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Samsung SyncMaster 920N problems

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    #1

    Samsung SyncMaster 920N problems

    Hello to all and greetings from Greece.

    I am new at this so bear with me on my first post.

    I have not one not two but three SyncMaster 920N in my possession and they all have a problem. The funny think is that the boards inside are not the same. The two with the MJ19BS board have the 2 seconds to off problem (in my case 0.5 seconds) and the third one with another board has a blinking led problem.

    After i read many post on this problems i decided to give it a try in fixing them.

    First of all i will have to change all the electrolytic caps on the three boards but i would like your help in checking if my replaces are correct.

    The caps on the MJ19BS board are
    C 607 SAMXON KM 47uF 25V V3A / 105C / C6
    Replacement PANASONIC FR 47uF 25V EEUFR1E470

    C611,612,614,615SAMXON GF 100uF 16V V2A / 105C / C6
    Replacement Not found. If you could help please. No Panasonic with this ripple current

    C 605 CAPXON KM 100uF 450V C616 / 105C / VENT
    Replacement Not found. If you could help please. No Panasonic with this capacity in 450V

    C 617 CAPXON KF 470uF 25V C612 / 105C / VENT
    Replacement PANASONIC FR 470uF 25V EEUFR1E471

    The caps in the other board are
    C 303,304 CAPXON ST 33uF 25V ST / 105C / C624
    Replacement PANASONIC KS 33uF 25V ECEA1EKS330

    C 302 CAPXON GL 330uF 25V C624 / 105C / VENT
    Replacement PANASONIC FR 330uF 25V EEUFR1W331

    C 105 CAPXON KM 100uF 450V C622 / 105C / VENT
    Replacement Not found. If you could help please. No Panasonic with this capacity in 450V

    C 107 CAPXON KM 47uF 50V C626 / 105C / VENT
    Replacement PANASONIC FC 47uF 50V EEUFC1H470

    C 108 CAPXON KM 10uF 50V C626 / 105C
    Replacement PANASONIC FC 10uF 50V EEUFC1H100L

    C 109,110 CAPXON KM 1000uF 10V C622 / 105C / VENT
    Replacement PANASONIC FR 1000uF 10V EEUFR1A102L

    C 111 CAPXON GL 820uF 25V C622 / 105C / VENT
    Replacement PANASONIC FR 820uF 25V EEUFR1E821

    C 112 CAPXON GL 820uF 25V C624 / 105C / VENT
    Replacement PANASONIC FR 820uF 25V EEUFR1E821

    C 113 CAPXON KM 330uF 10V C626 / 105C / VENT
    Replacement PANASONIC FC 330uF 10V EEUFC1A331

    Sorry for the long post. Any help appreciated
    Tags: None
    #2
    Re: Samsung SyncMaster 920N problems

    I'm not sure what vendor you are using and I have no idea whether

    http://uk.farnell.com/

    is suitable for Greece or not, but Farnell has many choices for 100uF 450V from Nichicon, Rubycon, Panasonic, and United Chemicon.

    As for choosing replacements, PCBONEZ talks about it here

    https://www.badcaps.net/forum/showpo...47&postcount=3
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      #3
      Re: Samsung SyncMaster 920N problems

      Thank you very much retiredcaps, i have no vendor yet because its my first attempt in repairing such thinks, and the local stores i used to buy supplies for my school projects don't have so much variety. I found digikey and RS from the FAQ but uk.farnell seems good to.
      I choose Panasonic because i know the name, but if the others are quality caps to i don't have a problem with the brand. Any of the above brand will do?

      Comment

        #4
        Re: Samsung SyncMaster 920N problems

        Check the third link in my signature.

        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

          #5
          Re: Samsung SyncMaster 920N problems

          Well after a lot of waiting and two vendors (digikey and mouser) i have collected the caps i wanted and have started repairing the monitors. The one of two with the MJ19BS board is working just fine. The second one started fine (no 2 seconds to off) but after 2-3 minutes the the image went all wrong (i will post an image for you to see what i mean). If i leave the monitor over night not connected the next day it does the same (first ok and after 2-3 minutes bad image
          Any ideas?
          Attached Files

          Comment

            #6
            Re: Samsung SyncMaster 920N problems

            Originally posted by techinfogr View Post
            Any ideas?
            Look at PlainBill's signature file to see how to post clear focused pictures of your power and logic boards. Please use the manage attachments and do not post inline.
            --- 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

              #7
              Re: Samsung SyncMaster 920N problems

              Are any of the logic boards the same in the monitors?
              Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

              Comment

                #8
                Re: Samsung SyncMaster 920N problems

                Originally posted by techinfogr View Post
                If i leave the monitor over night not connected the next day it does the same (first ok and after 2-3 minutes bad image
                Any ideas?
                From one to another, I would measure output voltages when cold vs. warm and see if there is any unstable voltages after it warms up, might give a clue where to start. Also you could swap boards with on of the working ones, just to verify what board the problem really lies on. Being new at this myself, I was recently thinking I had a power supply problem on a completely dead screen and it ended up being the logic board. ...my 2 cents...

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