Samsung LE37A556P1F Flashing red light

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  • Jasgriff
    Badcaps Veteran
    • Feb 2012
    • 578
    • UK

    #41
    Re: Samsung LE37A556P1F Flashing red light

    I haven't got any loose resistors here that the moment to try it out I will have to pick some up tomorrow.

    Is there anything else I should pick up while i'm at it?
    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

    How to resize your pictures guide click HERE
    Retiredcaps Ideal post example click HERE

    Comment

    • Jasgriff
      Badcaps Veteran
      • Feb 2012
      • 578
      • UK

      #42
      Re: Samsung LE37A556P1F Flashing red light

      Also when Connector 2 is not connected to the mainboard the backlight comes on really bright so how can it do that with no BL_ON signal connected?
      Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

      How to resize your pictures guide click HERE
      Retiredcaps Ideal post example click HERE

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #43
        Re: Samsung LE37A556P1F Flashing red light

        What you can do is to set your meter to DC AMP mode (you know how to do that right) and just connect the probes of the meter to the E and B, that should do it also.
        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

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #44
          Re: Samsung LE37A556P1F Flashing red light

          The inverter may have Pulled up resistor on it already.
          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

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #45
            Re: Samsung LE37A556P1F Flashing red light

            At this point, we want to verify that the transistor is being told to turn on, it should goes off when the TV is turn on, so it sounds like you have main board problem.
            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

            • Jasgriff
              Badcaps Veteran
              • Feb 2012
              • 578
              • UK

              #46
              Re: Samsung LE37A556P1F Flashing red light

              Originally posted by budm
              What you can do is to set your meter to DC AMP mode (you know how to do that right) and just connect the probes of the meter to the E and B, that should do it also.
              There is a pic of my meter at the beginning of this post I am guessing that the dial need to be at point to the very bottom with the probes in the same place as if i were measuring diodes?
              Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

              How to resize your pictures guide click HERE
              Retiredcaps Ideal post example click HERE

              Comment

              • Jasgriff
                Badcaps Veteran
                • Feb 2012
                • 578
                • UK

                #47
                Re: Samsung LE37A556P1F Flashing red light

                Originally posted by budm
                Try shorting out that Base and the Emitter with the 100 Ohms and see if the BL is ON.
                Ok I did that with the multimeter and the back light turned on.
                Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                How to resize your pictures guide click HERE
                Retiredcaps Ideal post example click HERE

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #48
                  Re: Samsung LE37A556P1F Flashing red light

                  Well, that main board is not working as far as the BL ON signal, second thing will be that you can now turn on the backlights for the light source, then you should see the pictures on the screen, if not, then you have more problems on the main board beside no BL ON signals. Power supply section on the main board will have to be checked next since it has a bunch of voltage regulators on the main board.
                  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

                  • Jasgriff
                    Badcaps Veteran
                    • Feb 2012
                    • 578
                    • UK

                    #49
                    Re: Samsung LE37A556P1F Flashing red light

                    Originally posted by budm
                    Well, that main board is not working as far as the BL ON signal, second thing will be that you can now turn on the backlights for the light source, then you should see the pictures on the screen, if not, then you have more problems on the main board beside no BL ON signals. Power supply section on the main board will have to be checked next since it has a bunch of voltage regulators on the main board.
                    Backlight comes on but the screen has not picture at all.

                    I can see about 5 voltage regulators on this board. Do you want the readings from all of these along with their model numbers or should they all be the same?
                    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                    How to resize your pictures guide click HERE
                    Retiredcaps Ideal post example click HERE

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #50
                      Re: Samsung LE37A556P1F Flashing red light

                      They will not be all the same, there should be some kind of marking on those regulators, we need the numbers so we can look up the spec for them.
                      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

                      • Jasgriff
                        Badcaps Veteran
                        • Feb 2012
                        • 578
                        • UK

                        #51
                        Re: Samsung LE37A556P1F Flashing red light

                        Ok

                        CH? 17-33 0818BG
                        CH? 17-18 0814BG
                        ch? 1117 0819BG x 2
                        17-25 0807AG
                        KIA 78D015F

                        Those are the ones I can see on the main board.
                        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                        How to resize your pictures guide click HERE
                        Retiredcaps Ideal post example click HERE

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #52
                          Re: Samsung LE37A556P1F Flashing red light

