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Viewsonic VX2250WM - LED!

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    #1

    Viewsonic VX2250WM - LED!

    First LED repair which will be quite exciting yet nervous cause this model is only 6 months old and I did a few basic google searches and so far no real information on repairs. Taking this thing apart was a real treat cause it is alot thinner than traditional monitors and has 3 thin ribbon cables running to the panel. Not to mention there is a 3rd board in the little chassis.

    Symptom: Plug in, now power, no light, no nothing.
    So far for visual inspection, no blow caps or cold soldering or board burn marks.

    Even though I know what I should check, I'd like to take a systematic approach to repairing this monitor to get practice rather than jumping to the obvious. So, if anyone has a list of 'to-dos' that would be greatly much appreciated.

    (Sorry for the bad pictures, didn't want to set up my normal lighting tonight to take 6-8 pictures. BTW if you click on the pictures below, it will open a window within this one, click on it again and it will open the picture in the new tab, and you can click on it again to get a larger picture)
    Attached Files
    Last edited by Ritalin; 02-11-2011, 10:42 PM.
    Tags: None
    #2
    Re: Viewsonic VX2250WM - LED!

    Originally posted by Ritalin View Post
    this model is only 6 months old
    No Warranty?

    Symptom: Plug in, now power, no light, no nothing.
    Check for AC mains x 1.414 = roughly 165V DC voltage across the large capacitor (C804). If present, check for secondary voltages to the logic board. If not present, check for blown fuse or shorted bridge rectifier.
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    Comment

      #3
      Re: Viewsonic VX2250WM - LED!

      Originally posted by retiredcaps View Post
      No Warranty?
      Original owner lost proof of purchase and claimed they called and were denied replacement.

      Comment

        #4
        Re: Viewsonic VX2250WM - LED!

        For a 'totally dead' problem I usually check the output of the power supply first. If there is no output, I go check across the large cap. I prefer to keep the probes away from them whenever possible.

        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: Viewsonic VX2250WM - LED!

          Yours is first ever to grace badcaps forums with this LED backlight monitor.

          Cheers, Wizard

          Comment

            #6
            Re: Viewsonic VX2250WM - LED!

            Originally posted by PlainBill View Post
            For a 'totally dead' problem I usually check the output of the power supply first. If there is no output, I go check across the large cap. I prefer to keep the probes away from them whenever possible.
            PlainBill's method is safer. I now use aligator clips leads when possible for measuring the main filter capacitor.
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            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.

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            Comment

              #7
              Re: Viewsonic VX2250WM - LED!

              That mains cap would be a pain in the ass to find a replacement for. Looks like some custom made job.
              What is its rating?

              Comment

                #8
                Re: Viewsonic VX2250WM - LED!

                Looks like I'm just going to RMA the sucker even though I'm not the original owner. So this will not be the first LED repair of badcaps.net

                Comment

                  #9
                  Re: Viewsonic VX2250WM - LED!

                  Can you even do that now you've opened it?

                  Comment

                    #10
                    Re: Viewsonic VX2250WM - LED!

                    Just a FYI. I recently came across one of these VX2250WM exhibiting this no power/lights symptom. My work has lots of them so I was able to compare it to another and found that the power button was stuck in due to a design flaw lip ridge in the button cavity and an overzealous user mashing it in past the lip so it was stuck. I confirmed on the spare that holding the power button down when plugging it in caused it to look dead. There was no way to pry the button out from the front so I took the stand off and drilled a small hole through the clear plastic behind the button and push it out with a paperclip. Has worked fine ever since.

                    Comment

                      #11
                      Re: Viewsonic VX2250WM - LED!

                      Originally posted by Supa View Post
                      Just a FYI. I recently came across one of these VX2250WM exhibiting this no power/lights symptom. My work has lots of them so I was able to compare it to another and found that the power button was stuck in due to a design flaw lip ridge in the button cavity and an overzealous user mashing it in past the lip so it was stuck. I confirmed on the spare that holding the power button down when plugging it in caused it to look dead. There was no way to pry the button out from the front so I took the stand off and drilled a small hole through the clear plastic behind the button and push it out with a paperclip. Has worked fine ever since.
                      Hah hah! Great work! Now to keep a lookout for people advertising "dead" VX2250's!

                      Comment

                        #12
                        Re: Viewsonic VX2250WM - LED!

