I purchased a used non working Zenith D52WLCD recently. I completely dissassembled it, thoroughly and carfully!) removed all the dust and crud, and replaced the bulb and ballast.
It worked! All is well except for two things:
1. There is a yellow tint to the lower third of the screen.
2. The "replace bulb" red light is still on even though the new bulb I put in work fine.
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Re: Yellow Tint on Screen
I would guess that the light engine is not aligned right with the chassis. You will probably have to get into the menus and reset the bulb timer setting to get rid of the replace bulb light. A common problem with these sets is a clogged lint screen causing the set to overheat and shut off after a period of time.
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It comes as a complete chassis assembly only and I have included a link to a website for purchase. The only issue is the cost is almost equal to purchasing a replacement TV. Please take a few moments to rate my response. Thank you..
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!
I just found the solution on another model of Zenith TV. Hold the enter button down on the TV and the MUTE button on the remote. In approx. 5-7 seconds a screen will pop up asking if you want to reset the lamp timer. Hit the bullseye button in the middle of the arrows and it will reset. Worked perfectly.