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Input button on side panel of TV is only button to change the input source, you would press same Input button on TV remote as well to do so.
It is quite possible the input button on side of TV is defective so I would suggest to press it a few time bit harder and hopefully it will work. There is no other button will work to change input of TV other than Input button. Remote control for this model is available at following supplier for $10
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ah OK, press Input button repeatedly to toggle the different inputs and stop pressing it when get desired input on TV.