If this happens to you, you might want to stress to Samsung support that the three lights indicate a failed lamp. My tech guy told me that Samsung has to send the lamp to them because they do not stock such things. Make sure the lamp's in the mail or else you might be wasting valuable time.
I told the serviceman on the phone that it's a lamp because
1. it has 3 blinking lights
2. there's no light/illumination on the back of tv.
I asked him if he could order the lamp from Samsung. He insisted that he needed to look at TV first. I asked him if I had to wait another 3-4 weeks for the order after his "conclusion". He said, "not neccessarily". That's all. I can bet that it will be another 3-4 weeks.
Oh, when the tech came, he started to remove some random screws all over the unit -- I had to point to him the location of the access door.
After he replaced the lamp, he tried to turn the unit on without closing the lamp door. Again, I had to help him out.
This is what I am afraid of. All the stories I read here the servicemen don't know a $hit about what they doing. I am also afraid that he might touch the lamp with bare hands.
Someone suggested me to call Samsung direct in another thread (I used their website to locate repair shop). I called and their automated voice-mail system guided me to the same address/phone. I didn't have a chance to speak to customer rep directly.