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Samsung lcd tv 40" model#ln40a450c1d.

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Try changing the aspect ratio to 16:9 if not it could be a burnout.

Posted on May 20, 2011

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Posted on Jan 02, 2017

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What causes a picture to disappear on the TV, but you can still hear the sound?


The sound and the video are produced by 2 seperate boards. One board which provides the sound is directly connected to the speakers. The other board will be the power converter board which controls your graphics. Since there are only 2 boards in a FLAT screen TV it should be the one with 4 to 8 little transformers (a coil of wire) mounted to the board and not connected to the speakers. You can then look up a video board for your model. Should cost $40 to $160. Its all just unscrew the old board and unplug each plug and replace with the new.
Bill

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My samsung ln46c630k1fxza 46 inch t v that has no picture or backlights, i replaced the t-con board, that didnt fix the problem. can you tell me how to fix the problem?


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you need to find the broken contacts on the offending matrix controllr and resolder it. Not for the faint of heart if your soldering skills aren't good!

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Hi my name is Roety,
I can help you with your issue ,
This is most likely a power supply issue
I usually replace the swollen capacitors I can see
A repairman would charge about $300 to replace them for you.
 
 
If I have helped you with your issue
If you have more questions you can still respond
I will reply asap
Thanks

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I had a problem with a Samsung 46 inch LCD and it had audio and dim light but no picture and found out that the logic board toward the top (inside tv) was bad and was no longer available and the only way to fix it was to get the entire display panel (the logic board came with it) It was not costwise to repair. Hope this helps.

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