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I have read another solution which may indicate the light engine has failed and will likely need replacing. The cost is quite expensive. $1500 range and apparently the part is no longer available from LG. Best you might do is get an estimate to repair just to be sure.
Make sure you reinstall the lamp door as there is a lamp door switch that must be closed or the unit will not fire the lamp, there should be a small hole or opening on lamp door housing. Some people install the lamp without reclosing the door just to see if the unit works , just to find out if it will not work, and when it does;nt think something is wrong, they do not put the lamp door back on first. Not to say this is the case but it does happen.
Some say you can reset the timer in the service menu, normally accessed by holding down the menu button on the TV and the mute button on your remote at the same time. Others say you need a special "service remote" to access the timer. I've changed my bulb twice already and have just learned to ignore the amber lamp timer light. A little square of black electricians tape would make it go away!
I bought a LG 39" flat screen 6 months ago. TV has been working great until this morning. Power comes on for about 5 seconds and then cuts off. Have checked all connections and have unplugged from wall to reset, NOTHING!! And a brand new TV!! Any help would be great!