Losing the remote for your Roku TV is a common nuisance, but thankfully, there are several ways to power it on without the remote. Below are some methods that you can use to turn on your Roku TV without the need for its remote:

1. Use the Power Button: Most Roku TVs come with a physical power button either located on the underside, the back, or the sides of the TV. It might be a single button that controls both power and input selections or separate buttons for different functions.

2. Mobile App: Roku provides a mobile app that can be used as a remote control. Download the Roku app on your smartphone or tablet from the Apple App Store or Google Play Store. Ensure your device is connected to the same Wi-Fi network as your Roku TV. Open the app, and use it to turn on and control your TV.

3. Using Smart Speakers: If you have a smart speaker like Amazon Echo or Google Home, and you previously set it up to work with your Roku device via skills or actions, you can use voice commands such as “Alexa, turn on Roku” or “Hey Google, turn on my Roku TV.”

4. HDMI-CEC Functionality: Some televisions have an HDMI-CEC (Consumer Electronics Control) feature that allows HDMI devices to control each other. If you have a compatible device like a cable box or gaming console connected via HDMI, turning that device on can often power on the TV as well due to CEC functionality.

5. Universal Remote: A universal remote can be programmed to control multiple devices including your Roku TV. Consult the manual for your universal remote for instructions on how to synchronize it with your television.

Remember that specific steps for these methods may vary depending on your particular Roku TV model, so if one method does not work immediately, consult your user’s manual or contact manufacturer support for model-specific instructions.