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It is most likly an optical problem with dust or a haze onthe optics or a bulb problem or could be a bad LCD display. If I were youand if you are handy, get a service manual, look at how to disassemble theoptics and light housing, and clean everything first, but NEVER ever sprayanything onto the optics and use just a slightly damped soft cloth, never anypaper product. Or the way the pros recommend is with compressed air, butif it is canned air, be careful, as those things get cold and you can easilydamage something. In a good camera storethey will have a bulb type blower to clean lenses off .
If your problem is with the light engine Hitachi has extended the warranty of theengines out to 3 years. You'll need to contact an authorized Hitachi service center tohave this fixed at no charge.
I have the same tv and the same problem, but my yellow is a cloud around the outside of the screen. My tv was recently moved, and a repair shop told me that sometimes in a move these tvs light engine takes a shock and causes a yellow "band" on the screen. I am hearing that these light engines are not cheap either. Hope this helps you.
Took the TV to the shop...there I learned that the obtical engine assambly has been a pain on this type of TV. The repairer suggested on calling the company and to compliant about it, since there seems to be a known problem with that assambly. The company will send the part ($900.00 cost) to the shop and all I have to pay is for the remove and instalation of the assambly.
Here is what you need to do...just went through this. Call the Hitachi customer relations department at 800-654-7013. Tell them what the TV is doing and that you have a defective light engine. They will act like they have no idea what you're talking about but will give you some names to some certified dealers in your area. Have a tech come out and once they diagnois the problem, call the customer relations department with Hitachi back and all of a sudden, they will be aware of the problem and will call the dealer directly to confirm that it's the light engine. Once they confirm it with the dealer, they will send a new light engine directly to the dealer at their expense (part cost them around $1500). The dealer will call you to set up a date/time to come out and install it. Our install was $400..worth it to us because we paid $3600 for the 60" set 3 years ago. Once our light engine was replaced,the TV is like brand new.
Please deal only with Hitachi's customer realtions department at the number listed above. Their regular customer service will have you chasing your tail. Also, DO NOT let any dealer tell you that you have to pay for this part once it comes in. Hitachi is replacing it for free..all you pay in for the install. Good Luck!