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Panasonic TH37PWD7BKJ Manual

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36
Symptoms
Picture Sound
Before you call for service, determine the symptoms and make a few simple checks as shown below.
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.
Symptoms
The screen darkens slightly when
bright pictures with minimal
movements are shown.
It takes a while for the picture to
appear.
The edges of the images flicker.
The brightness on both sides of
images in the 4:3 mode changes.
Some parts of the screen do not
light up.
After-images appear
[for TH-42PHD7B, TH-50PHD7B]
Whirring sounds can be heard from
the display unit.
Plasma Display panel
Check
The screen will darken slightly when photos, still images of a computer or other pictures with 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.
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.
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.
When viewing the side panels at the “High” or “Mid” setting, the brightness on both sides may change
depending on the kind of program shown: This is normal and not indicative of malfunctioning.
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
4:3 mode.
Note:
The permanent after-image on the Plasma Display resulting from fixed image use is not an 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.
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.
Interference Noisy Sound
Normal Picture No Sound
No Picture No Sound
No Picture Normal Sound
No Coloaur Normal Sound
No remote control operations can be performed.
A cracking sound is sometimes heard from the unit.
The top or bottom of the picture on the screen is cut off
when I use the zoom function.
Areas at the top and bottom of the screen where the image
is missing appear when I use the zoom function.
I can hear sounds coming from inside the unit.
Checks
Electrical Appliances
Cars / Motorcycles
Fluorescent light
Volume
(Check whether the mute function has been activated on the remote control.)
Not plugged into AC outlet
Not switched on
Picture and Brightness/Volume setting
(Check by pressing the power switch or stand-by button on the remote control.)
If a signal with a non-applicable colour system format, or frequency is input, only the
input terminal indication is displayed.
Colour controls set at minimum level
(see page 20, 21)
Colour system (see page 33)
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.)
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.
Adjust the position of the picture on the screen.
When using a video software program (such as a cinema size program) with a screen
wider than one in the 16:9 mode, blank areas separate from the images are formed at
the top and bottom of the screen.
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.
Troubleshooting
… 36 …


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