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I have a samsung television model number ws28m64nwxxeu. At first there was a problem with E-W pincushion distortion and then it went dead.I checked the line output transistor and it has a C-E short.Could the line output transformer have caused this problem and are there other components that I might need to change. I cannot get a service manual online for this model. I will need this to get the component numbers, to order them. Thanks; Terry.

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  • cconnorter Nov 10, 2010

    Thank you for your help. I could not get a schematic for this model so I have decided to buy a new set.

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No, the flyback transformer can't cause that. What you experienced was caused by the failure/shorting of one of the modulating diodes - the diodes that are used to control the output of the flyback transformer to compensate for the E-W distortion. When one of the diodes failed it became essentially a short and this has overstressed the transistor till it failed.
This is how the diodes circuit looks in a very similar tv - i don't have your schematic
http://i341.photobucket.com/albums/o368/Azrael-srl/2rm9k3t.jpg
The diodes are from th BY family - usually BY215 or BY218. You will have to identify yourself.

Posted on Nov 07, 2010

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