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are 3 color cathode in your TV red,green,blue cathode.The red and blue cathode
might not working in your set that is why you have a green screen. Open
the back cover of your TV you can immediately see the 3 cathode lamp at
the back. Clean the lamp first using a clean clothe. Power up you tv and see whether the 3 lamps are lit. If lamps do not light up,check the circuit board where this lamp is
connected re-solder all the components in this lamp. There is also an
individual screen adjustment for the lamps it is located at the front
panel and labeled RGB screen...try this first and let me know how it
the light polarizer on the blue lcd panel is fried due to excesive dust and heat, and therefore need to be replaced. unfortunately, zenith may not sell individual parts of the optical engine, so you'll have to replace the whole optical engine.
Go to the Zenith repair site. This has been resolved in a lawsuit. Zenith will fix it free of charge through 7/1/2010. The shop just picked my up to replace the light engine free of charge. Call 1-800-228-1757, have your model number and serial number, and where you purchased it. Here's the neat thing-the question I asked is "have they fixed the problem with the light engine, or is it going to keep going bad?" If happens again (blue lines/spots) before 7/1/2010, they'll replace the TV with a new and different TV of equal value!
throw the set away!the part required to repair the set is the optical engine.Zenith made alot of these sets with defective engine assemblies in wich the lcd filters burn,which cannot be replaced.The labor is also silly.Theunitrequires a complete teardown for replacment.You could buy a very nice new set for the repair bill