Hey all,
I have a Yamaha RX-V679 that is entering protection mode after a few seconds of turning on. Shows "DC PRT 77H" error when I disable the auto protection.
All speaker terminals read ~0.4 volts across, except for the surrounds, which read 0 volts for right and ~0.9 volts on the left, which increases until the receiver kicks off. I'm thinking this is my problem child.
I took it apart and started testing the main output transistors, and didn't see anything blown open (I did this without desoldering, however I compared to nextdoor channel and all were very similar). The attached picture shows the transistors. Attached picture shows them.
Question is, what is my next step for testing?
Thank you for your help!
Service manual is located here, too big to attach
https://drive.google.com/file/d/1VtI...ew?usp=sharing
I have a Yamaha RX-V679 that is entering protection mode after a few seconds of turning on. Shows "DC PRT 77H" error when I disable the auto protection.
All speaker terminals read ~0.4 volts across, except for the surrounds, which read 0 volts for right and ~0.9 volts on the left, which increases until the receiver kicks off. I'm thinking this is my problem child.
I took it apart and started testing the main output transistors, and didn't see anything blown open (I did this without desoldering, however I compared to nextdoor channel and all were very similar). The attached picture shows the transistors. Attached picture shows them.
Question is, what is my next step for testing?
Thank you for your help!
Service manual is located here, too big to attach
https://drive.google.com/file/d/1VtI...ew?usp=sharing
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