Originally Posted by Maveri9720
I do realize there are 3 fans total and I have cleaned the other 2 out. But I have always been able to turn the tv on by only playing with the large 120mm fan. I've watched the other 2 and they turn on with no problems.
My memory served me correct the first time. There are 4 fans total. I'll provide a casual explanation for each.
#1 Lamp hot exhaust (the vertical 120mm which is usually the trouble maker)
#2 Lamp cool intake (positioned horizontally above the plastic air duct, to right of the ballast board)
#3 Cabinet ventilation (smallest one, just to the right of HDMI ports)
#4 OB fan (at bottom of cabinet, buried beneath ASU/DSU assembly)
I'll repeat it again: If even one of these fans is not up to snuff, TV will shut off shortly after power up. There is an RPM sensor in each of them. They are essentially modern PC fans. The TV constantly monitors every one simultaneously, and will not permit service without proper airflow.
How long before auto shutdown after prodding the exhaust fan, will the TV stay on indefinitely?
Temp sensors can go bad as well, either not relaying info at all, or flagging an incorrect high temp reading.