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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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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.
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How do I fix my Samsung 40 LED TV that has sound but no picture?

Here is what to check when your TV is turned on, power light is ON, but no picture is seen or sound is heard:

1 - Be sure the component you are using (Xbox, Cable, SAT, ROKU) is turned ON.
2 - Check to be sure all cable and cords are securely connected to the TV inputs and component outputs.
3 - Make sure you are on the correct input as some TV's will show a black screen if there is nothing connected to that input.
4 - Unplug the input you are trying to use from the TV (such as an HDMI Cable) and plug it back in.
5 - Check for signs of damage on all cords and cables from the TV to all components.
6 - Make sure the TV is not in ENERGY SAVE MODE, press the button on the remote control to go back to normal mode.
7 - Unplug the TV for 10 minutes to see if there was a temporary one time issue with the TV.
8 - Disconnect the TV from power for 2 minutes, then when plugging it back in PRESS AND HOLD THE POWER BUTTON ON THE TV FOR 10 to 20 SECONDS to try and force the TV to reset.
9 - If after checking all these different issues, you may have a Faulty Power Supply Board, A Bad Capacitor on the Power Supply Board, Loose Wire Harness, or Loose Ribbon Connector in the TV itself.
10 - Most likely when a TV has the power light ON but NO PICTURE and NO SOUND, it is the Power Supply Board that has failed.

BTW, here are solutions for you to play iTunes movies on Samsung smart TV
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My sansung 55 inches LCD tv is showing no picture

Hi,

If you could provide few more details, i would be able to provide more accurate diagnosis :-

1. Model of the TV?
2. How old the TV is?
3. Do you hear any sound?


Thanks and Regards
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Large verticle stripe on the left hand side of a 40 inch Samsung LCD TV. One can still see the picture & hear the sound on the rest of the tv. Stripe changes color periodically-goes from a solid to a...

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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

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771

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Hi - I have some suggestions. The following factors effect picture quality:
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DVD and Sky/Digital TV should look excellent on this TV when connected with a good quality Scart lead (nothing too expensive, but a Oxygen Free Copper Gold lead may help) directly into one of the TV's Scart inputs (avoid using "switching" boxes for multiple equipment).
Also, bear in mind that this is a HUGE screen (40 inches I think) and will REALLY show up bad source material.
The best advice I can give is, if you have HD-ready equipment use HDMI connections for everything (ideally with an HD-uplscaling DVD player which will "improve" the quality of standard DVDs on the TV - I recommend models by Philips) and check that you are in "Movie" or "Cinema" mode on the TV.
Make sure that all of your equipment, like your Sky digibox, is set to 16:9 mode (not 4:3) aswell to preserve the true widescreen aspect ratio.
Hope that helps!
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