Samsung 2493 HM issue

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  • alexanna
    Member
    • Mar 2010
    • 1346

    #61
    Re: Samsung 2493 HM issue

    Originally posted by zulururu
    Is it a question for me ?? if yes, my DMM doesn't have a capacitor range .....sorry !
    Not exactly, I got the threads mixed up.
    I am not really sure where you are on you monitor, I guess the point I was trying to make was there have been several failures of that capacitor. It sure wouldn't hurt to check the capacitance of it, and if the equipment on hand is unable to test it, I tried to give several suggestions on how to get it tested without spending a lot of money.
    Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

    Comment

    • zulururu
      Member
      • Aug 2011
      • 43

      #62
      Re: Samsung 2493 HM issue

      Ah ok Thanks Alexanna !
      I ordered an SMPS controller on August 19th apparently, it's coming from Australia and I still did not receive it, so as soon as I install it, I will let you know if that worked, if not, I will try to check that capacitor !
      Thanks for the heads up though !
      Cheers,

      Comment

      • zulururu
        Member
        • Aug 2011
        • 43

        #63
        Re: Samsung 2493 HM issue

        After more than a month, I've finally received my SMPS controller ... but after installation, unfortunately, my monitor is still not working .... I still don't have 5.3v or 24v ....
        Do you have anymore suggestion ?

        Comment

        • PlainBill
          Badcaps Legend
          • Feb 2009
          • 7034
          • USA

          #64
          Re: Samsung 2493 HM issue

          Originally posted by zulururu
          After more than a month, I've finally received my SMPS controller ... but after installation, unfortunately, my monitor is still not working .... I still don't have 5.3v or 24v ....
          Do you have anymore suggestion ?
          Darn!!! I had temporary access to another BN44-00195A and made some measurements with the supply operating. Here is the comparison. As you can see, they are very similar. Unfortunately, I did not make measurements on other points on the board, and no longer have access to that supply.

          Pin Yours Other one
          1: 5.05v / 5.08V
          2: 5.05v / 5.08V
          3: 2.54v / 2.55V
          4: 0.00v / 0.00V
          5: 5.08v / 5.11V
          6: 0.07v / 0.07V
          7: 0.07v / 0.07V
          8: 5.04v / 5.08V
          9: 14.60v / 11.90V
          10: 0.00v / 0.00V
          11: 0.19v / 0.19V
          12: 14.06v / 11.30V
          13: 0.00v / 0.00V
          14: 0.27v / 0.25V
          15: 15.06v /12.2V
          16: 5.04v / 5.07V

          The next thing to test is CM812. I know your DMM does not have a capacitance function, so pull CM812, set your DMM to the 20 Megohm range, and touch the probes to the cap. You should get a reading that increases, eventually going open.

          PlainBill
          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

          Comment

          • zulururu
            Member
            • Aug 2011
            • 43

            #65
            Re: Samsung 2493 HM issue

            Thank you Plainbill, I will measure that, also my DMM doesn't have capacitance function, I discovered I have one at work I can use which has capacitance function, should I use that one instead ? If yes, to measure capacitance, should I desolder CM812 or there is no need for it ??

            Comment

            • zulururu
              Member
              • Aug 2011
              • 43

              #66
              Re: Samsung 2493 HM issue

              Hello again, I did the measurements with pin 4 as the ground and I have the same results +/-0.02v.... I will be waiting for your answer about CM812 and check it tomorrow .
              Have a good day,

              Zulururu

              Comment

              • PlainBill
                Badcaps Legend
                • Feb 2009
                • 7034
                • USA

                #67
                Re: Samsung 2493 HM issue

                Originally posted by zulururu
                Hello again, I did the measurements with pin 4 as the ground and I have the same results +/-0.02v.... I will be waiting for your answer about CM812 and check it tomorrow .
                Have a good day,

                Zulururu
                How about this - try checking it in circuit. If it reads 12nF +- 5%, it's good. If it reads anything else, pull it and check it out of circuit.

                PlainBill
                For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                Comment

                • zulururu
                  Member
                  • Aug 2011
                  • 43

                  #68
                  Re: Samsung 2493 HM issue

                  I had to desolder to have a correct reading and I have 11nF so I guess it's good....

