Vertical lines in TV's AV mode--cause?

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Hello. After much careful research and comparison testing, I finally settled on a Philips-Magnavox TS3259C 32" television -- $429 demo unit on clearance from Sears (who often have great deals by the way).
After bringing the TV home and connecting it to my Toshiba SD-1200 DVD player, my wife and I immediately noticed alternating vertical bars of lighter and darker black when the TV was switched to AV1 and AV2 channels. These bars were still slightly noticeable during DVD playback in letterbox mode. However, they are not visible when viewing cable broadcasts.
My question is, what is causing this distortion? My theories include electrical interference from power cords, signal from nearby devices (receiver, VCR, DVD, CD player), or the TV itself in which case it's going back! The S-video cable is a quality Monster Cable I picked up for a direct DVD-to-TV connection. I am using an F-connector from my VCR for the cable channels. (A second question: would using a cable with RCA connectors from VCR to TV improve the picture?)
BTW, I moved my speakers 20' away from the TV and this did not help. Any advice would be much appreciated!

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Topic - Vertical lines in TV's AV mode--cause? - Dalancroft 10:41:42 06/21/00 (4)

Re: Vertical lines in TV's AV mode--cause? - MikeP 15:43:06 06/21/00 (0)

Re: Vertical lines in TV's AV mode--cause? - Victor Khomenko 14:32:41 06/21/00 (2)

Thanks, Victor - Dalancroft 15:35:38 06/21/00 (1)

Moved DVD away from TV -- problem fixed! (nt) - Dalancroft 10:19:06 06/23/00 (0)

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