                        Bought the VX2250WM and after 3 weeks it died. The blue light on/off button is constantly lit, but there's nothing on the display, tried connecting to different computer with VGA or DVI with no luck.

                        I used my spare monitor and forgot about this one. One week later and I plugged it in and it started working again. Alas after 4 hours it died again, but this time the blue light is off.

                        Left it unplugged for one night and hey presto it works again. Well I've called tech support and they will pickup and hopefully fix this annoying problem.

                        The other problem it exhibits is after running for about 15 mins, you can't switch the monitor off from the on/off button.
                        Last edited by vxuser1; 05-04-2011, 10:20 PM.

                        Comment

                          #13
                          Re: Viewsonic VX2250WM - LED!

                          Originally posted by vxuser1 View Post
                          Bought the VX2250WM and after 3 weeks it died. The blue light on/off button is constantly lit, but there's nothing on the display, tried connecting to different computer with VGA or DVI with no luck.

                          I used my spare monitor and forgot about this one. One week later and I plugged it in and it started working again. Alas after 4 hours it died again, but this time the blue light is off.

                          Left it unplugged for one night and hey presto it works again. Well I've called tech support and they will pickup and hopefully fix this annoying problem.

                          The other problem it exhibits is after running for about 15 mins, you can't switch the monitor off from the on/off button.
                          hi, same problem of mine, did you fixed/repaired already?

                          Comment

                            #14
                            Re: Viewsonic VX2250WM - LED!

                            Originally posted by blackmtx View Post
                            hi, same problem of mine, did you fixed/repaired already?
                            yes, they replaced with new monitor, work fine now.

                            Comment

                              #15
                              Re: Viewsonic VX2250WM - LED!

                              I also have a Viewsonic VX2250 with an odd problem. The menu button (not really a button, but more of a touch sensitive area) is stuck on. It usually brings up the menu after a few minutes of the monitor being on and uncontrollably scrolls through the audio adjust menu. If I turn the monitor off and on it comes back after a few seconds or minutes. HELP!

                              Comment

                                #16
                                Re: Viewsonic VX2250WM - LED!

                                I've had the Viewsonic VX2250 monitor since 12/2010. In the last few months it has ocassionally gone black for a few seconds, then return. The blue power light remains on, and remains blue at all times. Recently, this is happening more frequently. I've updated the driver to Win 7-64. I've run the monitor on another computer and have the same problem, so I have ruled out driver and graphic card as the problem. I'm thinking that I have a leaky cap on the power supply board of the monitor. Has anyone else had this problem? Am I headed down the right path? Has anyone replaced the caps or do you know of a YouTube video that shows which caps to replace? Thanks for your help!

                                Comment

                                  #17
                                  Re: Viewsonic VX2250WM - LED!

                                  VX series and actually just about all the Viewsonic monitors failed due to bad caps, that will be the first thing to look for.
                                  See my pictures of failed viewsonic here:http://s807.photobucket.com/albums/y...udm/VIEWSONIC/
                                  You will replace them as a set of caps.
                                  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

                                    #18
                                    Re: Viewsonic VX2250WM - LED!

                                    hi all ,
                                    i am a lcd repair guy from Taiwan , just solve a failure case vx2250wm same as told of 16f , found x101 almost malfunction ( not totally dead ) , please using scope touch the pins of x101, if system shutdown ( it should not ) ,
                                    then please try replace the x'tal about 12.000mhz.
                                    the amptitude of frequency was lower then a normal item , when scope touching , the amptitude gone , then it will come back again in few second , the picture maybe goes white or goes black with backlite on .

                                    and had backup the file about the firmware from pm25lv020 , if somebody need it please let me know .

                                    the caps was fine ,no need to replace.
                                    Last edited by nicholas hu; 02-11-2013, 01:17 PM.

                                    Comment

                                      #19
                                      Re: Viewsonic VX2250WM - LED!

                                      If anyone is interested, my monitor exhibited the same symptoms. No power, mo power LED ON. Clue was that the voltage across C807 was 7V. it should be 16V. Further measurements showed that the +19V rail showed 6 ohms to ground. The problem was traced to C504 ceramic capacitor (2.2uF, 50V). Removal of the offending capacitor cleared the problem. Replacement resulted in a working monitor.
                                      Attached Files

                                      Comment

                                        #20
                                        Re: Viewsonic VX2250WM - LED!

                                        Where is this C807, the picture shows the board with 5xx designators? Power supply board? 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

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