                  Comment

                  • PlainBill
                    Badcaps Legend
                    • Feb 2009
                    • 7034
                    • USA

                    #69
                    Re: Samsung 2493 HM issue

                    Originally posted by zulururu
                    I had to desolder to have a correct reading and I have 11nF so I guess it's good....
                    Darn!!! Well, I'm going to go out on a limb and say that everything up to the driver transformer is good. As is my habit, I've marked up a picture.

                    Six areas of interest are circled, and lettered A-F. Standard precautions apply - don't electrocute yourself. Make sure any resistance measurements are made with the power off, any voltage measurements are made with the power on. You can use either the signal card or a 3.3K resistor to turn the main supply on.

                    F is a resistor, it is the resistor standing on end; it provides power to the transformer primary drivers. With power OFF measure the resistance.

                    E is a capacitor. With power on, measure the voltage across it.

                    A is the small transformer which isolates SMPS controller from the main FETS. Each yellow circle encloses the ends of one winding. Check for continuity of each winding.

                    D is the primary of the main SMPS transformer. Check continuity.

                    C are the main drive FETs. Check for shorts.

                    B Is a number of transistors and diodes that handle level shifting. Check for shorts.

                    PlainBill
                    Attached Files
                    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                    Comment

                    • alexanna
                      Member
                      • Mar 2010
                      • 1346

                      #70
                      Re: Samsung 2493 HM issue

                      Here is another long shot! But it won't take long to check.
                      If my memory serves me correctly, on the other style Power supply the 24volt rail had to come up before the 5.3 volt would start.
                      I don't know if this has been tried, but I wonder if there is a problem with the 24V within the inverter causing the second half of the power supply to shut down.
                      Have you tried this with the inverter unplugged? See if the 24 and 5.3 Volts comes up.
                      Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                      Comment

                      • zulururu
                        Member
                        • Aug 2011
                        • 43

                        #71
                        Re: Samsung 2493 HM issue

                        Thanks for you help !
                        Just to make sure, when you say "check for shorts" do I have to check for a resistance which mean with power off and in between 2 poles or between a pole and the ground ....or does it mean check for voltage between 2 poles or again between the pole and the ground ?? Excuse my ignorance !

                        Comment

                        • retiredcaps
                          Badcaps Legend
                          • Apr 2010
                          • 9271

                          #72
                          Re: Samsung 2493 HM issue

                          Originally posted by zulururu
                          Just to make sure, when you say "check for shorts" do I have to check for a resistance which mean with power off and in between 2 poles or between a pole and the ground
                          Checking for shorts (i.e. resistance) is always done with power off. Any resistance reading under 30 ohms suggests the component is shorted. If it is a 3 pin component, measure pins 1-2, 1-3, 2-3 (all possible combinations).
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                          Comment

                          • PlainBill
                            Badcaps Legend
                            • Feb 2009
                            • 7034
                            • USA

                            #73
                            Re: Samsung 2493 HM issue

                            Retiredcaps description is correct. When I say 'continuity', it means two points (in this case, the ends of a transformer winding) should be connected.

                            PlainBill
                            For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                            Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                            Comment

                            • zulururu
                              Member
                              • Aug 2011
                              • 43

                              #74
                              Re: Samsung 2493 HM issue

                              Thanks again for the explanation !
                              I did the measurements, Here are the results:

                              A/ all around 0.7 ohm

                              B/ As per the picture below:

                              For the 2 upper ones
                              Between pin 1-2: 23,4 ohms
                              Between pin 1-3: 23,4 ohms
                              Between pin 2-3: 0.5 ohm

                              For the 4 lower ones:
                              Between pin 1-3: no continuity (infinite)
                              Between 1-2: no continuity (infinite)
                              Between 2-3: 0.5 ohm
                              R1: 22.5 ohms
                              R2: 22,6 ohms
                              R3:22.6 ohms
                              R4: 22.5 ohms

                              C/ As per the picture below
                              Between 1-6: 23 ohms
                              Between 2-5: 0.7 ohm
                              Between 5-4: 23 ohms

                              D/0.7 ohm

                              E/ O volt

                              F/ 6590 ohms


                              Alexanna, I tried to unplug the inverter board, with the signal card plugged in though and I don't have +24 v but around 0.05V, same results with the inverter plugged in...
                              Even if my monitor doen't work, I'm still learning a lot of stuff ;-)
                              Attached Files

                              Comment

                              • retiredcaps
                                Badcaps Legend
                                • Apr 2010
                                • 9271

                                #75
                                Re: Samsung 2493 HM issue

                                Originally posted by zulururu
                                C/ As per the picture below
                                Between 1-6: 23 ohms
                                Between 2-5: 0.7 ohm
                                Between 5-4: 23 ohms
                                There are 2 FETs in area C. If my weak spatial mapping skills are correct, 1, 2 and 6 is one, 3, 4, and 5 is the other (as per PlainBill's numbering).

