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It sounds like the main power supply has a bad capacitor. its a typical issue with a lot of electronic. look on the main power board that the outlet cord comes in to the TV and check all the cylindrical components for swelling, leakage, or singe makes.
It's not the lamp, most of the time they suspected it and the fan gone to malfunction when encountered this kind of symptoms but the fault came from the color wheel. You have to replaced it to resolve the issue.
Red light comes on but then the tv is playing but after about 3 hours it just goes out but I can still hear the sound then if I go back after about 4 to 5 hours if I turn it on it plays no problem. Now the lamp just went. I think before replacing the lamp maybe I should replace cooling fan also.
This tv have a colors wheel is dying and worn out.The sound u hear buzzing,squiling or lound motor noises.The colors wheel require changing,because it dying and spinning off of it motor axis.Hire a tv Tech. to change the colors wheel,because it sit way inside near the Light Projection Engine it self,require take out many machanical parts even can come to the colors wheel itself to change it.
Had similar problem. Thought it was the lamp. Examined old lamp but it appeared to be good. Ordered a new one anyway. Changed the lamp but the TV screen would not come on. It would make the usual noise as it was going to come on normally but it would cycle 3 times & then turn off. The LED lights in the front panel would indicate a defective lamp. Then read about the ballast. Changed the ballast & still same problem. Tried starting the TV without the lamp installed & noticed that the color wheel did not spin. Removed old color wheel & discovered it was broken. This appears to be the cause of all of my problems. I wish I new earlier of the test-turn on the TV without the lamp being installed & check to see if the color wheel is spinning. Would have save money on the lamp & ballast.
Problems with the lamp door detector switch. Try jumping out this switch and running it for a while. The switch is the small switch with the blue rocker arm activated by the tab on the lamp door panel.
The color wheel is the most common problem when it comes to noise from DLP's.
To determine if it is a color wheel or fan:
Turn on the set.
When the noise starts, turn off the set. If the noise goes away within 5 seconds, then the color wheel is bad. If the noise goes away after one to one and a half minutes after the set was shut off, then one of the fans are making the noise.