Understanding why something stopped working has always fascinated me, and now that I'm retired I have more time to do it. I stumbled upon this forum looking for guidance on troubleshooting the power board on my LG OLED TV, which worked again thanks to the replacement of the board as suggested by the service manual, but I will not stop investigating the faulty board. When I was younger a schematic was included with most of the tv set you could buy, but today nobody want to loose time, and the service manual (when you're able to find it) take you to the replacement of a full board. But I'll try...