TV tech repairman TampaTec Paul shows how to fix a TV not working with black screen no picture no video but has audio and volume sounds OK, follow these service steps and use Television repair tools to get your TV to turn on again with a bright picture.
TV repair parts TV boards and backlight LED strips get them here https://www.shopjimmy.com/tvs/tv-led-... working on LG 42LN5400-UA
part 2 Black TV screen repair-    • TV repair for black screen but has so...  
backlight tester- https://www.shopjimmy.com/tools/
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