SOURCE: Samsung LN-S4051d power supply board
The replacement of the power supply is quite easy. You will have to remove the base if applicable and the back cover, once you remove it; you should see the power supply.
Click here to see how the power supply looks like and availability or Click here to find a cheaper one.
I can also repair your power supply. If you need further assistance you can write to [email protected]
SOURCE: Samsung TV Power Supply Board
I doubt that moisture damaged the SMPS bd.
There are many circuit boards in your set and it will take a trained samsung tech to find the problem.
SOURCE: Samsung Power Supply Board
The power supply part number is BN44-00159A. You can also download the info from this link. It's the service manual.
SOURCE: Same "clicking" problem with 46" Samsung LCD...does not turn on.
With any luck you will have the same problem asa the rest of us : blown power board capaciters , remove the rear cover {20 screws} look in the middle of the back of the set with the cover {5 screws} removed from the power supply . Now look to the upper right cornerof the board in the middle of the tv there may be 1 or several capaciters leaking from the X shape on the top , this be be your problem match up replacements but source units that have a higher max voltage than 10volts 7 get them soldered into the board . I repaired mine that failed at 16 months for $4 in parts & it took longer to remove the screws than it did to affect the repair. If you are not conifident about soldering on your $2000 tv then take the board to someone for the job to be done , I would not advise this as a first soldering job , good luck I can't belive how common this is Samsung needs to step up ......
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