Chosen Solution
Ok so my Samsung UN40H6203AFXZA tv will not turn on and that red light at the bottom just blinks (5 times). I have changed the power board and main board. Please any ideas will help!!! What about the T CON board?
@jmbucknertx check the fuses on your T-con board. make sure they have continuity. If not replace the fuses. Post some pictures of your T-con board with your question so we can see what you see. Use this guide Adding images to an existing question for that. It is possible that this is your -con board but there is also the possibility that this is caused by bad LED arrays.
frequent lightning in our area ? be sure all services (cable, satellite, phone, electrical, etc.) use the same ground rod at your place - that will help keep it to a minimum
