Hi i want to share this issue.
my friend buy on ebay this nice old Yamaha Receiver i believe it sold "AS IS"
the problem was no sound nothing out to speakers.
i found that 1 of the Power stage IC IG02990 send full rail dc voltage so the DC protection do the job and the amplifer at Protection status.
any way we try to find the original IG02990 Power IC but all of them are Chinese FAKE so the best solution was to use 2 real discrete Power Output stage with the Class AB Motronix PCB. all the wires and connection are fitted to the original Power IC legs at the main PCB
The result? amazing quality sound and even better power output that increase to 45W RMS @ 8Ohm. also i need to move out the Volume Potentiometer out and clean it
Here is some pictures
my friend buy on ebay this nice old Yamaha Receiver i believe it sold "AS IS"
the problem was no sound nothing out to speakers.
i found that 1 of the Power stage IC IG02990 send full rail dc voltage so the DC protection do the job and the amplifer at Protection status.
any way we try to find the original IG02990 Power IC but all of them are Chinese FAKE so the best solution was to use 2 real discrete Power Output stage with the Class AB Motronix PCB. all the wires and connection are fitted to the original Power IC legs at the main PCB
The result? amazing quality sound and even better power output that increase to 45W RMS @ 8Ohm. also i need to move out the Volume Potentiometer out and clean it
Here is some pictures
Attachments
Last edited:
- Status
- Not open for further replies.