Sony SDM-HS73 on for 2 seconds then off

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  • retiredcaps
    Badcaps Legend
    • Apr 2010
    • 9271

    #41
    Re: Sony SDM-HS73 on for 2 seconds then off

    Originally posted by Freezer
    This will be the 3rd monitor I've worked on, so I have some experience.

    [*]If all else fails I may consider CCFL replacement.
    If you already have 2 working monitors, you can stretch the ccfl cable from the Sony to one of the working ones as a test.
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    Comment

    • Freezer
      Senior Member
      • Jun 2010
      • 124

      #42
      Re: Sony SDM-HS73 on for 2 seconds then off

      Using the schematic in this thread I tested the 4 mosfets as suggested. All 4 check out okay. None of them indicate a short, and all 4 have very similar readings. I'm in the process of more thoroughly testing the inverters, I'll report back with those number soon.

      I just acquired a broken Viewsonic Q191wb (19" widescreen) off craigslist. Can I use this monitor to test the CCFLs in the Sony and vise versa? I'm not sure since the Sony is a 17" and the Viewsonic is a 19". Also, I'm not sure if the different makes would cause a problem.

      So in addition to my posts on the Sony SDM-HS73, I'll be posting soon in the existing thread for Q191wb.

      Comment

      • PlainBill
        Badcaps Legend
        • Feb 2009
        • 7034
        • USA

        #43
        Re: Sony SDM-HS73 on for 2 seconds then off

        Originally posted by Freezer
        Using the schematic in this thread I tested the 4 mosfets as suggested. All 4 check out okay. None of them indicate a short, and all 4 have very similar readings. I'm in the process of more thoroughly testing the inverters, I'll report back with those number soon.

        I just acquired a broken Viewsonic Q191wb (19" widescreen) off craigslist. Can I use this monitor to test the CCFLs in the Sony and vise versa? I'm not sure since the Sony is a 17" and the Viewsonic is a 19". Also, I'm not sure if the different makes would cause a problem.

        So in addition to my posts on the Sony SDM-HS73, I'll be posting soon in the existing thread for Q191wb.
        You can try using the CCFLs in one to test the other. Of course, if the CCFLs in both are bad....

        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

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271

          #44
          Re: Sony SDM-HS73 on for 2 seconds then off

          Originally posted by Freezer
          I'm not sure since the Sony is a 17" and the Viewsonic is a 19"
          Members report that a couple of inches difference doesn't make matter for this test. If the difference was more like 4 or 5 inches, it may make a difference.
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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.

          Please do not post inline and offsite as they slow down the loading of pages.

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          Comment

          • Freezer
            Senior Member
            • Jun 2010
            • 124

            #45
            Re: Sony SDM-HS73 on for 2 seconds then off

            I replaced the 4 27K3KV ceramic disc capacitors but that didn't fix the problem. I am beginning to suspect one of the inverters is bad. Between several of the pins the resistance starts at 6+ mohm and then after about 1 second it drops to several hundred kohms. This only happens on one transformer, but consistently happens between a certain group of pins. So I'm thinking either the transformer is bad, but I guess it's possible a short in the board is causing this as well. My plan is to try and desolder the transformers and test them out of circuit. Should be interesting, I've never tried to desolder something with so many pins.

            Comment

            • Freezer
              Senior Member
              • Jun 2010
              • 124

              #46
              Re: Sony SDM-HS73 on for 2 seconds then off

              I did want to make one final post on this monitor. I never did fix this monitor, instead I decided to use the monitor as a learning experience. I completely disassembled the panel. I was curious to see the make up of the inside of the panel. That way, if in the future I have a monitor that needs CCFL replacing I know what to expect. All and all this was a fun project, I'm just a little bummed I wasn't able to fix it.

              Even though I wasn't able to fix it, I *believe* I found the problem. The upper inverter would briefly produce an electric noise almost like it was arcing. Also, I was getting some very inconsistent resistance readings from the inverter. So I suspect this inverter went bad.

              While working on this monitor there were a few things which struck me.

              1. The build quality on this monitor was higher than that of many other monitors. The frame contained more metal and less plastic than you would typically find. Probably my favorite feature was the fact the monitor was assembled using screws instead of plastic tabs - this made it easy to disassemble.

              2. The internal components were nicer than I was expecting. I recently got an ESR meter and I went back and retested all the caps in this monitor. They all tested good. I also noticed the caps were high quality caps to begin with. After working on so many cheap monitors like Samsung and ViewSonic it's nice to see one with decent components for once.

              I guess both of these are to be expected when you spend a little more for a nicer brand like Sony versus the el-cheapo brands.

              Comment

              • jetadm123
                Badcaps Legend
                • Feb 2010
                • 2169

                #47
                Re: Sony SDM-HS73 on for 2 seconds then off

                Originally posted by Freezer
                I did want to make one final post on this monitor. I never did fix this monitor, instead I decided to use the monitor as a learning experience. I completely disassembled the panel. I was curious to see the make up of the inside of the panel. That way, if in the future I have a monitor that needs CCFL replacing I know what to expect. All and all this was a fun project, I'm just a little bummed I wasn't able to fix it.

                Even though I wasn't able to fix it, I *believe* I found the problem. The upper inverter would briefly produce an electric noise almost like it was arcing. Also, I was getting some very inconsistent resistance readings from the inverter. So I suspect this inverter went bad.

                While working on this monitor there were a few things which struck me.

                1. The build quality on this monitor was higher than that of many other monitors. The frame contained more metal and less plastic than you would typically find. Probably my favorite feature was the fact the monitor was assembled using screws instead of plastic tabs - this made it easy to disassemble.

                2. The internal components were nicer than I was expecting. I recently got an ESR meter and I went back and retested all the caps in this monitor. They all tested good. I also noticed the caps were high quality caps to begin with. After working on so many cheap monitors like Samsung and ViewSonic it's nice to see one with decent components for once.

                I guess both of these are to be expected when you spend a little more for a nicer brand like Sony versus the el-cheapo brands.

                Yes, it is too bad that you couldn't repair it. I've seen several sony monitors on this site with problems similar to yours that also went unfixed. Hopefully, someone will find some common part that has failed on these models. Although, it would seem that you've come close with a possible failed inverter transformer. Hopefully, you can find a replacement transformer to prove your theory.

                Comment

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