Princeton VL193 intermittent flicker

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  • ravenor
    Member
    • Sep 2011
    • 27
    • USA
    #1

    Princeton VL193 intermittent flicker

    My VL193 flickers intermittently. The flicker usually goes away when I power it off and power it back on but sometimes it remains. I have posted pictures of an overhead view of the power supply and two closeups of the inverter.
    Attached Files
    Last edited by ravenor; 05-09-2012, 07:34 PM.
    Tags: None
    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: Princeton VL193 intermittent flicker

      1) It could be those two caps on the inverter board that are causing the flickering.

      2) Check the DC voltages on the connector to the inverter board and see if they are stable or fluctuating.
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        • ravenor
          Member
          • Sep 2011
          • 27
          • USA
          #3
          Re: Princeton VL193 intermittent flicker

          How would I test the DC voltage? Sorry, I'm still pretty new to troubleshooting electronics.

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271
              #4
              Re: Princeton VL193 intermittent flicker

              Originally posted by ravenor
              How would I test the DC voltage?
              Do you have a multimeter? If yes, post a picture of it.
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                Comment

                • ravenor
                  Member
                  • Sep 2011
                  • 27
                  • USA
                  #5
                  Re: Princeton VL193 intermittent flicker

                  Yes I have one.
                  Attached Files

                    Comment

                    • retiredcaps
                      Badcaps Legend
                      • Apr 2010
                      • 9271
                      #6
                      Re: Princeton VL193 intermittent flicker

                      Originally posted by ravenor
                      Yes I have one.
                      Okay, one retiredcaps' bonus point for having a Fluke 83 III.

                      1) Set your Fluke 83 III to DC volts (2nd switch position - V with the solid line and dash line).

                      2) Plug in and power on your lcd. Hookup a working computer displaying your favourite wallpaper.

                      3) Put your black probe on a ground screw on the inverter board.

                      4) Put your red probe on each colored wire on connector CN1 on the inverter board.

                      5) Number each pin and report each DC voltage reading. See if the readings are stable or fluctuating during the flicker.

                      See my fellow Canadian Afrotechmods' excellent multimeter tutorial (5 minutes long)

                      http://www.youtube.com/watch?v=bF3OyQ3HwfU
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                        Comment

                        • retiredcaps
                          Badcaps Legend
                          • Apr 2010
                          • 9271
                          #7
                          Re: Princeton VL193 intermittent flicker

                          PS. If you ever think about selling your Fluke 83 III, send me a PM.
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                          Please do not post inline and offsite as they slow down the loading of pages.

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                            Comment

                            • retiredcaps
                              Badcaps Legend
                              • Apr 2010
                              • 9271
                              #8
                              Re: Princeton VL193 intermittent flicker

                              Post a picture of the logic/main board as well. Flickering could also be due to a bad voltage regulator on the logic/main board. Bad caps on the logic/main board is another possible cause.
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                                Comment

                                • ravenor
                                  Member
                                  • Sep 2011
                                  • 27
                                  • USA
                                  #9
                                  Re: Princeton VL193 intermittent flicker

                                  I have tested all the voltages and they are all stable(they changed by at most 0.01 volts). Here's the mainboard.
                                  Attached Files

                                    Comment

                                    • ravenor
                                      Member
                                      • Sep 2011
                                      • 27
                                      • USA
                                      #10
                                      Re: Princeton VL193 intermittent flicker

                                      Originally posted by retiredcaps
                                      PS. If you ever think about selling your Fluke 83 III, send me a PM.
                                      Thanks for the offer but I don't think I'll be selling it soon.

                                        Comment

                                        • retiredcaps
                                          Badcaps Legend
                                          • Apr 2010
                                          • 9271
                                          #11
                                          Re: Princeton VL193 intermittent flicker

                                          Originally posted by ravenor
                                          Here's the mainboard.
                                          I circled what I think are 3 voltage regulators.

                                          1) Plug in lcd and power on. Hookup a working computer again. Put your Fluke 83 III into DC voltage.

                                          2) Put your black probe on a ground screw on the main board.

                                          3) Put your red probe on each pin of each component except for the top tab.

                                          4) List the part number of each component and its DC voltage reading for each pin.

                                          5) Report findings like so

                                          IC100
                                          part number = 7805
                                          pin 1 = 0.0V
                                          pin 2 = 5.0V
                                          etc

                                          6) Try to take this readings while the monitor is flickering.
                                          Attached Files
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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

                                            • ravenor
                                              Member
                                              • Sep 2011
                                              • 27
                                              • USA
                                              #12
                                              Re: Princeton VL193 intermittent flicker

                                              I think I've solved the problem for now. It turns out that the refresh rate was set to 75Hz, after I changed it to 60Hz, the problem went away.

                                                Comment

                                                • retiredcaps
                                                  Badcaps Legend
                                                  • Apr 2010
                                                  • 9271
                                                  #13
                                                  Re: Princeton VL193 intermittent flicker

                                                  Originally posted by ravenor
                                                  I think I've solved the problem for now. It turns out that the refresh rate was set to 75Hz, after I changed it to 60Hz, the problem went away.
                                                  I setup my Windows only to show supported refresh rates.
                                                  --- begin sig file ---

                                                  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.

                                                  --- end sig file ---

                                                    Comment

                                                    • ravenor
                                                      Member
                                                      • Sep 2011
                                                      • 27
                                                      • USA
                                                      #14
                                                      Re: Princeton VL193 intermittent flicker

                                                      Same here, and 75Hz was supported but it still caused the problem.

                                                        Comment

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