LG 47LN5750 47" LED TV 1920x1080, 120 Hz, HDTV Logo
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Jim Knabb Posted on Sep 04, 2015
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Fix lg led tv with no picture but has sound

Have sound but no picture

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The Knight

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  • LG Master 76,851 Answers
  • Posted on Sep 05, 2015
The Knight
LG Master
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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/
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.

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This is a LED TV so there won't be an inverter board, they're only on LCD sets, what is wrong with your set is you have shorted LED lamps in the panel, its a common issue with this model TV, Ive replaced dozens of them in the last couple yrs, its not a fun job to do as the panel can be damaged very easily if extreme care isn't taken when handling it, watch some youtube vids to get an idea of how to do it...Good luck!!
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