Originally Posted by KewlK
I was once a regular dispenser of tech advice in this thread. It's been quite awhile since my last log-in.
Felt compelled to share with you a little tip about those 120mm lamp heat exhaust fans: they rarely actually *need* replacement, but rather a little simple maintenance.
All you need is a lint free cloth (coffee filter is fine) and a bottle of *mineral oil* (_do not_ substitute the mineral oil with any other lube no matter how fancy it claims to be).
After removing the fan from your TV remove all excess dust. Now grip the frame of the fan firmly with one hand and grasp the hub (center circle where all the blades meet) with the other. Pull straight and firm. The fan will slide right out of its frame.
Wipe around the metal spline with the lint free cloth. Ensure that no burrs or are felt, if they are, you will need a new fan after all (very rare). Now apply -ONE DROP- and only one drop of mineral oil to the spline. Reinsert the fan into its frame, gently spin it by finger a few times and install assembly back into the TV.
I am still running the original fan in my good old 50XBR1. The lube should last a minimum of three years.
The coil/magnet system in these type of fans put out such little torque, that the slightest drag on the spline/shaft will cause it not to be capable of reaching acceptable RPM. ...Therefore the TV's computer shuts things down as a safety precaution. Mineral oil is an excellent low viscosity lubricant and is the perfect remedy for the problem.
I tried this as described and it still didn't fix my problem. I do agree with you about the incredibly little torque it puts out for the fan to start up. I watched the fan as I turned on the tv and it would move the fan maybe an 1/8th" and then it stopped and the lamp wouldn't come on.
Here's my observations:
When I pulled my old fan and played with it, it had almost a detent feel to it when it came to a stop and the same resistance when you tried to start spinning it. When slowing down it would continue going and when it got close to stopping on it's own, but not quite there yet, it would settle into almost a groove and then rock back and forth minutely and then stop completely. Same when I spin it. Like I had to push it over a tiny hump and then it would spin freely. The resistance isn't much at all, but just enough to not start spinning and cause the lamp not to turn on. And it isn't in one spot b/c I can continue to rotate it slowly and feel that tiny hump each time I spin it, until I go 360 degrees with it. It's not completely free spinning.
So, I thought that was my problem and why I ordered a new one. Except the new one behaves exactly the same way. Neither spin completely freely and just wind down on their own. They get close and then they fall into this little groove and rock back and forth minutely and then stop. I tried popping off the first fan and broke it.
Was able to get the new one off easily and cleaned it, but it was already clean, popped it back on and still the same problem.
I don't want to waste my money buying another new fan, but I don't know what else to do now either. Can anyone confirm if their fan acts the same way or if maybe I just got a bad new fan please?
Any other advice or comments are welcome too.