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Flashes of blue light are fault indications. From the number of flashes occurs at one time switch on, you can get an idea about the faulty section circuit board inside. If you wish to get details about these blinks, check this link.
Are you connected via component cables to a HD cable or satellite box? If so check the RED wire and or connector. It is either loose or has become disconnected.
A discolored Blob, loss of one color or blotchy pattern usually in the center of the screen. The problem is becoming all too common with Hitachi projection sets. What happens is that one of the lenses in the optical block (or light engine) starts to burn or discolor due to overheating because of a blocked air filter causing poor air (cooling) circulation. Nothing can be done when the damage is too far-gone except to replace the light engine-at a cost that makes it not worth repair. if the damage is minimal than to reduce further damage, the air filter should be replaced. The Light engine needs to be removed in order to replace the air filter. Be sure to vote/rate me if this helped Thanks! Also see link: http://fyshere.blogspot.com/search/label/Hitachi%2050V500%2050%20in.%20HDTV-Ready%20LCD%20Television
A green image is usually due to a lack of red or especially blue. the problem is becoming all too common with hitachi lcd projection sets. what happens is that one of the lenses in the optical block (or light engine) starts to burn or discolor due to overheating because of a blocked air filter causing poor air (cooling) circulation. Nothing can be done when the damage is too far gone except to replace the light engine-at acost that makes it not worth repair. if the damage is minimal than to reduce further damage the air filter should be replaced. Light engine needsto be removed in order to replace the air filter.
From your description, it sounds like a problem with the blue color. Green LCD=purple onscreen, Red=cyan(baby blue) onscreen, Blue LCD=yellow onscreen. It could be a lot of dust on the blue lcd panel, or worse, might be a burned polarizer filter behind the lcd panel due to excessive heat. If you can focus on the yellow and its tons of yellow specs, its dust. A burned filter however, must be replaced. A technician trained in projectors will have to do it. The filter material is glued to a thin glass panel and is replaced as a single filter. It's a very involved repair.
How many hours on the lamp timer? If 10,000 or more the lamp is approaching end of life and should be replaced. Lamp will dim when approaching end of life rather than just go out.
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