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My TV cuts off after about 20 minutes of use (all 3 lights blink). I can turn it right back on, but then it only lasts for another minute or two. After letting it sit for a while, it will turn back on for another 20 minutes or so. This makes me think there is a heat-related issue. There are no weird noises, and the picture is perfect quality as long as the TV stays on.

I have replaced the temperature sensor, lamp, and ballast... all to no avail. Any other suggestions? I talked to a TV repair tech, and he said it may be the color wheel or power supply. Is this right? Which one should I try first? I tried to look up the part number for my power supply, but I couldn't find it. How can I tell which part is the power supply if that is the culprit?

My TV is Samsung HLS4266W (42" DLP).

Thanks!

The problem I recently encounter sounds very familiar to yours. I have the HL-S4666W so a similar model too. I've replaced everything lamp, ballast, and color wheel. All of which do absolutely nothing for me. I've started to get a really high pitch whining, comes from somewhere near the color wheel but obviously it's not the color wheel. I've bypassed the temp sensor above the lamp to see if that was it, but no luck there either. Seems to be temp related because as you said if i let it sit for a day it will fire up for 10-20 minutes. I get good output from my power supply and haven't seen it vary at all so i'm guessing it's not the power supply.

Hello: would you mind telling me where the temperature sensor is? My HLR4667 picture cuts off frequently, but seems to run much longer when I have the back off with big fan directly on it.