I'm happy to report that I was one of the lucky ones - Samsung fixed my TV for free.
Model Code: HLT4675SX/XAA
Serial number: AHDY3CMP201449A
I'll tell you my story.
On or around 9/5/12, I started a chat conversation w/someone at Samsung. I said, "I'm having the infamous white dots problem on my Samsung TV." The person replied with something like, "There is no such reported issue." I wrote: "Really????" Because it's all over the Internet" and then I copied/pasted a link to this thread as an example." The person replied with something like "I'm sorry, but we are unable to access 3rd party links" and then asked if I was in front of my TV. I said no because I wasn't at home, so then I said I suppose I should try the chat again when I'm at home in front of the TV and the person said yes, so that was the end of the 1st chat.
So, on 9/7/12, I was in front of my TV and started another chat. THIS time, I got someone who understood what the heck I was talking about (partial transcript is below), and followed through with setting up a service call after I provided the information that they needed in order to set up the service call.
Today, I'm VERY HAPPY TO REPORT that the repairman replaced the chip and there are NO MORE WHITE DOTS (I guess some people call it a DLP chip, but in the chat, the representative called it a DMD chip, and the repairman called it a DLP chip - must both be the same thing!!!!
In summary, I guess if you're in the same situation I was, and you have the experience that I had at first (with the rep. that said 'there's no such reported issue') call back and try someone else. I guess some of them are knowledgeable and actually help, and some don't.
THANKS SO MUCH, SAMSUNG!!!
PARTIAL CHAT TRANSCRIPT
Samsung Rep : Hi, thanks for reaching out to Samsung tech support. How can I help you today?
Me: I have a Samsung HL-T5075S,
Me: and I have the infamous "white spots" or "white dots" problem.
Me: I want to find out how this can be fixed.
Me: I've read many things online
Me: and see that this is a common problem and have seen that Samsung knows about it?
Samsung Rep : I understand that you are having an issue with White dots on your TV. Is that correct?
Samsung Rep : Thank you for confirming.
Samsung Rep : I'm sorry to hear that.
Samsung Rep : May I know from when you are experiencing this issue?
Me: i'm not sure i understand the question
Me: are u asking how long i've had the problem?
Samsung Rep : Yes, you are corret.
Samsung Rep : *correct.
Me: a few months - not sure exactly how long...
Samsung Rep : Sorry for the Typo.
Me: started out with a few dots,
Me: and then more and more appearing
Me: so then i decided
Samsung Rep : May I know any external devices connected to your TV?
Me: to try and find out what the dots were,
Me: and searched online
Me: an HD DVR cable box from comcast
Me: and a home theatre system
Samsung Rep : Please press the Menu button on the TV remote and see if the Menu is effected with the same White dots?
Me: well, being that when i press menu, the menu displays 'on top of'
Me: the tv display, i'm not sure what u mean...
Me: i can still see the dots 'through' the menu
Samsung Rep : Thank you for the information.
Me: ur welcome
Samsung Rep : If your unit exhibits white dots appearing on the screen on all sources and channels, Samsung will provide a onetime courtesy repair to replace the DMD chip. However, should the issue not be related to the DMD chip, you will be offered an estimate for repair and be responsible for the trip charge. Do you consent to these conditions?"
Me: yes, i do
Samsung Rep : Thank you for confirming. I will file a service request on behalf of you.
Samsung Rep : Please provide me with the details:
Samsung Rep : Full name:
Samsung Rep : Email address:
Samsung Rep : Phone number:
Samsung Rep : Shipping address with ZIP code:
Samsung Rep : Complete model number:
Samsung Rep : Complete serial number which is 15 digit alpha numeric