Samsung LE37A556P1F Flashing red light

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  • py3m4n
    Senior Member
    • Jul 2011
    • 99
    • Scotland

    #21
    Re: Samsung LE37A556P1F Flashing red light

    I have had a snoop about and it doesn't look like the eeprom is a problem on that series, from what I can glean the eeprom is capable of automatically resetting itself. Looks likes it's only a problem on previous years units.

    Comment

    • TechAMP
      New Member
      • Dec 2011
      • 9

      #22
      Re: Samsung LE37M86BD wont turn the screen!

      Originally posted by retiredcaps
      Hookup a DVD source playing a movie. Plug it into the TV. In dark room, ..
      1) ..can you see the DVD playing without the backlight on? nothing
      Try shining a flashlight on it. didn't help.. Is there sound? Yes

      2) Circled in red are some ICs. What is the part number?
      P2804ND5G, N- & P-Channel Trans.

      3) circled in yellow are SMD fuses. 3A/32V, all are OK
      Is it a good idea if I disconnect all inverter channels by disoldering those 3A fuses, and test only one ch. at a time?

      On PSU board, there is no pulses at " PMW & ADIM". Is that normal. There are no pulses at all on the Inverter board, when the TV is ON!

      I made & noted down som measurements on the boards for your info!
      Attached Files

      Comment

      • TechAMP
        New Member
        • Dec 2011
        • 9

        #23
        Re: Samsung LE37A556P1F Flashing red light

        Originally posted by py3m4n
        My response is to Jasgriff. Why has TechAMP ambushed Jasgriffs thread, lol.
        Sorry. I'm new at this forum. Couldn't fix the problems with the "Making new post, Editing / deleting" wrong messages. I'll try to make a new thread next tim.
        Thank U for your patience.

        Comment

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271

          #24
          Re: Samsung LE37M86BD wont turn the screen!

          Originally posted by TechAMP
          2) Circled in red are some ICs. What is the part number?
          P2804ND5G, N- & P-Channel Trans.
          1) Here is the datasheet for

          http://pdf1.alldatasheet.com/datashe...P2804ND5G.html

          Refer to the diagram for pinouts.

          2) Measure the resistance between S1-G1, S1-D1, D1-G1, S2-G2, S2-D2, D2-G2 for all chips. You can do this in circuit and report all readings. Any reading under 30 ohms suggest the mosfet might be shorted and warrants desoldering and verifying the reading out of circuit.

          3) PS. Since you are getting sound, the power LED on, and a brief flash of backlight, this narrows down the problem to the inverter board.
          --- begin sig file ---

          If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

          We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

          Please do not post inline and offsite as they slow down the loading of pages.

          --- end sig file ---

          Comment

          • Jasgriff
            Badcaps Veteran
            • Feb 2012
            • 578
            • UK

            #25
            Re: Samsung LE37A556P1F Flashing red light

            Forgot to bring home my camera!

            Thought I would list the pins on Connector 3.

            1 P8
            2 N/C
            3 S8
            4 GND
            5 GND
            6 GND
            7 12.5v
            8 12.5v
            9 GND
            10 GND
            11 GND
            12 GND
            13 5.3v
            14 5.3v
            15 5.3v
            16 5.3v
            17 GND
            18 GND
            19 12v
            20 GND
            21 12v
            22 12v
            23 N/C
            24 N/C

            Whats the best way of testing these pins? I have tried to do it on the power board with the cable not connected to the mainboard but i cannot read anything. I assume that the power board knows that the cable is not connected?

            With only Connector 3 connected the mainboard is getting power as I can measure voltage across some of the Ic's I will write my finding down shortly.
            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

              #26
              Re: Samsung LE37A556P1F Flashing red light

              While testing connector 1 with connector 2 and 3 plugged into the mainboard I get the following...

              Adim = 0v
              BL = 0.1v

              "This is in the on state where if connector 1 was hooked up it would give me a completely blank picture.

              With connector 1 and 3 connected I tested connector 2 on the mainboard.

              BLU = 0.1v
              Admin = 0v
              PWM = 3.2v

              Ta for the help with the pins this will help when I am do a little more testing tonight."

              Well per your voltage measurement, you do not have the BL_ON feeding the power supply board which is fed into Connector2 by the main board, and this signal flows into connector 2 right through to connector 1 BL_ON pin which is then sent it out to the inverter board. You should be able to trace out this BL wire from power supply board back the main board connector.
              Last edited by budm; 02-29-2012, 03:29 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

              • Jasgriff
                Badcaps Veteran
                • Feb 2012
                • 578
                • UK

                #27
                Re: Samsung LE37A556P1F Flashing red light

                I have traced BLU back to the mainboard and here is a pic of what it look like and how I tested it.

