Purple dots on HD LCD samsung model LNT4661FX/XAA when on.

Do it a third time... Sounds like you've done this before and you have it mastered, so go for it.

Jack

Does it improve when the set warms up? Is it the entire screen or just the left or right side? These sets are notorious for faulty LCD panel tabs which causes blurry/delayed picture problems.

Capacitors are bad on the power supply board, they will probably looked bulged at the top. I've enclosed an example.

http://www.youtube.com/watch?v=Mm51C_RDIZE
-and-
http://www.youtube.com/watch?v=BNHHrgX_6cs

Sounds like the power supply board has failed, VERY common problem. You can call 1-800-samsung for the nearest service center.

Got to Samsung's support site and fill out a request:
http://www.samsung.com/us/support/service/request

You will be contacted by your regional repair center. I'm located in Milwaukee, WI and was contacted by a repair center in Elgin, IL, which is 60 miles away.

The regional center said they think it probably is a electrolytic capacitor issues, as multiple models of Samsung LCD's have this issue. They have defective (too low voltage) capacitors which will eventually give out. Unfortunately he said my model was not on the list they have for a free fix. He gave me the number to Samsung's Executive Customer Relations department, which I then called immediately. The woman there checked and found that my model indeed was covered - she updated the Support Request, and instructed me to call back the regional repair center.

I called back the regional repair center (immediately after finsihing with the ECR) and got a different person on the phone, and gave them my ticket number from my original request. He said since ECR updated it stating my model was covered they would fix it for free. If it's not the capacitors that are causing the problem I will be charged a 150$ fee, plus any parts required to fix the TV. I agreed to that since my local TV repair quoted me 200$ to fix the capacitor issue alone.

Today is January 25th, they have me scheduled to have a repair tech come to my place January 7th to do the repair.

You can fix the capacitors yourself for very cheap, maybe 20-30 bucks if you don't have anything: soldering gun/solder/flux/capacitors/etc...

I'd just go through the service request path, get it fixed for free and have a professional do it. Total time for me was 2 minutes for the service request, 10 minutes on phone for regional repair center, 10 minutes for ECR, 5 minutes for regional again. The repair is expected to take 15 minutes - most likely they'll just swap out the entire power supply board rather than the individual capacitors. Basically 1 hour of time to save minimally 150-250 dollars. I bet not many people asking to fix this make 150 bucks an hour...pretty simple math I think.
-Ryan

This is a known issue with Samsung DLP sets. Here's a link to the solution:

http://forums.cnet.com/5208-13973_102-0.html?messageID=3162774&tag=emfrnd#3162774

no

Thats Samsung for you. They are designed to last just right outside the warranty then fail. Typically the LCD panels are bad, and they are the most expensive part on that Korean unit.

Yes, you do need to get the LCD repair before the warranty expires. Call the manufacturers to find an authorized service center near you.
Good Luck.