Samsung LE40A557 no picture at all

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  • Behemot
    Badcaps Legend
    • Dec 2009
    • 4845
    • CZ
    #1

    Samsung LE40A557 no picture at all

    I got this TV, LED is blinking like it is normally turning on but I get no picture, no backlight. Tried also flashlight but I did not see any picture either. Caps are OK, voltages are OK.

    So I went ahead and tried resetting EEPROM per https://www.badcaps.net/forum/showpo...0&postcount=77, but no change. Anything else I can try to check?
    Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Samsung LE40A557 no picture at all

      So you do have PS-ON and the PFC Boosted Voltage of >360VDC on the main filter cap?
      BN44-00199A Power supply/inverter board number?
      Attached Files
      Last edited by budm; 06-09-2015, 11:51 AM.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • Behemot
          Badcaps Legend
          • Dec 2009
          • 4845
          • CZ
          #3
          Re: Samsung LE40A557 no picture at all

          Yep. Signal board is PEARL.
          Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

          Exclusive caps, meters and more!
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            Comment

            • Behemot
              Badcaps Legend
              • Dec 2009
              • 4845
              • CZ
              #4
              Re: Samsung LE40A557 no picture at all

              I must say I somewhat swim in this, it has some special HV output from main board to the inverter board. Than there is second connector for ordinary 12V input…12 V is there, LD is about 10.6 V.
              Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

              Exclusive caps, meters and more!
              Hardware Insights - power supply reviews and more!

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