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    Gateway FPD2185W not showing display

    So I have a monitor that I bought of ebay that was claimed working but really wasn't. I ordered a complete set of caps and changed out the 470uf 25v's but I haven't replaced the ones on the vga board becase they look good. In fact all the caps look good before I changed out the caps, and I tested after the 8 changed out and still same result.
    I can power it on and off. It powers on and if connected will register with computer and stay blue, but if not connected it will turn amber in sleep mode. The Gateway logo power on and I can see the backlight in the background on the lcd. I was thinking it was a cap issue like the other monitor that I had (exactly the same), but thoses caps obviously showed signs of failure. These (left over on vga board) however do not show any signs of failure and the symtoms are a little different. My other monitor would not allow me to turn it off and this one does.
    So I guess what I need to do is use my meter and check the post. I have a Fluke 1000 and it's automatic so I think I just need to set to Auto DC, but I am wanting some assistance where to test and what I should expect.
    This is my first post in this forum and I am sure there is more you will want from me so I will stop here to allow for a better accumilation of the facts for you guys to help diagnois.
    Attached Files

    #2
    Re: Gateway FPD2185W not showing display

    Originally posted by yashua View Post
    So I have a monitor that I bought of ebay that was claimed working but really wasn't.
    Did you complain and try to get a refund?

    The Gateway logo power on and I can see the backlight in the background on the lcd.
    I'm not sure I understand the problem 100% even after reading it three times?

    1) Do you have a white screen then with the backlight on?

    2) Does your favourite wallpaper appear?

    I have a Fluke 1000 and it's automatic so I think I just need to set to Auto DC, but I am wanting some assistance where to test and what I should expect.
    Is it this one?

    http://www.fluke.com/fluke/usen/elec...ck=t5-1000-kit
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    Comment


      #3
      Re: Gateway FPD2185W not showing display

      So Yes I complained and got all my money back and I get to try and fix it now!

      Yea sorry about that I read it again and I see where your confused. I should of said it turns on and then turns off.
      1)No white screen just Gateway logo
      2)My Desktop shows up once and dissapears

      Corrct that is the meter I have.

      I think it's my ccfl bulbs and I am taking apart the screen now... I will update with new pics soon.

      Comment


        #4
        Re: Gateway FPD2185W not showing display

        Originally posted by yashua View Post
        1)No white screen just Gateway logo
        2)My Desktop shows up once and dissapears
        Disappears as in
        - backlights on, but black screen or
        - backlights go out, picture visible with a flashlight (try playing a video file and see if anything moves on the screen with the flashlight)

        If it's the latter, it's probably "2 seconds to black"

        Comment


          #5
          Re: Gateway FPD2185W not showing display

          Originally posted by yashua View Post
          So Yes I complained and got all my money back and I get to try and fix it now!
          Good for you. If it was advertised as working, then it should work. Now it is possible that the seller was telling the truth, but shipping and handling damaged the ccfls? See below.

          Yea sorry about that I read it again and I see where your confused. I should of said it turns on and then turns off.

          I think it's my ccfl bulbs and I am taking apart the screen now..
          It sounds like you have the classic 2 seconds to black. The cause can be, in no particular order,

          a) bad caps
          b) bad inverter transformer secondary windings
          c) bad ccfl
          d) bad ccfl wiring (especially the top thinner return wire)

          You eliminated bad caps with new Panasonic caps. The remainder are described in detail in posts #19 and #20 at

          https://www.badcaps.net/forum/showthread.php?t=10419

          edit: Scenic beat me to it. I know PlainBill is sleeping at 12:47am which is where I'm headed for now as well.
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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.

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          Comment


            #6
            Re: Gateway FPD2185W not showing display

            Getting the lamps assemblies is not easy job, be real careful if you are really going to take the panel apart.
            Check the MOSFET's on the bottom of the board?
            http://s807.photobucket.com/albums/y...way%20FPD2185/

            http://s807.photobucket.com/albums/y...klight%20lamp/

            Did you also replace the two vcc sub filter caps in the inverter section beside the all the one in the power supply section?
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment


              #7
              Re: Gateway FPD2185W not showing display

              Hmm... well I actually didn't find it all that hard to get to the bulbs, but I have been taking apart things for a long time. I guess you could say disassembaly is my expertise.
              I included the pictures of the bulbs... It looks like the bottom bulbs have 1 burnt and the other 2 look okay along with the other set of 3. Okay I know I might have jumped too far ahea of myself, but one thing that I rely on is visual information and some screws and tabs don't really hold me back.

              I guess now that I have the bulbs out I am wondering the best way to test the bulbs, but before that I have some questions?

              1) What are the steps you recommend to test my monitor (the screen is apart now, but I should be able to test the board without it correct?)

              2) There is a monitor on ebay that is selling backlights cause the monitor is scratched for $20 should I just buy it?

              3) If it is the bulbs it looks (visually) like just one... I am pretty good with my hands and was wondering if I could just replace that one single bulb and where could I get it?

              Here is the monitor on ebay
              http://www.ebay.com/itm/LTM210M2-L02...item256a83b336
              Edit- So I found the ccfl bulbs and there around 14 a piece... I wish I could check each bulb individually. Can anyone help with steering me toward how to power and convert just a single bulb and test it?
              Attached Files
              Last edited by yashua; 03-02-2012, 03:19 AM.

