Panasonic TH-70LF50U Operating Instructions Manual

Also see for TH-70LF50U: Specification

Contents

Panasonic TH-70LF50U Operating Instructions Manual Manual pdf 54 page image

54TroubleshootingBefore 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 Sound Volume(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 Sound If a signal with a non-applicable color system format, or frequency is input, only the inputterminal indication is displayed.No Color Normal Sound Color controls set at minimum level. (see page 27, 28)COLOR SYSTEM (see page 42)No remote control operations can be performed. Check whether the batteries have discharged completely and, if they have not, whether they wereinserted properly.Check whether the remote control sensor is exposed to an outdoor light or a strong uorescent light.Check whether the remote control designed specically for use with the unit is being used. (The unitcannot 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 cabinet undergoingvery slight contractions in response to changes in the room temperature. There are no adverseeffects 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 a screen widerthan one in the 16:9 mode, blank areas separate from the images are formed at the top andbottom 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 be heard: This isnormal 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 temperaturerises will not pose any problems in terms of performance or quality.Power automatically turns off unexpectedly. Check the settings of “NO SIGNAL POWER OFF”, “PC POWER MANAGEMENT”,“DVI-D POWER MANAGEMENT” and “NO ACTIVITY POWER OFF”. Any of them may beset to “ON (ENABLE)”. (see page 34, 35)There is no picture displayed or sound outputsometimes.When HDMI or DVI signals are input to the Display using a selector or distributor, soundor images may not be output in the normal fashion depending on the selector or distributorused.The symptoms may be improved by turning the power off and on again, or by replacing theselector or distributor.This LCD Display uses special image processing. Hence a slight time lag may occur between image and audio, depending on the type of input signal.However, this is not a malfunction.LCD Display panelSymptoms CheckThe screen darkens slightly when bright pictures withminimal movements 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 picture to appear. The unit digitally processes the various signals in order to reproduce esthetically pleasingimages. As such, it sometimes takes a few moments for the picture to appear when the powerhas been turned on, when the input has been switched.The edges of the images icker. Due to the characteristics of the system used to drive the panel, the edges may appear to ickerin the fast-moving parts of the images: This is normal and not indicative of malfunctioning.There may be red spots, blue spots, green spots andblack spots on the screen.This is a characteristic of liquid crystal panels and is not a problem. The liquid crystal panelis built with very high precision technology giving you ne picture details. Occasionally, a fewnon-active pixels may appear on the screen as xed points of red, blue, green, or black. Pleasenote this does not affect the performance of your LCD.Image retention appearsImage retention may occur. If you display a still picture for an extended period, the imagemight remain on the screen. However, it will disappear after a while. This is not consideredas malfunction.