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Your DMD (Digital Micromirror Device) is failing, It roughly has 900,000 mirrors on the chip that move away or towards the light for shading. You may be able to find this board through Shop Jimmy or by simply googling dmd board for your model#
Your part# for the mirror is BP67-00096A. Samsung has them new for $198.73 plus shipping. You might be able to find it cheaper if you google it or know someone that has the same model set that does not work.
It sounds like the mirror array is playing up. Maybe caused, as it is mechanical, by dust. If it is still under warranty, I would have it looked at, if not request a Samsung Authorised DLP Technician takes a look for you. If you are in Europe Samsung may look at it with a view to helping when it comes to repair cost. Good luck
You get white spots inside the samsung DLP tv due to bad Digital Micromiror Device , or bad DMD board .
What is actually the problem is the DMV chip connected to this board . Inside this chip are 3 million tiny mirrors ,and when they physically get stuck , they either show black or white instead of a color
This is well know problem with SAMSUNG DLP...
The DMD chip is failing.If not under warranty expect to pay a few hundred to several hundred to get it fixed
The mirrors on the DLP chip are slowly sticking either fully open (white) or fully closed (black). The part that contains the DLP chip is the Light Engine. It is the most expensive part of the TV.Only the Samsung TVs has this issue.
Replacing the DLP chip and the micro mirror would solve this issue...