                                So you want to measure resistance (power off) between

                                1-2, 2-6, and 1-6.

                                3-4, 3-5, and 4-5.

                                You should have 6 readings.
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                                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.

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                                Comment

                                • PlainBill
                                  Badcaps Legend
                                  • Feb 2009
                                  • 7034
                                  • USA

                                  #76
                                  Re: Samsung 2493 HM issue

                                  Originally posted by zulururu
                                  Thanks again for the explanation !
                                  I did the measurements, Here are the results:

                                  A/ all around 0.7 ohm
                                  That is reasonable.
                                  Originally posted by zulururu
                                  B/ As per the picture below:

                                  For the 2 upper ones
                                  Between pin 1-2: 23,4 ohms
                                  Between pin 1-3: 23,4 ohms
                                  Between pin 2-3: 0.5 ohm

                                  For the 4 lower ones:
                                  Between pin 1-3: no continuity (infinite)
                                  Between 1-2: no continuity (infinite)
                                  Between 2-3: 0.5 ohm
                                  R1: 22.5 ohms
                                  R2: 22,6 ohms
                                  R3:22.6 ohms
                                  R4: 22.5 ohms
                                  All of these are reasonable. The three legged components are actually dual diodes and zener diodes, I believe.

                                  Originally posted by zulururu
                                  C/ As per the picture below
                                  Between 1-6: 23 ohms
                                  Between 2-5: 0.7 ohm
                                  Between 5-4: 23 ohms
                                  Please remeasure per retiredcaps suggestion.
                                  Originally posted by zulururu
                                  D/0.7 ohm
                                  This is reasonable; it's a transformer winding.
                                  Originally posted by zulururu
                                  E/ O volt

                                  F/ 6590 ohms
                                  These are mistakes on my part. Of course, the resistor is E, and I would like you to measure the resistance (power off); the capacitor is F, and I would like you to measure the voltage across it (power on).

                                  Originally posted by zulururu
                                  Alexanna, I tried to unplug the inverter board, with the signal card plugged in though and I don't have +24 v but around 0.05V, same results with the inverter plugged in...
                                  Even if my monitor doen't work, I'm still learning a lot of stuff ;-)
                                  PlainBill
                                  For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                  Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                  Comment

                                  • zulururu
                                    Member
                                    • Aug 2011
                                    • 43

                                    #77
                                    Re: Samsung 2493 HM issue

                                    Oups, Sorry about the measurement of area "C":

                                    1-2, 2-6, 5-3 and 3-4 gives me all no continuity (infinite resistance)

                                    - "E" gives me 0.6 ohm

                                    - "I" gives between 3V and 9V DC constantly changing .....

                                    Comment

                                    • zulururu
                                      Member
                                      • Aug 2011
                                      • 43

                                      #78
                                      Re: Samsung 2493 HM issue

                                      Oops, here comes something else, I juste checked for voltage on the big 450V 82 uF capacitor for voltage and, power On as well as power Off I have the same voltage 163V ( I used to have 378V with power ON, 163V with power Off)..... did I do anything wrong ?

                                      Comment

                                      • PlainBill
                                        Badcaps Legend
                                        • Feb 2009
                                        • 7034
                                        • USA

                                        #79
                                        Re: Samsung 2493 HM issue

                                        Originally posted by zulururu
                                        Oops, here comes something else, I juste checked for voltage on the big 450V 82 uF capacitor for voltage and, power On as well as power Off I have the same voltage 163V ( I used to have 378V with power ON, 163V with power Off)..... did I do anything wrong ?
                                        Possibly. I have been unable to locate a schematic for this power supply, however the design is identical to the BN44-00214A in this thread.

                                        I've being called away to fix dinner; I may not be able to get back to this tonight.

                                        PlainBill
                                        For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                        Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                        Comment

                                        • zulururu
                                          Member
                                          • Aug 2011
                                          • 43

                                          #80
                                          Re: Samsung 2493 HM issue

                                          Don't worry PlainBill, take your time and Bon appetit ;-)

                                          Comment

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