Hi @Patel_Sandeep_H,
Welcome to the Roku Community!
I will do my best to assist you to see how we can help get you up and running.
How are you powering the device? Is it plugged into the TV USB port, or is it plugged into the wall outlet with the provided cables? In addition, have you tried using another HDMI port on your TV as well as trying your device on another TV to see if you are seeing the same issue with no signal?
See more tips and troubleshooting steps for this type of issue here: What should I do if I see the "Low signal strength" message? | Official Roku Support
Please keep us posted from there if you need additional help.
Many thanks,
Mary