Sony XBR55X800H White blink once but no boot screen (black screen)

I used factory reset process:

  • Unplugging power supply
  • Waiting 30 second
  • Keep Power on button press
  • Plugging power supply (keep button pressed)
  • Waiting around 45 second
  • White led blinking once
  • No boot screen visible (black screen)

Any idea of the symptoms? Thanks!

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