Bought a used Rv with Jensen tv and an RCA DVD player there is also a box below the DVD player naned winegard it has DVD sat ant VCR cable for main tv then next is same thing but VCR/tv3/ also second tv. I can't get tv to show any picture or connect to DVD I went to menu and it won't let me get past pictures /audio/time/setup/ lock/channel it just keeps going back to component 2 The source is tv av1 zv2. A video component 1&2 hdm1 hcm2. Then VGA can you help