2-3 months ago a noticed a white small dot on my screen. It gradually increased up to the point that now The whole screen is covered in these dots. It's not only white, but black dots also. But hte black ones are much more difficult to see. The tv is a year and a half old.
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It is the chip that controls the millions of mirrors inside the tv. If they are black, they are stuck closed. If they are white, they are stuck open. I JUST had the same the same thing happen with mine. I bought it 3yr and 2 months ago and I had an extended warranty on it for 3 years. Well, needless to say, it was out of warranty and I was pissed. The store I bought it from suggested I call Samsung. Which, I did. They asked for the model number and told me that my model (hlt5675sx) was one of the ones that is covered becasue they had a problem with the chip. Within 2 weeks, my tv was fixed by a repairman who came to my house. It works perfectly, now and it didn't cost me a penny. Good luck.
Mine started with only one small white dot..... just a week ago, now I have a freakin constellation!!!! (at least 30) . I am gonna call samsung today to see if they will cover this even though it's out of warranty. I believe it to be the micro mirrors
This is a known defect that Samsung should correct at no cost to you whether or not your TV is under warranty. Contact Samsung at their 800-Samsung and tell them you have the 'white dot' problem - advise them that there is an alert on this issue. My TV is over 3 years old and they are taking care of it; just waiting for the part at the moment.
Highly unlikely the bulb could be at fault; it sounds a lot like a defective DLP chip.
If you are not aware of how this device functions, it is an array of physical mirrors which can fail individually and cause the effect you are having.
The bulb failing would cause a loss of the entire screen, not just a few points.
My Samsung was fixed for "free." Call Samsung service 800 number. When asked why you are calling tell them it is about the white dots problem. The tech said he would help me solve the issue and provide me with repair order from a local Electronics dealer. I was given a work order number by the tech and did receive a call from the local repair organization. My DLP is over 36 months old so I asked if this was a "no charge" fix. He assured me that it is. Low and behold I am 100% satisfied with Samsung and the standing behind the product. The fix is a chip replacement that Samsung is well aware of.
Best Educated guess would be your Flyback transformer is failing. Not something you can replace at home and the value of the part may exceed the replacement value of the set by the time labour and part are factored together. DO Not look to replace this part yourself as this part inside the set as it has a high voltage that can be lethal. Output voltage can be around 50,000