How to Troubleshoot LCD TV Screens
Liquid crystal display televisions provide high-definition pictures with greater contrast and detail than older sets. The sets have a smaller footprint than square cathode ray tube screens and can display input from formats such as HDMI and component video. Like any other electronic device, LCD TV sets may sometimes need a little troubleshooting to ensure they are operating in the best condition.
Press the "Power" button so the screen's LED light glows, then press "On" on the remote control. Many LCD screens require this two-stage process to be completed before the screen will switch on, which can be confusing if you are used to the one-touch activation of a CRT screen.
Unplug all external devices and disconnect the set from mains power. Check all plugs and sockets to make sure no dirt or particles are obstructing the connection, then replace all cables, pushing the plugs securely into place.
Cycle between channels by pressing "Channel +" or the "AV" button. Ensure that all external devices, such as DVD players, video games and satellite receivers, are connected.
Press "Vol +" until the volume is set to at least 50 percent. Check that the external device you are trying to view is not set to "Mute" by turning the volume up on its remote.
Open the "Picture" menu and set "Brightness" to around 55 percent. Set "Contrast" to 100 percent then work downward until the picture is clear without excessive bright or dark spots.
Move the television out of direct sunlight or strong directional lights. These can interfere with picture quality and damage the screen if it is left under them for too long.