If S-video plug is used to connect any component it takes control of the AV1 input. Plugging into the RCA plugs for that input will conflict with S-video.
Here is a manual:
http://insigniaproducts.com/cms/documents/NS-L32Q-10A%20UM%20EN%20V3.pdf
See "No Picture" in Troubleshooting section on page 52 for settings to be checked also.
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