Topic: PS5 only plays audio for PS4 games

My PS5 only plays audio for PS4 games, not for PS5 games. Madden Upgrade, no audio. Bits and pieces for Spiderman MM, now nothing for Ratchet and Clank. Audio is fine for PS4 games. I have changed all kinds of settings, switched TVs, switched HDMI cables, nothing seems to work. Has anyone seen this and maybe have a fix? Feels as if I am missing something obvious, but can't figure it out. TIA

Thanks for your reply; no luck. My big screen is older, a Sharp Aquos Quattron 3D. But I also hooked it up to a Roku Element and Samsung N5300, both purchased within the last year. Same thing, PS4 games work fine, but PS5 video is fine, sound is all static.