Hi Juan, welcome to the forum, how interesting to launch three TVs at the price of one :) I will try to help you, consider that what I know about the teles is what you tell me would have to ensure that it is the main thing that does not work I give you a tip that I always post to determine if it is the main or the source that is not, well, it goes When you connect the TV the source delivers a standby voltage to power the main, when you give the power the main returns the power on level to the source and it delivers the main tensions Three cases 1 - That the source delivers the standby and the main does not return the power on - main malo 2 - That the source does not deliver tension - bad source or short main 3 - That the main return the power on and the source does not deliver the tensions - bad source What is your case? If you answer, I give you my Like of Luck for solutions but I hope for yours;) If you ask a question in the forum, always answer it, the colleagues who answer you spend your time and knowledge with the will to help you, if you are grateful, choose the best answer and give a Like to those who participated. Thank you for collaborating in the forum and Success with your repair