http://www.fixyourdlp.com/blog/2008/03/ ... -problems/
The most popular answers are below
Another customer wrote:I purchased a Samsung DLP HLR5678WX in April of ‘06. About a year later the TV failed to operate and the indicator lights on the front of the tv indicated that the lamp was bad. Luckily I had purchased the extended warranty and only had to wait 5 weeks for my new lamp to arrive, yes I said 5 weeks. I replaced the lamp and the the TV worked great for 2 weeks and then blinking lights on the front of the TV indicating, yet again, a bad lamp. Only waited 3 weeks this time for a new lamp, I complained a little about the first wait. Replaced the lamp for the third time and it worked great for a couple of more weeks and then indicator lights again! I then went in and took a look around and removed the bulb and re-inserted it and the TV worked! It continued to work for a couple of days, indicator lights again. Removed the lamp re-inserted the lamp tightened the screw, the set works. This worked for a couple of months but the last time I tried this it didn’t work. I then called Samsung and arranged for a certified tech to come and check out my set, after all you shouldn’t have to get out a screwdriver everytime you want to watch tv right? The tech showed up and said that he thought it was the ballast so he replaced the ballast and the tv worked great for 3 days but then the same problem.
I am now begining to think that I have 2 spare bulbs and an extra ballast (yes I saved them) and that the problem lies somewhere else. Possibly the switch for the lamp cover? All connectors on the back seem to be in place. Is there a way to test the switch to see if that’s the problem? Any other ideas? Thanks in advance.
I have the exact same problem with a HLR-6178. After replacing what I thought was a bad bulb, the new one worked for a couple months but now I have to remove and re-insert the bulb to get the set to work. It will work fine until the set is turned off, then it will not come back on until you remove and re-insert the lamp again. Very frustrating and no extended warranty. If anyone has a clue as to what the cause or solution is to this problem, I’d love to hear about it.