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Ballast Lamp provide back light in DLP TV and if its bad / broken TV wont power up. If lamp is weak, dark or less bright picture will come in screen.
Color wheel is responsible for colors in picture and if its broke, TV wont power up and common problem with color wheel is high pitch noise while it spins.
Looks like we all got screwed with this TV. Mine just started after 2 years and now it's getting louder. I think I rather call my lawyer than Tech. This product is NOT build properly and someone should let the company know about it.
i have a 56DR650 and it does them same thing. It is still under warranty but where i bought it, they said they can no longer fix it so they are giving my money back. the problem has to do with the color wheel inside.