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

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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