LCD televisions experience problems due to internal damage or the accidental change of settings. If you have a set that turns off, doesn't show video or doesn't properly render sound, troubleshooting can help you determine if these are problems you can fix or if you need to have your TV serviced.
An LCD TV may experience power issues. When it turns off and on by itself, it is power cycling, which is caused by a problem with the capacitors inside your TV. Reset the TV by unplugging it from the wall and then pressing and holding the "Power" button for 15 seconds. Plug the TV back in and turn it on. Take your TV to a technician to replace its capacitors if the power cycling continues.
When your TV displays a blank screen, determine if the video source is the problem by pressing the "Menu" button. If the TV menu appears, the problem is with your TV or video service. Press the "Source" button on your remote and set your TV to the same source as your video input, such as your game console or pay-TV service. Make sure cables are properly attached to your TV and video source.
LCD TVs often come with sound settings that cause problems, such as the capability to turn off built-in speakers or to interrupt the link to external speakers. Open your TV's settings menu and ensure that the speakers are set to "On." Turn off the surround sound settings, often labeled as SRS, if you do not have a surround sound system. Your TV is connected to an external speaker if you see a message such as "Not Available" when you try to turn up the volume. Turn up the volume if you use external speakers and turn off the mute option on each of your controllers.
Sound With No Video
One indication that may signal damage to your TV or other device is hearing sound but seeing no picture on your screen. Check that your devices are properly connected. Also, test your devices with new cables to confirm the devices are working correctly. A problem with your device or internal damage to your TV is the likely culprit if your devices are properly connected and problems persist with new cables. Press the "Menu" button on your remote; if you see the menu, then your video device is likely malfunctioning.