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When was the lamp this model uses for brightness last replaced? These as a rule have a 2,000 hour or 2 year average lifespan and many just before they fail will go darker, picture will come up slower and be a bit dim.
Its time to replace lamp in tv. DLP lamp has limited life span like 3000 working hours and after that it need to be replaced to get bright picture in tv. Lamp replacement is easy and procedure would be written in user manual.
Press and hold the 'FN' key and tap the key that has the picture of a sun and an up arrow (or some other similar picture that dictates brightness - there should be two different keys that affect brightness one to increase and the other to decrease). Once you have the brightness set to your liking quit tapping the 'brightness' key and release the 'fn' key
Yes, if this TV has a bulb it is likely to be the bulb.
I am not familiar with this exact model, but other LCD Projection TV will show dim picture after some time. Expected life of the lamps is about 2yrs. After 2yrs the picture will become dim. After 5yrs I am suprised it is even working.
Dirt doesn't cause this problem unless your are a smoker or have the unit "literally" outside. DO NOT try to clean it or let someone tell you to do it because it will cause more problems than it fixes.