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Samsung SyncMaster Model 731N Distorted Display

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    #21
    Re: Samsung SyncMaster Model 731N Distorted Display

    Okay now I understand. Some old sound cards might have fixed 1.8V regulators.
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      #22
      Re: Samsung SyncMaster Model 731N Distorted Display

      I will look at our old sound cards. I think we may have a few of them yet.

      Thanks for your help.
      Last edited by trains58554; 04-09-2012, 03:35 PM.

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        #23
        Re: Samsung SyncMaster Model 731N Distorted Display

        Originally posted by trains58554 View Post
        I will look at our old sound cards. I think we may have a few of them yet.
        I found one on an old sound blaster here at home.
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          #24
          Re: Samsung SyncMaster Model 731N Distorted Display

          We only had two or three sound cards left and none of them had the chip.

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            #25
            Re: Samsung SyncMaster Model 731N Distorted Display

            @retiredcaps would a 6206a 18 work?

            Thanks

            Jay

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              #26
              Re: Samsung SyncMaster Model 731N Distorted Display

              Originally posted by trains58554 View Post
              @retiredcaps would a 6206a 18 work?
              6206a is a voltage regulator from the datasheets that I have seen and 18 is denoting 1.8V DC so it should work.
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                #27
                Re: Samsung SyncMaster Model 731N Distorted Display

                well I think that chip would have worked if I would not of broken it. Oh well I guess I will just keep picking though the bone yard and maybe get lucky again.

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                  #28
                  Re: Samsung SyncMaster Model 731N Distorted Display

                  Will the TLV1117-18CDCYR work?

                  Thanks for all your help.

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                    #29
                    Re: Samsung SyncMaster Model 731N Distorted Display

                    TLV1117-18CDCYR data sheet
                    Attached Files
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

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                      #30
                      Re: Samsung SyncMaster Model 731N Distorted Display

                      Hi

                      Thanks for your reply I have looked at the data sheet and as far as I can tell it should work.

                      Thanks

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                        #31
                        Re: Samsung SyncMaster Model 731N Distorted Display

                        Originally posted by trains58554 View Post
                        Hi

                        Thanks for your reply I have looked at the data sheet and as far as I can tell it should work.

                        Thanks
                        Since you have access to the data sheet, you can test out the regulator by hooking up a 9V battery to the input and measuring the output with your meter. You should read 1.8V.

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                          #32
                          Re: Samsung SyncMaster Model 731N Distorted Display

                          Hi All,

                          Thank you everyone I got my replacement voltage regulator and installed it now the monitor works just like it did when it was brand new.

                          Thank you everyone.

                          Jay

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                            #33
                            Re: Samsung SyncMaster Model 731N Distorted Display

                            Well done Jay.

                            Thanks for letting us know that its worked out ok for you.
                            Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

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                            Retiredcaps Ideal post example click HERE

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                              #34
                              Re: Samsung SyncMaster Model 731N Distorted Display

                              Has anybody tried to figure out why this regulator fails? I have one of these monitors with no backlight (a completely unrelated problem), and I want to make sure I don't have any other problems once I fix the inverter. Is it just a cheap, low-quality part, or is there something else that will make even a name-brand part fail?

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                                #35
                                Re: Samsung SyncMaster Model 731N Distorted Display

                                Originally posted by lti View Post
                                Is it just a cheap, low-quality part, or is there something else that will make even a name-brand part fail?
                                Vizio TVs seem to have a lot of problems with bad voltage regulators. While I'm no design pcb engineer, I suspect it is a combination of lowest possible cost parts and poor circuit design.

                                The regulators could be failing because they are designed without any "support" components or they are cheaper to use versus something more expensive.
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                                  #36
                                  Re: Samsung SyncMaster Model 731N Distorted Display

                                  Originally posted by retiredcaps View Post
                                  Vizio TVs seem to have a lot of problems with bad voltage regulators. While I'm no design pcb engineer, I suspect it is a combination of lowest possible cost parts and poor circuit design.

                                  The regulators could be failing because they are designed without any "support" components or they are cheaper to use versus something more expensive.
                                  The circuit design is really strange. I could see Samsung screwing up the circuit design that badly. For some reason, they put random diodes in parallel with components in the inverter where diodes are not needed.

                                  The regulators on my board are out of the 1% tolerance (1.76V for the 1.8V regulator and 3.25V for the 3.3V regulator), but they are probably a cheaper version with wider tolerances. The board still works perfectly.

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                                    #37
                                    Re: Samsung SyncMaster Model 731N Distorted Display

                                    Originally posted by lti View Post
                                    The regulators on my board are out of the 1% tolerance (1.76V for the 1.8V regulator and 3.25V for the 3.3V regulator), but they are probably a cheaper version with wider tolerances.
                                    Some datasheets I have seen say 2% is still within specifications.

                                    The tolerance also depends on how accurate your multimeter is. Today's cheapest multimeters have 0.5% DCV accuracy and most of them use the Intersil 7106 chip or some variation. How long the cheap ones stay within the 0.5% is the key question.
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