Some states have a "right to repair" so check your state then if yours is a right to repair state, call LG and ask for the service manual where this is documented.
Hello, I have an LG 49UB8200. The standby light is on, but when I hit power it blinks 3 times and does not do anything. When I opened the back, on power board (EAY63149401) there is a small light (LD701) that is flashing 5 times, pauses and then repeats. The optical light (sound) on the main board is not on at any point, which makes me think it’s not getting power. Where would you recommend starting on parts for this issue - the power board? Thank you very much for your help.