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Hi Sam and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the Vizio TV.
Appreciate the additional information.
Please confirm that the DirecTV receiver only has the yellow + red & white RCA A/V jacks.
Have you checked the side rear panel?
I only HDMI ports are available, then the only approach possible would be to make use of an add-on device that would convert that DirecTV receiver's analog A/V outpout into digital HDMI.
Would this be an acceptable workaround?
And would a link to where such a device can beinquired / purchased serve your need please?
Please click HERE to evaluate / consider.