I'm not very knowledgeable about electronics, by far. Just a person trying to save a few dollars. So just out of the blue my 10 year old LG 32" flat screen won't power on, and no stand-by light is present on the front. The only sign of life (or power) is a little green LED on the main board. So I ordered another board for $20 and not only did it not fix it but the little green LED doesn't light up either. I'm about to order a power supply board but I'm curious about the little LED. What does it indicate and why would it light up on one and not the other, and if it is a trouble shooting light that only comes on when theres a problem why would it not fix the TV now that it isn't on? I don't want to buy another power supply with two main boards doing two different things.