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The problem is located in video section ( t con board, backlight etc.)
If you deal with electronics repair, on Mr. Jestine Yong blog you can find a lot of articles about this issue (search for tv sound but no picture). If you not deal it, call a service for repair.
Free schematics are hard to come by, I can find the service manual for these sets but it doesn't include schematic diagrams, you can purchase it here and download both them but they cost about 20 bucks each. Another option is contact LG and request the manual, most manufacturs will offer them for free Documents forLG CT 29H32E Service repair manual
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https://www.youtube.com/watch?v=PWoz_-3OHIM
Jan 25, 2013 - Uploaded by Tampatec
Common LG LCD TV REPAIR - NO PICTURE OR BLACK SCREEN FIX ... I have a LG 42PM4700-UB plasma tv that justwent black. The red ... I had to keep turning on and off the TVseveral times for the screen to come back.
? 5:56
https://www.youtube.com/watch?v=xUzCLgoSPGM
Sep 15, 2014 - Uploaded by ShopJimmy.com
LED & LCD TV How to Diagnose Symptom of No Image on theScreen CLICK ... Tv was working fine when left to go to store and came back to blank picture and ... my samsung tv it turns on but its completely black and no sound at all ... LG LCD TV REPAIR - NO PICTURE SCREEN FIX REVIEW - Duration: ...
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