The TV has safety switches on the lamp door, that has to be actuated before any voltage is applied to the Power Supply and rest of the TV.
So, please double check that.
That is the only "user serviceable" component that would cause this problem.
Sometimes the TV will experience an abnormal/unsafe situation and shut down the TV until the problem has been remedied.
I would suggest reassembling the TV and trying again.
Without having professional training, I would recommend against anything further due to the dangers involved.
I recommend at least having a shop look at the TV, it may only cost $200 to fix, it is better than looking for a new TV.
Please let me know if you need any more information, or a referral to a local TV repair shop
I wish you the best!
Hello Please BE aware This is tech information service. you are paying for the benefit of my real world experience and can save you time and moneyGoing in another direction here if the tv is completely dead acts just like it is unplugged?no lights no clicks?Replace the power supply board at this point the lamp door open or closed is irrelevantthe tv has to respond first should be a standby light as soon as you plug it in and a flashing light when you attempt to turn it on if not replace the power supply BP94-02261A http://www.tvtechparts.com/BP94-02261A-p/bp94-02261a.htm