EM thanks for the extensive reply. Those are some good suggestions. I just need to figure out getting some alternate sources of composite and/or HDMI signal to test.
All my TVs work with regular RF from a digital converter box.
The composite to RF box is a powered one, an RCA.
The HDMI to composite cable is an eBay special, which I tested on a newer flatscreen with my MacBook as the source but was a no-go.
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