I have the Bravia, recently purchased. Something keeps timing out and I keep losing signal between the TV and the cable box; "No signal. Check the external input or select another input using the INPUT button". After resetting the cable box, it syncs back up. This only started when I changed TVs.
Thank you for your message and we regret to hear about the issue you currently have. If by any chance you still get the same message stating that the TV has no SIGNAL you may perform the following steps to isolate the issue:
If using direct cable or an over-the-air antenna, the channel set up feature in the TV menu should be re-activated so that the TV can re-scan the active channels. This is also known as the auto program feature of a TV.
If you have connected a satellite receiver, a cable box, digital converter box, or a video cassette recorder (VCR) to the TV using a coaxial cable, the TV should be in the base channel, which is Channel 3 or 4. To set the TV to the base channel, use the TV's supplied remote. Once reception is being received, use the bundled remote control of the connected device to change programs.
The source device may be turned off or in a standby mode. Turn the device on.