The Sony PDM 4200 is a 42-inch plasma TV that will occasionally experience glitches. The picture may need adjusting or condensation may form in the unit. You can solve many of the problems yourself before calling in a repairman.
Press the TV/VIDEO or INPUT button on the remote control to change the input if there is no picture or signal to the TV. The TV could have been set to an input that does not have a connected device. Check that the cable or satellite connections are securely plugged into the back of the TV.
Check that the A/C power cord is securely plugged into a wall socket if there is no power to the TV. Test another appliance in the same socket to check that the outlet is working. Inspect the household electrical panel for any tripped breakers or broken/blown fuses. Reset any tripped breakers and replace fuses.
Press the MUTE button on the remote control to deactivate the muting function if the picture is good but there is no sound. Make sure there are no headphones attached to the TV. If you are using a set top box with a volume control, make sure the volume is raised on the box as well.
Press the DISPLAY button on the remote control if the word "Video" is on the screen. This will remove it.
Adjust the Sharpness or Picture Mode if there is snow or picture noise on the screen. Vacuum cleaners, fluorescent lights and other electrical devices can also cause this interference.
Turn the TV on and allow it to sit for a few hours before using if condensation forms inside the unit and the picture is distorted or blurred. Moisture can form inside when there is a sudden change in temperature from cold to warm. This can also happen when the TV has been sitting in the draft of an air conditioner.
Unplug the TV during electrical storms or when not in use for prolonged periods of time.
Do not block any ventilation slots on the TV as this could cause overheating. Do not locate the TV near any heat sources such as furnaces or stoves.