To change Input on the Dynex television without the remote, a person can use the channel selector buttons. Change the channel manually to the lowest possible number, then go lower until the right Input is reached.
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Depending on the exact model number, there might be different ways available for you. Although, the most simple way to get the TV into input mode for most models is to change the channels until you reach the first/last channel on the TV. Then channel up (or down - depending on what way you went before) again once more and the TV will automatically try to scroll through the inputs.
You will have to do this manually. You can use the buttons that are on the TV to help change out the input.