Facing TV Problems? Ask a TV Technician.
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Changing cords generally isn't the fix for a No Signal message, however changing the Input the TV is set to or rebooting your cable box usually is. Since I don't have any details posted here, I need to ask the following:
1) What's the model number off of the back of the Sony?
2) What's connected to it (Cable Box, DISH Box, etc.)?
3) What specific input is the box plugged into (HDMI, etc.)?
4) Do you have the original Sony remote?
The No Signal message can be caused by the TV's Input being changed, the HDMI cable failing, or Cable/SAT box needing to be rebooted.
Please unplug the Cable/SAT box from power and shut the TV off.
Disconnect and reconnect the HDMI cable between them on both ends- making sure it is secure.
Plug the Cable/SAT box back into AC and once it's rebooted turn the TV on, and use the INPUT button on the original TV remote to select the correct HDMI Input.
Let me know what happens.
If you still have no luck, then postback with the model number off of the back of the TV, the model of the cable box, and also the type of cable being used to connect the two.