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Try the Power On feature, when enabled, your TV turns on displaying the last used input. Go to Settings > Display and Sound > Power Controls > Power On > and select Last Input.
Sorry, there was a problem. Please try again later.In the settings under power you can set the settings to do that it'll ask what you want to come on you can I'm sure you could set it for third input. Or when you're on the input on the main screen hit like a star button and a screen will come up and you can do a quick set most TV should have that. Some TVs have more settings than you'll be able to figure out takes time.
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