Hi Jaime, welcome, :) try if you are on headphones, try not to drop the menu speakers
I leave you a download of the diagram of your TV so that you can see it and study it, if you have any questions, I will also see it
https://www.yoreparo.com/tv/televisores/lcd/manuales/5837727/haier-l26f6-l32f6-l42f6-sm-diagrama-y-data-eeprom

If you answer I give you my Like of Luck for what solutions but I hope yours;)
I greet you, Tobias
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