Panasonic TH-42PG9W, TH-37PG9W manual Troubleshooting, Plasma Display panel

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
				Volume
	Normal Picture		No Sound	(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.)
				If a signal with a non-applicable colour system format, or frequency is input, only
	No Picture		Normal Sound	the input terminal indication is displayed.
				Colour controls set at minimum level
	No Colour		Normal Sound	(see page 22, 23)
				Colour system (see page 33)
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
the image is missing appear when I use the zoom				screen wider than one in the 16:9 mode, blank areas separate from the images
function.				are 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 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		The screen will darken slightly when photos, still images of a computer or other pictures with minimal
when bright pictures with minimal		movements are shown for an extended period. This is done to reduce after-image on the screen and
movements are shown.		the shortening of the screen’s service life: It is normal and not indicative of malfunctioning.
It takes a while for the picture		The unit digitally processes the various signals in order to reproduce esthetically pleasing images. As
to appear.		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		Due to the characteristics of the system used to drive the panel, the edges may appear to flicker in
flicker.		the fast-moving parts of the images: This is normal and not indicative of malfunctioning.
The brightness on both sides of		When viewing the side panels at the “High” or “Mid” setting, the brightness on both sides may change
images in the 4:3 mode changes.		depending on the kind of program shown: This is normal and not indicative of malfunctioning.
Some parts of the screen do		The plasma display panel is manufactured using an extremely high level of precision technology,
not light up.		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:
After-images appear		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.

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