? I guess there's really only one way to know, I will have to dig in the circuit diagram to know why this is ...

Hello again, I've found what seems to be the problem on the logic board of my korg, a reset IC (responsible for resetting the cpu and mpu reset lines) is pulling the cpu reset line high constantly and thus the boot sequence is not getting initiated. Normally the IC would pull the line high and low ...

I completely understand your concern and like I said you don't have to do it, thank you for your help, I will indeed look into this other korg but I doubt it will ship to asia where I live, thank you for reviving this post. I hope I get my t3 fixed up one day. That said if you could provide me with ...

I really appreciate your determination to help me buddy and I appreciate it, Although asking for voltages from a working t3 is not needed because all service manuals have voltages which I have verified from, what you can do to assist me is check if your t3 will boot without the front panel connector ...

Finally a reply!, yes I did change them myself and changed them with the proper part, I checked the entire panel myself again for any cold solder joints or excess flux and then put it back in. The floppy drive in this keyboard wasn't working beforehand so I just didn't use it but the keyboard just ...

Hi, I've had a korg t3 ex for a while in working condition and the buttons were getting old and unresponsive so after replacing them and testing them the keyboard no longer boots up, just some lines on the screen none of the buttons light up and no sound from the outputs either. The battery is the ...