Aleph 3: rail voltage as dc offset


2004-10-15 9:06 pm
One of the channels of my Aleph 3 suddenly has the entire + rail voltage as dc offset. Its a standard build per the schematic in the service manual and it has worked fine for almost a year. There was a popping sound in one speaker and the cones were in a sucked out state. (A frightening sight!).
The speaker survived, but now as I roll up my sleeve to take it apart and troubleshoot, I was wondering if someone here could point me to some obvious places to look for issues. I searched here a bit but couldn't find anything similar(rail voltage on the output) discussed.

Thanks for any pointers.