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I am seeking a circuit or service manual for a LA40A450C1DXXY

I need a service manual or main PCB Circuit for a Samsung LCD TV Model LA40A450C1DXXY as I am a retired TV & Video Tech trying to fix my sons TV I have been told that the main board (part BN94-02127B)is no longer available in Australia and is not supported by the USA for parts or ic's etc the problem is a vertical red Chroma bar aprox thirty five inches wide from the left side however the tv will work with extra heat sinks and a fan on the main board I have already changed all caps in the PSU inverter etc and am trying to either replace the main PCB or isolate the shorted SMT and replace it but I need a circuit or complete service manual with CRO wave forms etc can you help?

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  • 4 Answers

We tried to turn on tv and it will not show a picture or sound can you tell me what is wrong with it

Posted on Jul 10, 2013


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: sharp lc26sh20u 26"flat panel has vertical lines on left side,What coulb be problem?

This line would either indicate a horizontal problem cropping up or a power supply problem

I would suggest getting a service tech to look at it to determine where your problem is coming from but most likely it will be the power supply /deflection board that is the problem but I can't know for sure, it will have to be checked.

A lot of sets have had damages after a long hot summer a/c flipping off and on and current demand being peeked from the utilities storms or quick power loss off and on can cause problems like this to occur

Please let me know if you have any other questions, thanks

Posted on May 14, 2008

  • 1667 Answers


Your set is servicable with proper troubleshooting. Normaly, the defective boards are swapped out to service these sets. This fault can be in the address decoder, or the display drive boards. It is also possible that the failure is in the display assembly itself.

My preference would be to give the set to the authorised service rep to have an estimate to deterine if the set is worth to service.

Jerry G.

Posted on Jul 16, 2008

  • 21 Answers

SOURCE: NM2168(020731) 14" TV. Vertical circuit

The spark that you saw was probably caused by a cold solder ..remove the old solder,clean the pcb make sure that the track is still ok..if there is a break its ok to jump it with no.22 AWG solid copper wire.Some tv version gets the 24vdc supply for the vertical circuit from the flyback transformer.Also check the vertical IC for cold solders ..hope your problem is confined to cold solders only..good luck

Posted on Dec 30, 2010

  • 4889 Answers

SOURCE: right side of samsung ln52a580p

This is not an issue with the main board . Its a clear case of faulty LCD controller board or the LCD panel itself is faulty(most likely). I suppose the sound is not affected?

Posted on Feb 15, 2011

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