Chosen Solution
LG 39lb580v the standby light will flash 3 times and tv wont turn on, before this it had no pictures but sound. I have checked the capacitors etc and visually all seem fine. Is it likely power board fault or main board. Update (10/02/2019)
@matyh72 that is usually backlight related. you need to measure the voltages from your power board to the main board as well as a the voltages on your LED connector. Let us know what those voltages are. Post some good pictures of your boards and cable sso we can see what you see. Adding images to an existing question
Hi @matyh72 , please find the answer in this topic, there is also chat with an LG support.
3 Time led blinking standby
