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If you haven't already, try connecting a different HDMI device to HDMI3 and 4 to verify if the ports are working. If they are not, try power-cycling your TV by turning it off and unplugging it for an hour, then try connecting the devices again. If the ports still appear non-functional, your TV may require repairs. In-home service can be obtained by calling our Product Support team at 800-305-2204.
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