                GND to BLU = 0.1v
                GND to Point 1 = 0.1v
                GND to Point 2 = 5.2v
                GND to Point 3 = 5.2v
                Attached Files
                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

                  #28
                  Re: Samsung LE37A556P1F Flashing red light

                  Can you please post the picture without the marking so I can see if the trace is connected to the Collector pin ( middle pin the small 3-pin device) through the resistor?
                  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

                  • Jasgriff
                    Badcaps Veteran
                    • Feb 2012
                    • 578
                    • UK

                    #29
                    Re: Samsung LE37A556P1F Flashing red light

                    Originally posted by budm
                    Can you please post the picture without the marking so I can see if the trace is connected to the Collector pin ( middle pin the small 3-pin device) through the resistor?
                    Thanks
                    Sure....
                    Attached Files
                    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

                      #30
                      Re: Samsung LE37A556P1F Flashing red light

                      I actually ordered a second mainboard for this set which turned out to be a slightly different model.

                      It doesnt have the connector or the resistor attached which allows me to test if that pin connects to the collector through the resitor and it definitely does.
                      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

                        #31
                        Re: Samsung LE37A556P1F Flashing red light

                        It does not sound like you order the correct PCB assembly for this model!
                        By the way, I keep getting confuse between your original post and your pictures with the TECHAMP posting on your original post, I wish he will post on the new post instead so I can answering to the right person since they are not the same model, as you can see his main board picture does not have or use that small connector like your new board, but your old board uses/needs that small connector.
                        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

                          #32
                          Re: Samsung LE37A556P1F Flashing red light

                          Hi the original board that came with this TV is still in place.

                          I ordered the second board as sold as seen for £6 knowing that it might not be the right one but I thought it was worth a look. It something I can possibly use for parts or testing my soldering skills / or lack of.

                          I know his posts are confusing. He made a mistake making his first one.

                          So that resistor seems to be dropping 5v over it?

                          Should I not be getting sound regardless of this pin not getting its 5v?
                          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

                            #33
                            Re: Samsung LE37A556P1F Flashing red light

                            OK, please see the attached PDF and verify if that BL_ON is really the BL_ON PIN, also verify the "E" and "B' voltage reading of that transistor. I think the transistor is on right now, it is a Common Emitter connection setup for this transistor.
                            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

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #34
                              Re: Samsung LE37A556P1F Flashing red light

                              You are correct, you should get the sound if you do have the 12vdc power supply section working as you have indicated.
                              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

                                #35
                                Re: Samsung LE37A556P1F Flashing red light

                                1, This end of the resistor connects to the collector of Q6101 - YES
                                2, BL_ON Signal OUT? - Checked again and it definitely that pin the one next to it is ADIM which connects to the second resistor from the left of the next group of 4 resistors.
                                3, Measure B and E - Using the negative probe on E and the positive on B this gives me 0.7V does this mean its connected to ground?
                                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

                                  #36
                                  Re: Samsung LE37A556P1F Flashing red light

                                  Originally posted by budm
                                  You are correct, you should get the sound if you do have the 12vdc power supply section working as you have indicated.
                                  Connector 1 is giving off 12v but I cant check all of the pins on Connector 3. I know that its definitely giving the board power as the optical output lights up and there is power across off of the voltage regulators.
                                  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

                                    #37
                                    Re: Samsung LE37A556P1F Flashing red light

                                    That mean that transistor is being told to turn on by the processor, that is the why the Collect voltage is low and that is why you are getting 0.1v at the BL_LINE.
                                    You can turn that transistor off by connecting a 100 Ohms between the "E" and "B' pins of the transistor, then you should see BL goes high toward 5VDC, if it does not go up, then it may have "E" to "C' shorted out. You can try Ohming out "E" and "C" first if you want.
                                    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

                                      #38
                                      Re: Samsung LE37A556P1F Flashing red light

                                      I connected Connector 2 and 3 then used the multimeter to check continuity between the collector of Q6101 and the BL pin of connector 1 and as you say they do link through.
                                      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

                                        #39
                                        Re: Samsung LE37A556P1F Flashing red light

                                        By the way, since a lot of TV use Common Emitter circuit to drive the BL_ON or PS_ON signal, if you use the 3.3k Ohm resistor connect to 5vdc and PS_ON or BL_ON, you will not be to bring that signal up if the transistor is already on, the transistor will load down the 3.3k resistor, that is why you need to disconnect the cable attached to the main board to manually turn on the P.S, or the Inverter 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

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #40
                                          Re: Samsung LE37A556P1F Flashing red light

                                          Try shorting out that Base and the Emitter with the 100 Ohms and see if the BL is ON.
                                          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

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