                          CH? 17-33 0818BG: More likely to be the same as LM1117 3.3V FIXED Regulator
                          CH? 17-18 0814BG: More likely to be the same as LM1117 1.8V FIXED Regulator
                          ch? 1117 0819BG x 2: More likely to be the same as LM1117 Variable Regulator, the voltage will set by two resistor on one of the PIN.
                          17-25 0807AG: More likely to be the same as LM1117 2.5V FIXED Regulator
                          KIA 78D015F: More likely to be the same as LM7805 low drop out type 15V FIXED Regulator

                          So just look up the datasheet for them.
                          Attached Files
                          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

                          • Scenic
                            o.O
                            • Sep 2007
                            • 2640
                            • Germany

                            #53
                            Re: Samsung LE37A556P1F Flashing red light

                            Originally posted by budm
                            KIA 78D015F: More likely to be the same as LM7805 low drop out type 15V FIXED Regulator
                            KIA78D015F is a 1.5V voltage regulator. Not 15V.
                            Attached Files

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #54
                              Re: Samsung LE37A556P1F Flashing red light

                              scenic, thanks for finding the spec sheet, I should have seen the 0 (ZERO) in front of the 15, which makes sense, thanks.
                              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

                              • Scenic
                                o.O
                                • Sep 2007
                                • 2640
                                • Germany

                                #55
                                Re: Samsung LE37A556P1F Flashing red light

                                No prob. It's a weirdo VR though.. Apparently it's a "standard" 78xx series voltage regulator, but with a completely oddball 1.5V output voltage.
                                (the lowest the actual standard/jellybean 78xx's go to is 5V)

                                I thought it was 15V too.. but that voltage seemed really odd for a LCD TV mainboard.. so I went digging a bit
                                Last edited by Scenic; 02-29-2012, 10:38 PM.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #56
                                  Re: Samsung LE37A556P1F Flashing red light

                                  I still do not know which IC will be using 1.5v for VCC, the cpu will more likely to use the 1.8v. But we will find out if he can find what went out on the main board.
                                  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

                                  • Jasgriff
                                    Badcaps Veteran
                                    • Feb 2012
                                    • 578
                                    • UK

                                    #57
                                    Re: Samsung LE37A556P1F Flashing red light

                                    Ok thats all of the readings from the voltage regulators listed.

                                    All seem to be performing ok.

                                    Not sure how to test what the variable regulators should actually be outputting though?
                                    Attached Files
                                    Last edited by Jasgriff; 03-01-2012, 02:15 AM.
                                    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                    How to resize your pictures guide click HERE
                                    Retiredcaps Ideal post example click HERE

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #58
                                      Re: Samsung LE37A556P1F Flashing red light

                                      The one with the adjustable output using the resistors at the adjustable pin, there is a note in the spec sheet on how to set the out put voltage by calculating the value of the two resistors. You will have to Ohm out the two resistor and see if you put those value into the formula to see what it should have at the output.
                                      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

                                      • Jasgriff
                                        Badcaps Veteran
                                        • Feb 2012
                                        • 578
                                        • UK

                                        #59
                                        Re: Samsung LE37A556P1F Flashing red light

                                        Originally posted by budm
                                        The one with the adjustable output using the resistors at the adjustable pin, there is a note in the spec sheet on how to set the out put voltage by calculating the value of the two resistors. You will have to Ohm out the two resistor and see if you put those value into the formula to see what it should have at the output.
                                        Ok I have tested the first set and these are the results and my calculations do they seem correct?

                                        The second set of readings are attached and they seem to be alot closer to what I would be expecting to find.
                                        Attached Files
                                        Last edited by Jasgriff; 03-01-2012, 03:30 PM.
                                        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                        How to resize your pictures guide click HERE
                                        Retiredcaps Ideal post example click HERE

                                        Comment

                                        • Jasgriff
                                          Badcaps Veteran
                                          • Feb 2012
                                          • 578
                                          • UK

                                          #60
                                          Re: Samsung LE37A556P1F Flashing red light

                                          Just realised that there are more regulators on the underside of the board

                                          There are another 3 which will be quite difficult to test without taking off off both boards and setting them up away from the tv?
                                          Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                          How to resize your pictures guide click HERE
                                          Retiredcaps Ideal post example click HERE

                                          Comment

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