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    #1

    Strange Problem with Viewsonic VX2235wm-5.

    G' Day all, I got this Viewsonic VX2235wm-5 from a relative of mine. They told me that they haven't used it for sometime, but they claimed it worked before they put it away for some time. Now, when I plug it in, the only thing that comes to live with only the blue led, turning dimmer after 1-2 sec after plug-in(lcd starting?).

    Anyway, took it apart and there were no bulging caps, visible heat damage to the metal cage around the where the heatsinks were. Then I noticed a 2200uF 10V SamXon cap in the "heat box of death". When powered on, it was uncomfortably hot after running for 2-3 minutes.(shorted cap?)

    I guess it's safe to say that the primary fuses aren't blown?

    I have successfully found a similar thread but it was left hanging.(and had a completely different problem). If I missed out anything, feel free to leave it in the comments.

    Thanks in advance.
    Attached Files
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    #2
    Re: Strange Problem with Viewsonic VX2235wm-5.

    Mains fuse is ok but have you checked the back of your board. Cant help as you have not posted a picture of the backs.
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

      #3
      Re: Strange Problem with Viewsonic VX2235wm-5.

      Originally posted by selldoor View Post
      Mains fuse is ok but have you checked the back of your board. Cant help as you have not posted a picture of the backs.
      Sorry, pictures are attached.
      Attached Files

      Comment

        #4
        Re: Strange Problem with Viewsonic VX2235wm-5.

        I think the question to ask here is can you see anything on the screen using the flashlight?
        (look carefully)

        That will determine if you have inverter or power problem.
        Now it looks like it tries to start and some error sends it into protection shutdown.
        stay classy

        Comment

          #5
          Re: Strange Problem with Viewsonic VX2235wm-5.

          Originally posted by Joe Black View Post
          I think the question to ask here is can you see anything on the screen using the flashlight?
          (look carefully)

          That will determine if you have inverter or power problem.
          Now it looks like it tries to start and some error sends it into protection shutdown.

          Oh dear, I should mention more details next time. I had pointed a torch on the front and nothing. Not even a faint "no signal". I starting to think that the cap is shorted or something.

          Comment

            #6
            Re: Strange Problem with Viewsonic VX2235wm-5.

            Originally posted by Scorpent View Post
            Sorry, pictures are attached.
            General idea of posting a picture is that we should be able to see what is on it.
            At a minimum we should be able to read the board markings.

            You could always try just changing that one cap?
            Last edited by selldoor; 10-27-2015, 10:56 AM.
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

              #7
              Re: Strange Problem with Viewsonic VX2235wm-5.

              Perhaps a shorted MOSFET causing the cap to get hot.

              Comment

                #8
                Re: Strange Problem with Viewsonic VX2235wm-5.

                Originally posted by selldoor View Post
                General idea of posting a picture is that we should be able to see what is on it.
                At a minimum we should be able to read the board markings.

                You could always try just changing that one cap?
                Okay, Selldoor I had changed the cap and it works! Thanks a lot! Sorry you had to put up with my slow response time. But was the cap heating up because it's shorted?

                Comment

                  #9
                  Re: Strange Problem with Viewsonic VX2235wm-5.

                  It is unlikely to have been shorted. Shorted caps usually burn up and quickly become open. More likely is it was poorly rated for its position and was just
                  in the process of dying. May even have been a poor solder joint . Hopefully you will have replaced it with a 105 degree good quality cap. Test what other components are in that area and test run it for a while to see if it overheats again
                  Please upload pictures using attachment function when ask for help on the repair
                  http://www.badcaps.net/forum/showthread.php?t=39740

                  Comment

                    #10
                    Re: Strange Problem with Viewsonic VX2235wm-5.

                    The originals look like Capxon (aka Crapxon) branded caps. If yes, replace them all now before they all bulge with something like Panasonic FR, FM or FC series (low ESR caps).
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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.

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                      #11
                      Re: Strange Problem with Viewsonic VX2235wm-5.

                      Originally posted by selldoor View Post
                      It is unlikely to have been shorted. Shorted caps usually burn up and quickly become open. More likely is it was poorly rated for its position and was just
                      in the process of dying. May even have been a poor solder joint . Hopefully you will have replaced it with a 105 degree good quality cap. Test what other components are in that area and test run it for a while to see if it overheats again
                      Hmmm, I didnt have too many good caps in my inventory so I just threw in a Teapo temporarily. The heatsinks get hot due to poor dissipation. I'm thinking of repositioning the cap using wires to another place.
                      Last edited by Scorpent; 11-01-2015, 08:04 AM. Reason: spelling issues.

                      Comment

                        #12
                        Re: Strange Problem with Viewsonic VX2235wm-5.

                        It is not generally recommended - The legs on caps should be a short as possible
                        as long legs alters the ESR of the cap. Better to buy a decent cap- see if you can get one in the size you need rated at 125 degrees.

                        Also if you can get at it try and measure the voltage on the cap and test for a 10 seconds or so to see if it is fluctuating.
                        Last edited by selldoor; 11-02-2015, 11:50 AM. Reason: test voltage
                        Please upload pictures using attachment function when ask for help on the repair
                        http://www.badcaps.net/forum/showthread.php?t=39740

                        Comment

                          #13
                          Re: Strange Problem with Viewsonic VX2235wm-5.

                          Originally posted by selldoor View Post
                          It is not generally recommended - The legs on caps should be a short as possible as long legs alters the ESR of the cap.
                          +1. You see a lot of people on youtube bodge it this way, but don't do it.

                          Better to buy a decent cap- see if you can get one in the size you need rated at 125 degrees.
                          Rubycon's RX series goes up to 130C.

                          https://cdn.badcaps-static.com/pdfs/...b5c4dc5986.pdf
                          --- 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

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