Question about Onkyo HT-S790S System

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Sound, but no video

Our system was working for nearly a year. Then on evening after watching our cable tv through the onkyo theater system and shutting all components down as usual, the video quit working. The next morning upon start up, we could hear the cable tv through the speakers, but the tv showed the message "weak signal". We checked all wiring connections. All was intact. We tested the cable box. It works normally when connected directly to the tv. It just no longer works through the onkyo for video feed. We checked the manual for troubleshooting. None offered for video problems. We called. The tech could not solve the problem. Any ideas before we bring it in for service? I have seen the same problem in posts on other onkyo theater systems in this forum.

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The video is switched by a single chip similar to the one that switches the audio signals. It is possible that the chip is defective. Even as a shotgun approach, changing the chip shouldn't be more than $15-$25 for the part.
Keep us posted.

Posted on Apr 02, 2008


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Posted on Jan 02, 2017


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