2. The second issue is rougher. That is a good tech would dust it out AFTER changing the DMD. WHY? Because dust in the light engine is nearly impossible to clean up from.
If it still turns off you start replacing boards and fans. However if the client has it in some enclosed space a discuss is had.
My tv, samsung 72" DLP, Model # 72A650C1FXZA has 1000 white dots and an orange screen. Oh, also occasionally it turns off by its self. What is the diagnosis for these problems??