Facing TV Problems? Ask a TV Technician.
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You don't actually set or force the Vizio to go to 120 hz mode, the set refreshes whatever signal is sent to it 120 times per second (120 hz). The resolution you see on your screen is directly dependent on the "Source" (meaning the cable/SAT box, DVD player, etc.).
That said, what exactly is the problem you're having right now?
Also what source are you playing on the TV where you're having the problem (for example: cable box connected to the TV via HDMI, etc.)?
In other words your TV is always in 120 hz mode, so if you're having picture issues, then it's your "Source" causing the problem, not your TV. Please reply back with details so we can proceed.
If you're saying you're unsatisfied with my help and this is your first reply with any specific information then I will opt out. If you're saying you're unhappy with the picture, then let me know the model of the DirecTv box and we can proceed.
You're only going to see the resolution the DirecTv box sends the TV, and the best would be a DirecTv HD box connected to the TV using HDMI, with varied quality from channel to channel. The resolution is set by the DirecTv box. In order to help further, I need the specifics of that box since the issue is not your TV. Let me know.