My tv will turn of then click right back off it won't stay on it's a 55 inch Emmerson

https://www.youtube.com/watch?v=O7BRtOwNS2s

check this forum out.https://www.justanswer.com/tv-repair/2l9s1-hitachi-55-inch-projection-tv-won-t-turn-makes.html

Hi i would need more info. what is the model number. its not always the power board it can be a processor fault. and thats the main av board. the processor is what turns on all the parts to start up.

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary..

Are any of the buttons physically stuck? Can you feel them all click.

If it is turning off by itself then your power supply might be going out. If it does not bother you too much right now I would wait until it gets worst. Depending on how much you use it it may not get worst in months.

You can get parts at www.interliquidparts.com

IF its the lamp for Lcd. Hi,it sounds like your lamp is going bad,its symptoms are : will shut off and on,led indicators.The lamp on your set last 6000-8000 hrs 2--3 yrs and its made by Philips .Part # is xl-2200 found it here: http://www.discount-merchant.com/SearchResults.asp?Search=XL2200+?Click=48173 God bless you!

This is a common problem with this TV set. You can get the parts, chips, and instructions to fix it your self from www.TvRepairKits.com

looks like voltage reg.in the power supply need replace.