TV shows grey screen with cable but not with CHROMECAST But with sound

Idk whats going on. I have changed the HDMI cord and the cable cord and nothing. I can hear what the cable is playing but no picture, just a grey screen. But as soon as i connect the chromecast and change the channel to “strm box” on my home theater system (pioneer), the picture shows and you can hear whats playing.

Vizio 40” tv

Pioneer home theater system HTP-074

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