Facing TV Problems? Ask a TV Technician.
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, is the no sound issue commonly observed even with the Magnavox 32MF338B/F7 in any SOURCE/mode; DTV/TV, Video 1, Video 2.........or a DVD player, cable box, game console (if so connected) ?
Can you please try unplugging both the TV and the DirecTV receiver for an extended period of time?
The idea is to simulate a soft reset of the devices.
...an hour or so.
That would be a soft reset; discharge/dissipate residual power inside the circuitry.
That would be the only easy user doable attempt.
All others would involve checking physically the cable connections or even replacing the yellow + red & white RCA-to-RCA cable.
It may also require using the jacks for Video 1
...or depending on the model of the DirecTV receiver, use another connection method such as HDMI.