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Power light blink 2 times

My Samsung tv won't turn on, the power led blink twice, I did open the tv and notice the following

  1. The back light does go full, dim then off. If I keep the power on, it keep going on the same cycle
  2. If I disconnect the main board, the backlight stays full the entire time.
  3. Did replace the main board, and the behavior is still the same.

I do have access to multimeter, any ideas what to do next?

Btw, model number is UN55RU730DF

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Update

When I do disconnect any one one of wide cable that comes from main board to screen panel, I can hear sound and use remote, no image/video

Thanks

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try this post

https://appuals.com/samsung-tv-standby-l...

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Hilal Al Harthi sarà eternamente grato.
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