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I had this same problem. The Zenith rep told me to unplug the TV, hold the power button down for 30 seconds, plug it back in and then turn it on. It worked and I haven't had a problem with it since. I hope this helps. Good Luck!
maybe the original filter was dirty or the background of your tv was dirty and the new filter clean up the background sometimes this types of things happen so im glad that you tv works ok but in further if you need parts you can go to http://www.discount-merchant.com/
I have the same exact TV, with the same problem!
I found out that Zenith has a class action litigation open thru July 2010
Your Optic Light Engine is Defective and Zenith has to replace it for free
Or give you a new 50" Plasma or 44" LCD.
Here is the link with all the details ** http://www.zenithservice.com/index_b2c.jsp
Call the service center and let them know what your problem is and that you know
about the litigation. They will have a tech call you and troubleshoot it over the phone.
Then they will order the Light Engine and have a Tech come to your house and
replace it. It will cost you nothing!!!
Press and HOLD the ENTER (or OK) button on the TV Press and HOLD the MUTE button on the REMOTE
(hold both until the LAMP LIFE HOURS appears on the screen)
Let go of the REMOTE button first, then release the button on the TV
We suggest writing your lamp hours on a peice of masking tape and taping it to the back the TV for future reference.
To reset the lamp counter, press SELECT (or the button in the middle
of the direction arrove buttons). Hit SELECT a second time to confirm
clearing the lamp counter
For certain models, you might have to tweak these steps slightly…offer your inputs!
What is the model number? If its a DLP it could be thermal due to the air filter. If its a CRT projection it could be a bad capacitor that loses tolerance as it warms up. Need the model number to actually be more accurate.