Hello.
I have used an Optoma EX531p projector as a normal television on a 7 foot screen for two years.
Within the last two weeks broken pixel mirrors have appeared showing bright white dots or black dots.
There are hundreds now, at a rate of about 25 a day, emenating from the left hand side.
I know from experience that a semiconductor chip may be weaker in a small area which gradually increases in size.
I am lucky that the DLP projector is guaranteed for 3 years against this type of fault by the distributers.
The projector is fixed upside down near the ceiling, so it never gets knocked, and I also have an uninteruptable power suppy.
As the lamp's lifetime is at least 4000 hours, I would have expected the DLP chip to have lasted at least 20,000 hours.
What lifetime tests have been done, and has anyone else had this situation?
From EE Times Europe Jauary 2012 Page 14 DLP devices are discussed, and they include recognition of biometric, facial, dental, and medical scanning.
Such important systems must not fail, and will be used for many more hours per day than a projector.
I worked at Monotype when Texas Intruments introduced the 74 range of integrated circuits. These IC's developed ramdom faults due to the chip aluminium bonding wires,
and the whole batch had to be replaced by TI. I hope the DLP problem is not a batch one.
I hope to hear from anyone with a similar problem.
Ray Throssell.
Electronic Design Engineer.
