Panasonic TH-42LF25ER Operating Instructions Manual

Also see for TH-42LF25ER: Operating instructions

Panasonic TH-42LF25ER Operating Instructions Manual Manual pdf 43 page image

43TroubleshootingBefore you call for service, determine the symptoms and make a few simple checks as shown below.Symptoms ChecksPicture SoundInterference Noisy SoundElectrical AppliancesCars / MotorcyclesFluorescent lightNormal Picture No SoundVolume(Check whether the mute function has been activated on the remote control.)No Picture No SoundNot plugged into AC outletNot switched onPicture and Brightness/Volume setting(Check by pressing the power switch or stand-by button on the remote control.)No Picture Normal SoundIf a signal with a non-applicable colour system format, or frequency is input, onlythe input terminal indication is displayed.No Colour Normal SoundColour controls set at minimum level(see page 24, 25)Colour system (see page 38)No remote control operations can be performed. Check whether the batteries have discharged completely and, if they have not,whether they were inserted properly.Check whether the remote control sensor is exposed to an outdoor light or astrong fluorescent light.Check whether the remote control designed specifically for use with the unit isbeing used. (The unit cannot be operated by any other remote control.)A cracking sound is sometimes heard from the unit. If there is nothing wrong with the picture or sound, this is the sound of the cabinetundergoing very slight contractions in response to changes in the room temperature.There are no adverse effects on the performance or other aspects.The top or bottom of the picture on the screen is cutoff when I use the zoom function.Adjust the position of the picture on the screen.Areas at the top and bottom of the screen wherethe image is missing appear when I use the zoomfunction.When using a video software program (such as a cinema size program) with ascreen wider than one in the 16:9 mode, blank areas separate from the imagesare formed at the top and bottom of the screen.I can hear sounds coming from inside the unit. When the power is turned on, a sound of the display panel being driven may beheard: This is normal and not indicative of malfunctioning.Parts of the unit become hot. Even when the temperature of parts of the front, top and rear panels has risen,these temperature rises will not pose any problems in terms of performance orquality.Power automatically turns off unexpectedly. Check the settings of “Power management”, “No signal power off” and “Noactivity power off” in the Setup menu. Any of them may be set to “On (Enable)”.(see page 31)This LCD Display uses special image processing. Hence a slight time lag may occur between image and audio, depending on the typeof input signal. However, this is not a malfunction.LCD Display panelSymptoms CheckThe screen darkens slightlywhen bright pictures with minimalmovements are shown.The screen will darken slightly when photos, still images of a computer or other pictures with minimalmovements are shown for an extended period. This is done to reduce image retention on the screenand the shortening of the screen’s service life: It is normal and not indicative of malfunctioning.It takes a while for the pictureto appear.The unit digitally processes the various signals in order to reproduce esthetically pleasing images. Assuch, it sometimes takes a few moments for the picture to appear when the power has been turnedon, when the input has been switched.The edges of the images flicker. Due to the characteristics of the system used to drive the panel, the edges may appear to flicker inthe fast-moving parts of the images: This is normal and not indicative of malfunctioning.There may be red spots, bluespots, green spots and blackspots on the screen.This is a characteristic of liquid crystal panels and is not a problem. The liquid crystal panel is builtwith very high precision technology giving you fine picture details. Occasionally, a few non-activepixels may appear on the screen as fixed points of red, blue, green, or black. Please note this doesnot affect the performance of your LCD.Image retention appearsImage retention may occur. If you display a still picture for an extended period, the image might remainon the screen. However, it will disappear after a while. This is not considered as malfunction.