Chosen Solution

Steps:

  1. Press power button.
  2. Red LED lights up and stays in a solid state.
  3. Screen will respond with a completely black screen (no picture, no UI, no graphics).
  4. After 15-20 seconds, TV will automatically power-down.
  5. TV will repeat steps #2-4 for a few cycles.
  6. Unit eventually turns off completely. I tried:
  7. Holding power button (with and without unit plugged in).
  8. Holding power button + volume (with unit plugged in).
  9. Unplugging the unit for hours, days and even weeks.
  10. Using a new power outlet.
  11. Unplugging all communication cables.
  12. Uninstalled back panel and vacuumed/ compressed air all ICs/boards. This issue occurred once before, but a power cycle solved the problem. There had been no degradation or issues with the display itself. I’m looking at the service manual, but nothing seems to fit my problem. What do I do next?

saw this from a different post, from a smaller tv but i guess it couldnt hurt Pull the plug and with the power disconnected hold the power button on for 60 seconds. After at least the 60 seconds plug the tv in and try to start it. If it works great if not , hold the power button in the on position for a count of 20 with the tv plugged in . If theres still no Joy try power with one of your volume buttons at the same time . One of these should provide a hard reset for the tv