SONY VPL-HW45 (Not staying powered up)

I have a Sony projector (VPL-HW45) that I can’t seem to fix. I’ve had it apart multiple times replacing fans heat sensors etc. It will power up and the fans kick on then it seems to think that it is overheating and shuts off. It does have a red blinking light that sequences to an overheating error. I am at a loss at this point. Any ideas on how to fix it? I dont have a lot of experience with this stuff. I have fixed dvd players, power wheels and swapped components in electronics. My knowledge of boards is basically zero. Any ideas would be appreciated.