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Samsung PN43E450 lost all video & menu while watching. Audio works. Stand-by light works correctly in off & on. No clicking. How do I identify bad board w/o test equip? Thanks, Doug

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Posted on Apr 21, 2017

  • Doug Wickland Apr 22, 2017

    This is a plasma tv; the suggestions sound to me like referencing an LED tv?

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Posted on Jan 02, 2017

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