Mitsubishi Electronics 840 SERIES manual TV Power On/Off Symptom Remarks, Picture Symptom Remarks

Appendices 41

Appendix B: Troubleshooting, continued

TV Power On/Off

	Symptom	Remarks
1.	TV takes an excessively long time to power	When powered on, the TV needs time to boot up, just as a com-
	on.	puter does.
2.	You cannot program the TV to turn on auto-	• The TV may be locked.
	matically (Timer function)	• The clock may not be set.
3.	TV turned itself off and the light on the front	• Momentary power fluctuation can cause the TV to turn off
	panel started to blink.		to prevent damage. Wait for the green light to stop flashing
			and turn the TV on again.
		• If the TV does not stay on, press the POWER button on the
			control panel for ten seconds to perform System Reset. If
			this happens frequently, obtain an AC line power condi-
			tioner/surge protector.
		• An unusual digital signal may have been received, triggering a
			protection circuit. Wait for the light to stop flashing and turn TV
			on.
4.	TV will not power off.	Press the POWER key on the control panel for ten seconds to
		perform System Reset.
Picture
	Symptom	Remarks
1.	Picture does not look like a high-definition	Not all signals are high-definition signals. To receive high-defini-
	picture.	tion programming from your cable or satellite provider, you must
		subscribe to the provider’s high-definition service. Some over-
		the-air broadcasts are in high-definition and can be received with
		a high-quality antenna suited to your location.
2.	TV has sound but no picture.	•	Press MENU on the remote control. If the menu displays,
			then there is a problem with the incoming signal.
		• Check that all video inputs are plugged in firmly.
		• Press and hold the POWER button on the control panel for ten
			seconds to perform System Reset.
3.	Picture has become dimmer.	•	The lamp is nearing the end of its life. Order a new lamp.
		• Adjust picture brightness and contrast to maximum levels.
		• Change Lamp Energy from Standard to Bright.
4.	You cannot view a picture when playing a	Check your VCR’s owner’s guide for further troubleshooting.
	VHS tape.
5.	VCR or DVD player’s on-screen menus jitter	Stop playback. Possible cause: Many VCRs and DVD players
	up and down.	provide on-screen menus at only half-resolution that may
		appear to jitter up and down.
6.	When viewing a stopped VCR, white lines	• Turn off video mute for the VCR.
	are rolling on the screen.	• Begin playing the tape.
		• Change the VCR input from Line 1 to the VCR antenna input.
7.	A color program appears as a black and	840 Series. The PerfectColor color balance has been incorrectly
	white image, or the colors are dim, or the	set. Reset the PerfectColor balance.
	screen is black.
8.	Picture from an HDMI input is noisy (poor	Upgrade a standard (unmarked) HDMI cable to a high-speed
	quality).	HDMI cable.
9.	The image from a computer appears dis-	•	Normal TV operation. The TV does not correct distortion in
	torted when viewed on the TV.		the picture from a computer because the correction process
			may cut off the edges of the image.
		• The aspect ratio may be wrong for the image. Press FORMAT
			to change.

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