Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 8

Can't transmit HDMI to my TCL Roku TV

I bought an USB type C to HDMI adapter to transmit my Samsung Galaxy S8 screen to the TCL Roku TV, since the wireless cast is not working good. It didn't work, the customer support says that the adapter only works for 60hz refresh rate and my TV is 120hz.

I tried the adapter in another old cheap TV and it works good so the issue is the TV refresh rate.

What can I do to change the refresh rate?
Since wireless casting is not an option (don't know the reason why my phone disconnects like every 5 minutes or less) I don't have wifi in my area or unlimited data, that's why I thought the cable was a good plan.
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