Dell LCD 1905FP Problem

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  • abbas101
    Member
    • Feb 2011
    • 49
    • Pakistan

    #1

    Dell LCD 1905FP Problem

    My LCD Monitor 1905FP display is getting pink fluctuating band from its left side and display loose its sharpness. All other controls are working perfectly. I change VGA cable, CPU and I am sure it is from inside the monitor. I also perform factory reset. Following pics may explain the problem. Please advice.
    Attached Files
  • Ritalin
    Senior Member
    • Sep 2010
    • 194

    #2
    Re: Dell LCD 1905FP Problem

    I would have said that it's a backlight issue cause the pinkish hue is a sign of it, but I thought it usually affects the whole screen and not just a section like that. How long has it been like that?

    Comment

    • jetadm123
      Badcaps Legend
      • Feb 2010
      • 2169

      #3
      Re: Dell LCD 1905FP Problem

      It's probably time to take it apart. I don't think pressing any buttons on the front will clear that pink color problem. Please post some good clear foscused photos of the entire power board top and bottom. Also, a photo of the logic board would be good. Do not post photos inline, but use the "manage attachments" button.

      Comment

      • Scenic
        o.O
        • Sep 2007
        • 2642
        • Germany

        #4
        Re: Dell LCD 1905FP Problem

        at least i'm not the only one with total chaos on the desktop

        this looks like either bad caps on the lcd controller board or a flaky connection of the LVDS cable (the one going from the LCD controller board to the panel)

        Comment

        • abbas101
          Member
          • Feb 2011
          • 49
          • Pakistan

          #5
          Re: Dell LCD 1905FP Problem

          Originally posted by Ritalin
          I would have said that it's a backlight issue cause the pinkish hue is a sign of it, but I thought it usually affects the whole screen and not just a section like that. How long has it been like that?

          It is over one week

          Comment

          • abbas101
            Member
            • Feb 2011
            • 49
            • Pakistan

            #6
            Re: Dell LCD 1905FP Problem

            Originally posted by jetadm123
            It's probably time to take it apart. I don't think pressing any buttons on the front will clear that pink color problem. Please post some good clear foscused photos of the entire power board top and bottom. Also, a photo of the logic board would be good. Do not post photos inline, but use the "manage attachments" button.
            I will post pictures in a day time. Thanks

            Comment

            • abbas101
              Member
              • Feb 2011
              • 49
              • Pakistan

              #7
              Re: Dell LCD 1905FP Problem

              Originally posted by jetadm123
              It's probably time to take it apart. I don't think pressing any buttons on the front will clear that pink color problem. Please post some good clear foscused photos of the entire power board top and bottom. Also, a photo of the logic board would be good. Do not post photos inline, but use the "manage attachments" button.
              I am including pics. On visual inspection I didnt notice any burn out component or suspicious capacitor. There was some dust and dirt accumulated which I cleaned. What should be my next step?
              Attached Files

              Comment

              • abbas101
                Member
                • Feb 2011
                • 49
                • Pakistan

                #8
                Re: Dell LCD 1905FP Problem

                Originally posted by Scenic
                at least i'm not the only one with total chaos on the desktop

                this looks like either bad caps on the lcd controller board or a flaky connection of the LVDS cable (the one going from the LCD controller board to the panel)
                I have posted few pics. There are hundred of tiny components on controller board. Is it possible to check these components on board without removing them. Sharing of your experience will be highly appreciated.

                Comment

                • Th3_uN1Qu3
                  Believe in
                  • Jul 2010
                  • 6031
                  • Romania

                  #9
                  Re: Dell LCD 1905FP Problem

                  Clean all connectors with isopropyl alcohol (be careful not to spill it onto the panel!) and see if it still does it. That looks like a bad connection between display cable and panel OR it could be a problem with the panel electronics. If it's the panel it's not fixable.
                  Originally posted by PeteS in CA
                  Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                  A working TV? How boring!

                  Comment

                  • retiredcaps
                    Badcaps Legend
                    • Apr 2010
                    • 9271

                    #10
                    Re: Dell LCD 1905FP Problem

                    1) The bad news. There are tons of Capxon caps on both the power and logic board. Capxon has less than a steller reputation here.

                    Capacitors die from age, heat, and shoddy build quality. Capacitors DO NOT have to be visibly bloated in order to bad. They can be out of tolerance uF (a 1000uF measures 20uF) and/or have high ESR (ohm). A multimeter will be insufficient to test for ESR. For that you need an ESR tester which costs between $50 and $300.

                    Most members here will recommend that you replace ALL capacitors with reputable brands from reputable sellers. Brands like Rubycon, Panasonic, and United Chemicon are suggested. A list of recommended caps can be found at

                    https://www.badcaps.net/forum/showthread.php?t=2280

                    The cost of replacing all the Capxons is something for you to decide. No guarantees that the caps are causing the problem as it may be the panel.

                    However, before you replace them, you can do the following tests below.

                    2) If you have a multimeter, measure the voltage regulator I200 on the logic board. It is a 3.3V regulator so the output pin should be 3.3V.

                    3) Measure I313. It looks like a 18 type of part number? Look at the part number and find the datasheet. Then test for DC voltage and compare it to the datasheet.

                    4) On the connector from the power board to the logic board, measure and list the DC voltages on all the pins. Note if the voltages are steady or fluctuating.
                    --- 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

                    • gregory_dubb
                      New Member
                      • Feb 2011
                      • 1

                      #11
                      Re: Dell LCD 1905FP Problem

                      Well, it's not backlight problem for sure. Is it temperature or time related? If not, then it's definitely video processing problem either within video card or main pcb, not the T-con.

                      Comment

                      • jetadm123
                        Badcaps Legend
                        • Feb 2010
                        • 2169

                        #12
                        Re: Dell LCD 1905FP Problem

                        Nice photos! Posts #9 and #10 are good ideas. Also, have you verified that the video cable connecting your monitor to your computer is good?

                        Comment

                        • abbas101
                          Member
                          • Feb 2011
                          • 49
                          • Pakistan

                          #13
                          Re: Dell LCD 1905FP Problem

                          Originally posted by jetadm123
                          Nice photos! Posts #9 and #10 are good ideas. Also, have you verified that the video cable connecting your monitor to your computer is good?
                          Yes. I check cable. It was ok.

                          Comment

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