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    #1

    replaced caps on viewsonic vx924

    Hi guys great forum, first time here.
    Ok here's my story...I've got a mix of about 10 Viewsonic Vx922 and VX924
    19" monitors with what all appear to have bad caps. The first one I started on is a Vx924. I replaced the bulging caps with Nichicon 470uf 25v type pw with no success so I went back and replaced the caps that wern't bulging (470 25v) and yippee it fired right up for about 2-3minutes and then the display started flashing it would have a picture for like 1 sec and be black for like 2-3 seconds. After visiting your wonderful forum I've read about the different types of caps and that low esr is preferable.

    So here are my questions...

    1st would the higher esr cap cause the display to flash?
    2nd would the smaller capacitors on the p/s be the culprit?
    3rd should i replace all the caps on the I think you call the inverter board?

    Thanks for your time,

    Rick
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    #2
    Re: replaced caps on viewsonic vx924

    Originally posted by River_Rat
    Hi guys great forum, first time here.
    Ok here's my story...I've got a mix of about 10 Viewsonic Vx922 and VX924
    19" monitors with what all appear to have bad caps.
    I fixed a VX922 and using it now. It was simply replacing a few caps. Getting/finding a 470uF 10V to fit heightwise was challenging.


    So here are my questions...

    1st would the higher esr cap cause the display to flash?
    2nd would the smaller capacitors on the p/s be the culprit?
    3rd should i replace all the caps on the I think you call the inverter board?
    1) You want low ESR caps (low ohms). High ESR caps could cause a number of problems. You need an ESR meter to test ESR. Visual inspection and a multimeter will not suffice.

    2) The small "run up"/"start up" capacitors are usually 1uF/2uF and 25V/50V. Some will also be 22uF 25V. These could also be bad.

    In some instances, the big main filter cap 100uF 450V could also be a problem. In a recent thread, one person's flickering/flashing problem went away by replacing the main filter cap. Yours may not have the same problem.

    3) Yes. If the monitors have bad visible bloated caps, there is a good chance that ALL the caps need replacing. Most here will tell you to replace ALL caps with low ESR caps from manufacturers like United Chemicon, Panasonic, Rubycon, and Nichicon.

    Monitors that flash 2 seconds and go to black are a bit harder to troubleshoot, but doable. I suggest you fix the "low hanging fruit - simple cap replacements" first to get more experience and confidence (like I did) and then tackle the 2 seconds to black last.
    Last edited by retiredcaps; 07-22-2010, 02:04 PM.
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      #3
      Re: replaced caps on viewsonic vx924

      Originally posted by River_Rat
      Hi guys great forum, first time here.
      Ok here's my story...I've got a mix of about 10 Viewsonic Vx922 and VX924
      19" monitors with what all appear to have bad caps. The first one I started on is a Vx924. I replaced the bulging caps with Nichicon 470uf 25v type pw with no success so I went back and replaced the caps that wern't bulging (470 25v) and yippee it fired right up for about 2-3minutes and then the display started flashing it would have a picture for like 1 sec and be black for like 2-3 seconds. After visiting your wonderful forum I've read about the different types of caps and that low esr is preferable.

      So here are my questions...

      1st would the higher esr cap cause the display to flash?
      2nd would the smaller capacitors on the p/s be the culprit?
      3rd should i replace all the caps on the I think you call the inverter board?

      Thanks for your time,

      Rick
      First, 'What Caps Should I Buy'. Next, 'Where can I buy them'. At a quick glance, Nichicon PW should have been good enough, but where did you buy them? There are a lot of suppliers selling counterfeit caps on eBay.

      High ESR caps can cause many problems. They routinely cause the 'two seconds to black' problem, they could be causing the display to flash, or it could be something else.

      The small caps on the hot side of the power supply are notorious for causing problems, including possibly this one. This is the reason I STRONGLY recommend replacing all the caps on the power supply, with the possible exception of the large (typically 100uF, 450 volt) one. Saving $.56 so you can open the monitor up again in a few hours isn't my idea of a good deal.

      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

        #4
        Re: replaced caps on viewsonic vx924

        Thank you sir, I'll move on to the next monitor and replace with low esr.

        Rick

        Comment

          #5
          Re: replaced caps on viewsonic vx924

          Originally posted by River_Rat
          Thank you sir, I'll move on to the next monitor and replace with low esr.
          The other nice thing about working on the low hanging fruit problems is that you will probably have 5 or 6 working monitors out of the 10. This means you can compare and swap known good parts for the bad to narrow down the "tough" 4 or 5.
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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

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