Panasonic TH-32LRT12U, TH-37LRT12U manual Troubleshooting, LCD Display panel, Symptoms Checks

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Troubleshooting

Before you call for service, determine the symptoms and make a few simple checks as shown below.

 

 

Symptoms

 

Checks

 

 

Picture

 

Sound

 

 

 

 

 

 

 

 

 

Electrical Appliances

 

 

 

 

 

 

 

Interference

 

Noisy Sound

Cars / Motorcycles

 

 

 

 

 

Fluorescent light

 

 

 

 

 

 

 

Normal Picture

 

No Sound

Volume

 

 

 

 

 

 

(Check whether the mute function has been activated on the remote control.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Not plugged into AC outlet

 

 

No Picture

 

No Sound

Not switched on

 

 

 

PICTURE 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 input

 

 

 

terminal indication is displayed.

 

 

 

 

 

 

 

 

 

 

 

 

 

No Color

 

Normal Sound

Color controls set at minimum level. (see page 22)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 a strong fluorescent

 

 

 

 

 

light.

 

 

 

 

 

Check whether the remote control designed specifically for use with the unit is being 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 cabinet undergoing

 

 

 

 

 

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 cut

Adjust the position of the picture on the screen.

 

off when I use the zoom function.

 

 

 

Areas at the top and bottom of the screen where

When using a video software program (such as a cinema size program) with a screen wider

 

the image is missing appear when I use the zoom

than one in the 16:9 mode, blank areas separate from the images are formed at the top and

 

function.

 

bottom of the screen.

 

 

 

 

 

 

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 panel

 

Symptoms

Check

It takes a while for the picture to appear.

The unit digitally processes the various signals in order to reproduce esthetically pleasing

 

 

 

images. As such, it sometimes takes a few moments for the picture to appear when the power

 

 

 

has been turned on, when the input has been switched or when the images for the main picture

 

 

 

and sub picture on the two screens are swapped.

The edges of the images flicker.

Due to the characteristics of the system used to drive the panel, the edges may appear to flicker

 

 

 

in the fast-moving parts of the images: This is normal and not indicative of malfunctioning.

 

 

 

 

The brightness on both sides of images in 4:3 mode

When viewing the side panels at the “BRIGHT” or “MID” setting, the brightness on both sides

changes.

may change depending on the kind of program shown: This is normal and not indicative of

 

 

 

malfunctioning.

There may be red spots, blue spots, green spots and

This is a characteristic of liquid crystal panels and is not a problem. The liquid crystal panel

black spots on the screen.

is built with very high precision technology giving you fine picture details. Occasionally, a few

 

 

 

non-active pixels may appear on the screen as fixed points of red, blue, green, or black.

 

 

 

Please note this does not affect the performance of your LCD.

 

 

 

Image retention may occur. If you display a still picture for an extended period, the image

 

 

 

 

Example

 

might remain on the screen. However, it will disappear after a while. This is not considered

 

 

as malfunction.

 

 

 

 

Image retention appears

 

 

 

 

 

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Contents Operating Instructions Manual de instrucciones English EspañolRisk of Electric Shock Do not Open Important Safety Instructions Table of Contents FCC Statement Trademark CreditsSafety Precautions When using the LCD DisplayTo Prevent the Display From Falling Be sure to disconnect all cables before moving DisplayMaintenance Safety Precautions / MaintenanceSetup AC Power Supply CordAccessories Supplied AccessoriesRemote Control Batteries Page Front side ConnectionsBack side AV connection Component YPbPr connectionConnections Video VCR CamcorderSignal Names for Mini D-sub 15P Connector PC Input Terminals connectionHdmi connection Audio Out connectionSignal names for D-sub 9P connector Serial Terminals connectionCommunication parameters Basic format for control dataPower on / OFF Using the Power SwitchUsing the Power Button Power Indicator GreenInitial selections Selecting the input signalSelecting the On-Screen Menu Language Basic Controls Basic Controls Power Input Menu Mute Return Recall Aspect OFF TimerAspect Controls Anamorphic pictures with a 169 aspect ratioOn-Screen Menu Display On-Screen Menu Display OverviewPicture Menu Sound Menu Select Setup Menu Setup MenuMovie Mode Off / On Setup Menu PC SetupHotel Mode Setup Select Movie ModeHotel Mode Menu List Hotel Mode SetupDetails Troubleshooting Symptoms ChecksSymptoms Check LCD Display panelApplicable Input Signals Specifications Panasonic Professional Flat Panel Display Limited Warranty For the U.S.A and Puerto RicoFor Canada Panasonic Canada IncCustomer Service Customer’s Record Panasonic Professional Display CompanyExecutive Office Panasonic Canada Inc