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FPD1760 700g

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    #1

    FPD1760 700g

    Damn you guys never cease to amaze me.

    This time I got a Gateway FPD1760.

    Here is a video of the problem h++p://rapidshare.com/files/442490017/100_0103.MOV, although it is hard to see in the video so here is the explanation:
    The picture is shaky and fuzzy an unstable. Turning the refresh rate up makes the problem worse. It does NOT happen to the OSD or menu built into the display. So its definately the incoming signal, but the same computer and cable works fine on three other monitors.

    Its probably a power supply issue as noted by other threads with the same monitor or similar (900g).

    What I need help with is disassembly. Does anyone have a service manual or any tips. I tried for about 15 minutes and got nowhere. It feels like the plastic bezel is going to break if I pry any harder.

    Thanks in advance.

    -merkin
    Last edited by merkin; 01-14-2011, 01:44 AM.
    Tags: None
    #2
    Re: FPD1760 700g

    Hard to help with disassembly without any good pictures of the monitor itself. Take a few good pics front and back of the monitor if its hard to open and I'm sure someone could give some hints. Many times it helps to remove what you can, for instance screws might be hiding behind the foot, behind rubber pads or under stickers. Once you get into it, get some good pics of the boards if you need help with identifying the problem itself. My guess is that you're right, that some kind of filtering doesn't quite work, or some kind of grounding problem.

    Comment

      #3
      Re: FPD1760 700g

      IIRC, this model is what I describe as a 'front loader'. What you do is separate the two halfs of the bezel enough to slide a thin piece of plastic between them, then work your way around the case with another. Be very careful around the button area.

      What kind of plastic? I prefer guitar picks, others use old credit cards, even a thin bladed screwdriver (or two) will work.

      This monitor, is notorious for bad caps. Replace ALL of them in the power supply. You may have to replace those on the signal card (logic card) too.

      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

        #4
        Re: FPD1760 700g

        Well I had better luck in round 2, but lost a few plastic tabs. oh well.

        Here are pics


        Uploaded with *************


        Uploaded with *************

        No visible signs or bad smells.
        The 'lytic cluster in the top right of the PSU are
        x3 KZE 10v 1000uf
        x1 KZE 16v 330uf
        x1 ELITE 50v 1uf
        The two on the DC side of each Transformer for CCFL are
        KY 25v 220uf

        The three on the top right of video board are
        x2 ELITE 25v 220uf
        x1 ELITE 16v 220uf

        Should I change every capacitor or just the bigger 'lytics with vents?

        I have a FLUKE 87V for measuring.

        Thanks

        Comment

          #5
          Re: FPD1760 700g

          Originally posted by PlainBill View Post
          What kind of plastic? I prefer guitar picks
          That's what I use. They leave no marks on the units
          There are 10 kind of people in this world: those that understand binary, and those who don't.
          • ASUS ROG Maximus IX Code
          • Intel Core i5-7600K 3.8GHz
          • 16gb GSKILL TridentZ RGB DDR4-3200
          • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
          • Windows 10 Pro x64
          • GeForce GT1050
            2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

          Comment

            #6
            Re: FPD1760 700g

            Originally posted by merkin View Post
            Here are pics
            Please follow the instructional links in PlainBill's signature to post pictures. Please do not post pictures inline.
            --- 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

              #7
              Re: FPD1760 700g

              Originally posted by retiredcaps View Post
              Please follow the instructional links in PlainBill's signature to post pictures. Please do not post pictures inline.
              fixed here.

              Also reupped video h++p://www.mediafire.com/?f68bcwum9d4kjzn

              Again if anyone can help the problem is the pixels are not stable. They dance around, looks like an interference issue.

              I originally blamed the PSU, but I powered up the video board with seperate power (I kept the CCFL's powered with the original power supply) (the 10-pin header has (x2)12v (x2)5v (x4)gnd Von/off and Vadj), but still have the same issue.

              So by process of elimination, it is either the video board or
              the CCFL connections from the original PSU.

              Could it be the CCFL's or the frequency? I can measure Hz setting on the multimeter like here http://www.fonerbooks.com/test.htm. What is ideal number for this screen???

              If I start replacing caps on the video board should I replace all caps, just the 'lytics, or just the 'lytics with vents?

              Please help.
              Attached Files

              Comment

                #8
                Re: FPD1760 700g

                Originally posted by merkin View Post
                fixed here.

                Also reupped video h++p://www.mediafire.com/?f68bcwum9d4kjzn

                Again if anyone can help the problem is the pixels are not stable. They dance around, looks like an interference issue.

                I originally blamed the PSU, but I powered up the video board with seperate power (I kept the CCFL's powered with the original power supply) (the 10-pin header has (x2)12v (x2)5v (x4)gnd Von/off and Vadj), but still have the same issue.

