can use use the roku stick that comes with an rca tv on another tv?(haier for example)
As long as it's not one of the original MHL Roku Stick (Model 3400, 3420) devices. Those will only work with a TV that has an MHL HDMI port. Unlikely any newer TV supports that anymore.
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The RCA came MHL Roku stick, so you can't just switch it to just another TV.