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 24, 25)

 

 

 

 

 

 

COLOR 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 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.

 

 

 

 

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 is

 

 

 

 

 

normal and not indicative of malfunctioning.

This Plasma 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.

Plasma Display panel

 

Symptoms

Check

The screen darkens slightly when bright pictures with

The screen will darken slightly when photos, still images of a computer or other pictures with

minimal movements are shown.

minimal movements are shown for an extended period. This is done to reduce after-image

 

 

 

on the screen and 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 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 NORMAL

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

mode changes.

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

 

 

 

malfunctioning.

Some parts of the screen do not light up.

The plasma display panel is manufactured using an extremely high level of precision technology,

 

 

 

however, sometimes some parts of the screen may be missing picture elements or have luminous

 

 

 

spots. This is not a malfunction.

 

 

 

Do not allow a still picture to be displayed for an extended period, as this can cause a permanent

 

 

 

after-image to remain on the Plasma Display.

 

 

 

Examples of still pictures include logos, video games, computer images, teletext and images

 

 

 

displayed in NORMAL mode.

 

 

 

Note:

 

 

 

The permanent after-image on the Plasma Display resulting from fixed image use is not an

 

 

 

 

After-images appear

operating defect and as such is not covered by the Warranty.

 

 

 

This product is not designed to display fixed images for extended periods of time.

Whirring sounds can be heard from the display unit.

The display unit is fitted with a cooling fan to dissipate heat generated during normal use. The

 

 

 

whirring sound is caused by rotation of the fan and is not a malfunction.

 

 

 

 

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Panasonic TH-50PF9UK operating instructions Troubleshooting, Plasma Display panel