Oops! Yes, I mean Composite Video output ports. I only have 2 inputs - Disk1 for DVD and VCR1 for the VCR. Both of them output fine to the main port (i.e. 1st port). When I connect a 2nd TV to the 2nd or any of the other Composite video ports, there is no signal.
I got the answer from Proceed Tech Support. The path "remote" or "both" option on the front panel needs to be turned on, for simultaneous video on all out ports. Default switches video to only the "main" port.