Chosen Solution
so I repaired this once before. I purchased the power board, the main logic board and the lcd board, the problem was only with one of them, and I can’t remember for the life of me which board actually repaired the issue. I wanna say it was the main logic board, but I could be wrong. These boards are now double in cost of what I paid last time. Any thoughts on which board would have fixed this issue? the Power light will go on, then slowly fade out, then start blinking, I’ve done hard resets and it doesn’t fix it.
Hello, check the output voltages on the power supply, especially the standby 5volt this should be supplied to the main board at all times when the set is plugged into the AC. If it the 5v fades in voltage then the problem is likely a bad filter cap in the 5v standby circuit.
The same thing happened to me. I purchased a Main Board (756TXFCB0QK0030) and replaced it in 2019 and it works fine now.