                So by process of elimination, it is either the video board or
                the CCFL connections from the original PSU.

                Could it be the CCFL's or the frequency? I can measure Hz setting on the multimeter like here http://www.fonerbooks.com/test.htm. What is ideal number for this screen???

                If I start replacing caps on the video board should I replace all caps, just the 'lytics, or just the 'lytics with vents?

                Please help.

                I would start by measuring the output voltage of the voltage regulators located on the lower left side of your board. I believe these are the two 3-pin devices with their upper tab soldered directly to the logic board. With respect to ground, measure voltages of all 3-pins and supply part numbers for each device.

                If the output voltages are good, then I would start replacing the larger caps values first.

                Comment

                  #9
                  Re: FPD1760 700g

                  Originally posted by jetadm123 View Post
                  I would start by measuring the output voltage of the voltage regulators located on the lower left side of your board. I believe these are the two 3-pin devices with their upper tab soldered directly to the logic board. With respect to ground, measure voltages of all 3-pins and supply part numbers for each device.

                  If the output voltages are good, then I would start replacing the larger caps values first.
                  Cant find datasheets, but the part numbers are enough.

                  Closest to the DVI port and from left to right we have...
                  "5DGL
                  17-18L"
                  1. 4.955vdc
                  2. 1.800vdc (also tab)
                  3. gnd

                  "5FSL
                  17-33L"
                  1. 5.214vdc
                  2. 3.295vdc (also tab)
                  3. gnd

                  The cluster of 'lytics by the regulators are G-LUXON
                  2x 16v 100uf
                  7x 16v 10uf

                  The three vented ones are ELITE
                  2x 25v 220uf
                  1x 16v 220uf

                  I am stumped.

                  Should I Connect some powered laptop lcd inverters to power the CCFL's to completely rule out the PSU?
                  The pixels do become even more active as the monitor "warms up".

                  Or can I narrow it down to the the i/o ot the video chip (TSU56AK), but I cant find a datasheet for that either.
                  Also I have yet to mention the problem happens on both digital and analog inputs.

                  Thanks for the help ;-)
                  Last edited by merkin; 01-29-2011, 12:50 AM.

                  Comment

                    #10
                    Re: FPD1760 700g

                    Originally posted by merkin View Post
                    Cant find datasheets, but the part numbers are enough.

                    Closest to the DVI port and from left to right we have...
                    "5DGL
                    17-18L"
                    1. 4.955vdc
                    2. 1.800vdc (also tab)
                    3. gnd

                    "5FSL
                    17-33L"
                    1. 5.214vdc
                    2. 3.295vdc (also tab)
                    3. gnd

                    The cluster of 'lytics by the regulators are G-LUXON
                    2x 16v 100uf
                    7x 16v 10uf

                    The three vented ones are ELITE
                    2x 25v 220uf
                    1x 16v 220uf

                    I am stumped.

                    Should I Connect some powered laptop lcd inverters to power the CCFL's to completely rule out the PSU?
                    The pixels do become even more active as the monitor "warms up".

                    Or can I narrow it down to the the i/o ot the video chip (TSU56AK), but I cant find a datasheet for that either.
                    Also I have yet to mention the problem happens on both digital and analog inputs.

                    Thanks for the help ;-)

                    The 3.3V and 1.8V outputs look good. Since you tried powering up the logic board using different power sources with the same results and unless you're power supply output voltages are fluctuating, too low or high, it looks like you isolated the problem to the logic board.

                    Because of the logic board's smaller footprint, the manufacturer has to use physically smaller caps. This involves cramming a large cap value into a small can, which can dry out more quickly. Luxon and Elite have poor records and I would first try replacing the 220's followed by the 100's. Of course, it's your choice.

                    Also, I agree with PlainBill that the power supply onthis model is notorius for bad caps. Even if the output voltages check good, consider replacing all the smaller caps,except for the large 450V one.
                    Last edited by jetadm123; 01-29-2011, 09:12 AM.

                    Comment

                      #11
                      Re: FPD1760 700g

                      Originally posted by jetadm123
                      .... unless you're power supply output voltages are fluctuating, too low or high, it looks like you isolated the problem to the logic board.
                      Since the board needed +12 and+5 volts I thought it would be a no brainer to use a PC PSU.

                      Originally posted by jetadm123
                      ... I would first try replacing the 220's followed by the 100's. Of course, it's your choice.
                      I am in debt to you. what is you paypal? ill buy ya a beer-cheers

                      Replaced all the polarized caps on the video board and everything works!!!

                      I tested each one with my capacitance meter.
                      3 of the 7 16v 10uf were reading less than 7uf and the other four were between 8-9uf. one of them were completely open.

                      the 100uf's were reading around 80uf

                      the rest were reading fine, but this was just capacitance not ESR.

                      Again thanks jetadm123 for some direction.

                      Comment

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