I have noticed my hitachi 50vx500 TV has too much red in people clothes. It can flood out the people. I also noticed when the screen is on a dark scene a large center part of the screen is flooded with a reddish light. I have used Ovation DVD to adjust the color but the reddish light is still there on dark scenes.
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Re: red spot when screen is black
Your light engine will need to be replaced as you have a LCD panel failure. Here is the link to the part number for the model 50V500 if you have the 50V500A it has a different part number. http://www.partstore.com/ProductDetail.aspx?ProductSKU=8286849&ProductType=PART&ModelID=374014
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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.
We had the same problem and the infamous "red cloud" is a light engine defect and Hitachi knows about it. After calling Hitachis Customer Relations Department (not customer service) they referred us to a local Hitachi dealer that diagnosed the problem in less than a minute as a "light engine defect". We called Hitachi back and once they confirmed this with the dealer, they shipped the part to the dealer and the tech came out and installed it...looks like brand new TV. Here's the deal though, when you first call Hitachi, they will act like they've never heard of the problem until you have theTV looked at. They will pay for the part...$1500 but they will ask you to pay the install. Our install was $400...worth it to us on a $3600 TV. Be sure and call the Hitachi customer relations department and not regular customer service...you will get no where with them. The Customer Relations Department # is 800-654-7013. Good Luck!
It is a failure in the light engine itself. You will need to have it replaced. Here is a link to that rather costly part.