Samsung Syncmaster 215tw no backlight

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  • garrymc123
    Badcaps Veteran
    • Apr 2010
    • 336
    • United Kingdom
    #1

    Samsung Syncmaster 215tw no backlight

    Hi there again hope some one can help me with this one i have a samsung syncmaster 215tw that the backlight has gone. So i have removed six capacitors to check them with a capacitor meter all caps are made by capxon.
    First i checked caps C327 & C328 which both are 1000uf 25v but on test i get 1025uf on one and the other 1018uf. One the next two which is C263 & C261
    which are also 1000uf 25v but on test i get 1073uf and 1088uf
    and the last cap to test is a 470uf 25v but on test i get 501uf .What i want to know is are all these caps nackered or are they within there tollerences. i will add a pic to show which caps i have tested. Any help appreciated guys thanks again.

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    • Rtech
      Badcaps Legend
      • Jul 2010
      • 1095
      #2
      Re: Samsung Syncmaster 215tw no backlight

      Electrolytics normally plus or minus 20%..so i'm sure you can do the maths,lol.

        Comment

        • smason
          Badcaps Legend
          • Feb 2010
          • 1652
          • Canada
          #3
          Re: Samsung Syncmaster 215tw no backlight

          They're probably within tolerance *capacitance* wise, but that's not the only measure of capacitor health.
          The ESR is very important, especially in modern switchmode circuits.
          If it were my monitor, I wouldn't even drag out my ESR meter, I'd just replace them, as they're a known bad brand. I'm not saying that's what's wrong with your monitor, but it could very well be.
          36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271
              #4
              Re: Samsung Syncmaster 215tw no backlight

              Originally posted by garrymc123
              i have a samsung syncmaster 215tw that the backlight has gone.
              If there is no backlight, not even a brief flash, I would check for a fuse in the inverter section of the board (upper half).

              Additionally, there my be transistors or mosfets that are shorted.

              Your pic is a bit fuzzy. Try to get a more clear one and please post a pic of the backside as well.

              Please do not post pictures inline.

              Take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focus pictures. Try to get a photo that is 2000x2000 resolution or as close as possible.

              Here is an example of the pictures we want.

              https://www.badcaps.net/forum/showpo...94&postcount=1
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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.

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