I had the same problem on my 890 (8080) receiver. After reading the many threads on this topic I made a decision. The fusible resistors and caps really should be updated on these boards and were likely the cause of my problem. Since I'm not experienced like many here, rather than spending time pinpointing with 100% certainty the exact cause of the problem (and since the replacements only cost a few dollars) I just replaced all the fusible resistors and caps. Worked like a charm. Even though I never isolated the exact reason it was in protection, I was pretty sure my approach would work.