Samsung lcd LE32R81B

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  • soul1988
    Member
    • Jan 2013
    • 19
    • portugal

    #1

    Samsung lcd LE32R81B

    Hi everyone,
    I have a 32 samsung lcd tv model ln32r81b and power it on it will blink 5 times red power light then the screen lightup for a second and go off.the power supply the tv has is a BN44-00191A i will post pictures of the power supply and tv.Any help will be appreciated thanks.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Samsung lcd LE32R81B

    Here is the SCH of the BN44-00191A: just fill in the boxes
    http://www.tgohome.com/ServiceManuals/

    Check the PWR_ON/OFF pin, it should have >3V when the TV is turn on
    Same for BL_ON pin.
    Last edited by budm; 03-06-2013, 07:51 PM.
    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

    • soul1988
      Member
      • Jan 2013
      • 19
      • portugal

      #3
      Re: Samsung lcd LE32R81B

      I checked the voltages on the connector that is marked in the image, not sure if this is the right connector to check voltages.

      ON/OFF- 3.65V when I connect the power cable and 2.46V when backlight flashe.

      B/L- 0.004V when I connect the power cable and 5.72V when backlight flashe.

      Comment

      • soul1988
        Member
        • Jan 2013
        • 19
        • portugal

        #4
        Re: Samsung lcd LE32R81B

        I checked the voltages on the 24V rail for backlight and the voltage is 27V is this normal?

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Samsung lcd LE32R81B

          The main key is that the ON/OFF and the BL_ON still stay >3V AFTER the backlights go out? ON/OFF and the BL_ON are generated by the main board.
          Check you batteries of your meter.
          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

          • soul1988
            Member
            • Jan 2013
            • 19
            • portugal

            #6
            Re: Samsung lcd LE32R81B

            The ON/OFF -3.65V and the B/L-5.72, I'm not sure if I'm in the right place to test, I marked the place in the photo that I'm testing. I do not have BL_ON in the board.

            Comment

            • soul1988
              Member
              • Jan 2013
              • 19
              • portugal

              #7
              Re: Samsung lcd LE32R81B

              I tested all capacitors on the board, all are within the expected values and low esr

              Comment

              • soul1988
                Member
                • Jan 2013
                • 19
                • portugal

                #8
                Re: Samsung lcd LE32R81B

                Problem solved, it was the inverter board, a transformer was damaged.

                Comment

                • soul1988
                  Member
                  • Jan 2013
                  • 19
                  • portugal

                  #9
                  Re: Samsung lcd LE32R81B

                  Once again is broken, this time i read 30V on the voltage for the inverter board and should be 24V, the measurement was made with the inverter board disconnected. This means that the problem this time is in powerboard right?

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Samsung lcd LE32R81B

                    Check and replace your multimeter battery. A low battery can lead to erroneously high readings.
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • soul1988
                      Member
                      • Jan 2013
                      • 19
                      • portugal

                      #11
                      Re: Samsung lcd LE32R81B

                      battery is ok.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Samsung lcd LE32R81B

                        What voltage does the 5V standby measure?
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment

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