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Samsung LE40B530P7W - NO POWER - BN44-00264C Rev 1.4 fault find

Discussion in 'Sensors and Actuators' started by eddie1759, Jan 12, 2022.

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  1. eddie1759

    eddie1759

    3
    0
    Jan 12, 2022
    Hello, I just joined as I am looking for assistance and step by step guidance on how to fault find damaged components on BN44-00264C Rev 1.4 power board. Visual inspection has highlighted a burnt mark on the board to one side of item BM802. I am looking into replacing the damaged components if possible, otherwise would like confirmation if I need to replace the complete PCB, thank you in advance. Please refer to attached photo with the damaged component highlighted with yellow.
     

    Attached Files:

  2. bertus

    bertus Moderator

    2,266
    841
    Nov 8, 2019
    Hello,

    Can you post a close-up of that area?
    Also a picture of the back of that area would help.

    Bertus
     
  3. eddie1759

    eddie1759

    3
    0
    Jan 12, 2022
    Hello Bertus

    Thank you for the contact and reply, as requested please see attached.
     

    Attached Files:

  4. bertus

    bertus Moderator

    2,266
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    Nov 8, 2019
  5. eddie1759

    eddie1759

    3
    0
    Jan 12, 2022
    Hello Bertus,
    I have replaced the blue part, CM806 and also the ceramic fuse, T3.15AH250V. When connected and switched on, the fuse blow up, and when I checked the replacement fuse it was T3.15A600V. Do you think it is the wrong fuse or other components have fault? Thank you very much.
     
  6. bertus

    bertus Moderator

    2,266
    841
    Nov 8, 2019
    Hello,

    It sound as if there are still parts that create shorts.
    It can be that some mosfets in the SMPS are bad.
    Unfortunately the service manual does not have any schematics.
    As for power checks it has the attached pages.

    Bertus
     
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