Not 100% sure but I am currently looking into this. 2 things it might be which are most probable. I replaced my lamp a few years back with no issues. This time around I figured I'd be proactive and bought a new lamp as my current one was going dim. Not unusable but I could tell. Lamp arrived and I put it in. Started up, great! Then after a few minutes it shut down and the red LED would blink 3 times. I removed the lamp and replaced it after unplugging the tv and turned it on. This time it ran about 20 minutes and same thing! Tried a third time and had the same thing. So I put the old bulb back in, and this time it didn't even turn on! I removed it and with a flashlight looked in there. There are two safety switches. The first is a very small pressure switch at the base of where the bulb interfaces to the TV. That switch ensures the bulb housing is seated. Secondly there is a switch in the rear side where the second door with the lever lock is. When you rotate it the switch is engaged. I replaced the housing carefully and made sure everything was tightly seated. The tv has been on for about an hour now no issues with the old bulb.
I have two theories and am leaning toward the second one I will suggest. One is that the bulb is somehow overheating as it is newer and brighter, or is somehow defective. The other theory is that as the bulb heats up the switch might be getting dislodged. I am leaning towards this given that it is working with the old bulb. But I am not certain. Soon I will try the new bulb again and may even attempt to slightly bend the switch out a little so that it is easier to engage.
Just a follow up. I very carefully pulled the tab ever so slightly on the pressure switch towards me so. I replaced the new bulb, ensuring everything was well seated. The TV has been on for over 1/2 hour now with the new bulb...hopefully it sticks! Fingers crossed! I will try to follow up again with this. So if this is the case I would:
1) Remove the housing and inspect the switches. You can try to pull the tab on the one out, but do so ever so gently (you only need a few millimeters) and do so at YOUR OWN RISK!
2) Replace the housing making sure it slides fully in and is fully seated by gently pulling back (not with the ring tab attached but by the sides of the housing) and then push forward.
3) Slide the UV light cover back on and making sure it is tight against the wall when it is fully engaged, turn the locking mechanism fully to the right.
I hope this helps!
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