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A DLP Lamp will fail in two ways. 1.The glass tube housing the filament will shatter and the TV will not turn on. 2. The lamp has many hours of use on it and will gradually grow dimmer. At no time will the lamp cause any picture defect. Check your Cable or Sat box for the correct aspect ratio as well as the TV aspect ratio. Chances are the aspect ratio in either system is set incorrectly. If the gray borders are uniform then the aspect ratio is not set properly. If this occurs on certain channels but not others then the particular channel is broadcasting in the 4:3 aspect ratio and there is nothing wrong with your set.
It seems you might have an issue with the dmd board.
Go to the menu, and if the dots still show on the menu, the issue definitely is with the dmd board but if they don't come up on the menu, the issue will be with the video board.
It could be the temp sensor going bad. This sensor sits on top of the
metal housing which the bulb assembly slides into. The bulb assembly
will have a hole on top and this is where the sensor is above. There is a
small blue and white wire that plugs into it. If you pull the wire out
and put a paper clip or wire in the coupling you will basically bypass
the sensor connecting the blue and white wire. If your tv turns on then
that is your problem. Its cheap too. Here were my symptoms..1] Turn tv
on 2] Bulb would light up..(which eliminates the ballast) regular
picture would show up (which eliminates the bulb and color wheel) 3] 30
seconds later tv would shut down with 3 flashing lights. After bypass
the tv turned on as always and hasnt shut down yet. Always un plug tv
first. Get the replacement part to avoid overheating and possible fire
I had the same exact problem.
I removed the bulb and cleaned it. There is a small screen at the top of the bulb and it was covered with dust. Once it was cleaned I replaced the bulb and it solved the problem.
Thanks to those who posted the solutions