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    Samsung 2493 HM issue

    Hi,

    I Just discovered that forum a couple days ago and there seems to be very knowledgeable people and a lots of information here !
    I have a Samsung syncmaster 2493HM which was working fine until a few days ago, then suddenly the backlight started to go dim and a few seconds later, the monitor was black.
    Now, when I turn on the monitor, the blue LED light comes on and stays on solid, never go to sleep (never amber or blinking) and the screen remains blank. Even with a flashlight I don't see any walpaper.
    I looked at some similar post in the forum and didn't find any solution yet. I am very new at this.
    I didn't find any obvious damaged caps, the fuses seems to be good, I checked the 2 voltage regulators on the logic board as per this thread
    https://www.badcaps.net/forum/showth...ghlight=2493hmand I find the same results as Werthles:
    "On the red circled chip i got 5.22, 0, 5.22 on the three pins starting from the top in the image. On the yellow circled chip i got 2.52, 0, 3.31 on the three pins starting from the top in the image."

    Attached are pics from my different boards.
    Can somebody help me please ??
    Attached Files

    #2
    Re: Samsung 2493 HM issue

    I do see 2 Caps that looked bulged.
    On the left side of the power supply there is a connector, I can read that some pin are 24Volts,There should be some pins labeled on/off or p/on and one that is marked dim,and some grounds.
    With a signal going to the monitor what voltages do you read on these pins?
    Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

    Comment


      #3
      Re: Samsung 2493 HM issue

      Hi Alexanna,

      Thanks for your quick reply, on the left hand side connector there are pins labelled +24v, Gnd, SOS, BL, A_DIM.
      Do I have to plug all the cards together to measure these voltages ?

      Comment


        #4
        Re: Samsung 2493 HM issue

        It would be best to have everything connected,Please be careful not to short anything to ground.
        Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

        Comment


          #5
          Re: Samsung 2493 HM issue

          I have:
          +24v:1.2v
          Gnd: 0v
          SOS:0.13v
          BL:0.13v
          Adim:0.06v

          Comment


            #6
            Re: Samsung 2493 HM issue

            Whats the number of th power supply BNxxxxxxx?
            Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

            Comment


              #7
              Re: Samsung 2493 HM issue

              I am working tonight, so I don't have the board in front of me but according to the picture it's BN44-00195A.
              Thank you very much for your time !!!

              Comment


                #8
                Re: Samsung 2493 HM issue

                Apparently this Power supply is also used on the samsung 245BW and 245B...
                http://cgi.ebay.com/Samsung-2493HM-2...-/170619669136

                Comment


                  #9
                  Re: Samsung 2493 HM issue

                  Originally posted by zulururu View Post
                  Apparently this Power supply is also used on the samsung 245BW and 245B...
                  http://cgi.ebay.com/Samsung-2493HM-2...-/170619669136
                  That's what I thought.
                  There are 3 threads open on this P/S now.
                  On the connector going to the logic board, there should be a p/s on and a 5.3v. Pins
                  I don't know for sure if 24v is on that connector but if it is measure it.
                  What voltages do you measure?
                  Do the 2 capacitors near that connector appear domed to you?
                  Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                  Comment


                    #10
                    Re: Samsung 2493 HM issue

                    Should I leave the logic board unplug for the measurement ? I will check that tomorrow and let you know...
                    As I recall the 2 caps top seems flat view from the side.
                    Thanks again !

                    Comment


                      #11
                      Re: Samsung 2493 HM issue

                      Originally posted by zulururu View Post
                      Should I leave the logic board unplug for the measurement ? I will check that tomorrow and let you know...
                      As I recall the 2 caps top seems flat view from the side.
                      Thanks again !
                      Every thing hooked up
                      Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                      Comment


                        #12
                        Re: Samsung 2493 HM issue

                        Here is the measurements I did on the connectors going to the logic board:
                        With the monitor switched ON/Switched Off:

                        24v Det: 0.12v/0.01v
                        pwm dim: 0.06v/0v
                        Brt_ctl:0.06v/0v
                        A_dim:0.13v/0v
                        Bl_en:0.11v/0v

                        NC:0v/0v
                        NC:0v/0v

                        5.3v:0.26v/0v
                        5.3v:0.26v/0v
                        GND:0/0v
                        GND:0/0v
                        GND:0/0v
                        +18v:0v/0v
                        +18v:0v/0v
                        +18v:0/0v
                        GND:0v/0v
                        GND:0v/0v
                        GND:0v/0v
                        +5v Micom: 5.21v/5.21v
                        Power EN:3.22v/0v
                        Attached Files

                        Comment


                          #13
                          Re: Samsung 2493 HM issue

                          The Power EN 3.2V is missing,that is what will request the 5.3V and 24 V. to turn on
                          at this point I am not sure why its missing
                          Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                          Comment


                            #14
                            Re: Samsung 2493 HM issue

                            Hmm... that board really is dead
                            System: HP xw6600 Workstation, 650W PSU | 2x Intel Xeon Quad E5440 @2.83GHz | 8x 1GB FB-DDR2 @ 667MHz | Kingston/Intel X25-M 160GB SSD | 2x 1TB Spinpoint F3, RAID0 | 1x 1TB Spinpoint F3, backup | ATI FireGL V7700 512MB | Sony Optiarc DVD +/-RW | Win 7 Ultimate x64 | 2x Dell UltraSharp U2410f | Dell E248WFP

                            Comment


                              #15
                              Re: Samsung 2493 HM issue

                              Well, I have 3.2v on the Power en when the monitor in turned On, and 0v on the power EN when the monitor is turned off.
                              Maybe my last post is not really clear:
                              Power EN:3.22v/0v means monitor On:3.22v, monitor Off:0v

                              Comment


                                #16
                                Re: Samsung 2493 HM issue

                                Originally posted by zulururu View Post
                                Well, I have 3.2v on the Power en when the monitor in turned On, and 0v on the power EN when the monitor is turned off.
                                Maybe my last post is not really clear:
                                Power EN:3.22v/0v means monitor On:3.22v, monitor Off:0v
                                Thats a good thing,There is another thread tats describes you problem with some more things to test.If you can't find it i will try to add a link

                                https://www.badcaps.net/forum/showthread.php?t=15796
                                Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                                Comment


                                  #17
                                  Re: Samsung 2493 HM issue

                                  Thanks for the link !
                                  I'll try to do some more troubleshooting

                                  Comment


                                    #18
                                    Re: Samsung 2493 HM issue

                                    In the link that alexanna provided, post #6, one of the pins on the connector is labeled S_B. I believe this is the standby voltage. It should read approx. 5V. Are you at least reading that?

                                    Comment


                                      #19
                                      Re: Samsung 2493 HM issue

                                      I could possibaly be wrong, but i think the pin Micom is the standby voltage?
                                      Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                                      Comment


                                        #20
                                        Re: Samsung 2493 HM issue

                                        The input connector labelled Micom is labelled S_B on the output connector of the power supply and yes I have 5.21V on that one

                                        Comment

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