From the information you have provided I expect the problem is being caused by a defective optical block, also called a light engine. Click here to view the pricing of the part. I cannot reccomend this as a part a consumer should replace due to the difficulty. Most TV repair shops will charge about $1000 t replace the light engine and make the needed adjustments.
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No, sorry to say the optical block is causing the problem. This is a very common part to fail on the DLP TV sets. Click here to see what other customers are saying. . I sure wish I had better news for you. Many manifactures are no longer producing DLP TV sets due to the problems with the light engines.