Samsung PS50A557S3F

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  • ukvince
    Learning
    • Jun 2011
    • 31

    #1

    Samsung PS50A557S3F

    Been looking at this tv for a friend. It powers up, blue light is steady. and all voltages are present and correct but there's no picture. After much deliberation I knew that the problem must be either the y-sus or buffer or both... I had already checked all of the caps / mossfets etc on the x and y-sus boards but found no issues there but a more in-depth check of the y-sus (LJ92-01549A) found that 3 of the smd diodes are short. These are D5029 / D5030 and D5040. They all have the same markings which are K4 8G, which i believe are rectifier diodes.
    I want to replace these just for the hell of it (before i buy a new board) but I can't find any info on them anywhere so if anyone can help and tell what the specs are for these diodes I would be grateful.

    Here's a pic of the offending items...


    Thanks in advance...
    Attached Files
  • Nick's Tvs
    Badcaps Veteran
    • Jan 2014
    • 621
    • USA

    #2
    Re: Samsung PS50A557S3F

    Check them out of circuit first
    I believe this is what you have but would definitely want a double confirmation on that. This is your K4

    Comment

    • ukvince
      Learning
      • Jun 2011
      • 31

      #3
      Re: Samsung PS50A557S3F

      I checked them out of circuit and they are fine....i get continuity across the pads that they sit on...back to head scratching...
      Last edited by ukvince; 03-17-2016, 05:27 AM.

      Comment

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