Tv just switched itself off,and the power light

The thermistor on the lamp housing has failed, it is used to report the temp of the lamp during operation, The only way to replace it is to remove the optics engine and replace the part. Look for a two wire connector coming from the lamp housing assembly. On this model the thermistor is out of date and needs to be replaced with a newer type. You can jumper the termistor with aligator clips but you risk the unit not shuting down if temp gets to high. I dont recommend u do this but is is an option for you, if no other problems with temp has ever occured before. This will at least let you watch the television normally until the part is replaced. But just because this will work do not you do not need to replace this part ok. Also replace you lamp at this time also..