              Comment


                #8
                Re: Gateway FPD2185W not showing display

                Originally posted by Scenic View Post
                Disappears as in
                1 backlights on, but black screen or
                2 backlights go out, picture visible with a flashlight (try playing a video file and see if anything moves on the screen with the flashlight)
                This is funny
                1) with backlights on there wouldn't be a black screen
                1)if the backlights were to go out that doesn't mean there not on... there just not working.

                Let me simplify this - Monitor on - Lamps on (1 sec) - screen turns off (not black)... hope that helps scenic
                Last edited by yashua; 03-02-2012, 03:21 AM.

                Comment


                  #9
                  Re: Gateway FPD2185W not showing display

                  What I would do next is to hook up the lamps back into the inverter board, you can leave out the LDVS cable to the screen, turn it on and see which tube does not light up. I have a set of test lamps that I saved from broken screen to test the inverter function to find out if it is the lamp problem or the inverter problem. So try looking at the lamp first, if you see one lamp does not not come on, then swap the lamp connection, if the same lamp still does not come on, then you know itis bad lamp, if it comes on then you have inverter problem. If you look through my albums, you will see how I go abot testing the inverter and the lamp.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment


                    #10
                    Re: Gateway FPD2185W not showing display

                    When I have too, I get the lamp from WWW.LCDPARTS.NET. The one with blackened end
                    does not look good but you will see if it will light up or not.
                    Pictures of bad lamp/lamp wiring.
                    http://s807.photobucket.com/albums/y...klight%20lamp/
                    Most of the new screen they taped down the lamp assembly to the panel asy, old panel design they have screw that holds the lamp assembly that you can just slide it out.
                    Never stop learning
                    Basic LCD TV and Monitor troubleshooting guides.
                    http://www.badcaps.net/forum/showthr...956#post305956

                    Voltage Regulator (LDO) testing:
                    http://www.badcaps.net/forum/showthr...999#post300999

                    Inverter testing using old CFL:
                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                    http://s807.photobucket.com/user/budm/library/

                    TV Factory reset codes listing:
                    http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment


                      #11
                      Re: Gateway FPD2185W not showing display

                      Well as I did what you said I also looked clser at the connections on the board... 1 of the pins were bent you can see in picture.
                      I bent it back carefully and plugged the lights in. When I turn it on they all light up halfway... but then one second stopped them from trying to continually light. I swithced them back and forth and I get same results but with humming when I plug only one in (Not sure why but didn't see it as immediate danger)
                      I guess now that I fixed that pin I am wondering if I should put it all back together or should I try and plug lcd in and see if it turns on and stays on?

                      More troubleshooting?

                      I am still hoping to just do some volt readings to help determine if the bulbs are bad or te voltages are too high... thou I will differ to this forums expertise.
                      Attached Files

                      Comment


                        #12
                        Re: Gateway FPD2185W not showing display

                        Do not run the inverter without the load (lamps), the firing voltage is about 1500~2000v and then when the lamps are lit, it will drop down to about 500~800v. The inverter circuits has detection circuits that if the lamp does not fireup (or open connection) within a preset time, it will shutdown the circuit otherwise it will start arcing and cause damages, it also has the over current detection if the lamp draws too much current, it will go into shutdown.
                        Now you say that the lamps light halfway up (the tubes are not fully glow), it means that the drive voltage is too low to ionize the lamp properly. It can be due to low DC voltage feeding the inverter circuits sice the power supply is common to both inverter circuits, or one of the inverter circuits is loding down the power supply. Let me think back on the one I worked on to find out where else to look at.
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment


                          #13
                          Re: Gateway FPD2185W not showing display

                          By the way, did you check those 4 MOSFET's on the bottom side of the board? They are for driving the inverter transformers.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment


                            #14
                            Re: Gateway FPD2185W not showing display

                            I see that you did not change the two 220uf/25v caps in the inverter section. by the way leave the lamps outside for now until the problems are fixed so you easily how the lamps are working.
                            Never stop learning
                            Basic LCD TV and Monitor troubleshooting guides.
                            http://www.badcaps.net/forum/showthr...956#post305956

                            Voltage Regulator (LDO) testing:
                            http://www.badcaps.net/forum/showthr...999#post300999

                            Inverter testing using old CFL:
                            http://www.badcaps.net/forum/showthr...er+testing+cfl

                            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                            http://s807.photobucket.com/user/budm/library/

                            TV Factory reset codes listing:
                            http://www.badcaps.net/forum/showthread.php?t=24809

                            Comment


                              #15
                              Re: Gateway FPD2185W not showing display

                              Yes I did change out those 2 220uf caps and I am not quite sure how to check the mosfets... and where they are? could you highlight and tell me how to check and what to expect?

                              Comment


                                #16
                                Re: Gateway FPD2185W not showing display

                                Originally posted by budm View Post
                                Do not run the inverter without the load (lamps), the firing voltage is about 1500~2000v and then when the lamps are lit, it will drop down to about 500~800v. The inverter circuits has detection circuits that if the lamp does not fireup (or open connection) within a preset time, it will shutdown the circuit otherwise it will start arcing and cause damages, it also has the over current detection if the lamp draws too much current, it will go into shutdown.
                                Now you say that the lamps light halfway up (the tubes are not fully glow), it means that the drive voltage is too low to ionize the lamp properly. It can be due to low DC voltage feeding the inverter circuits sice the power supply is common to both inverter circuits, or one of the inverter circuits is loding down the power supply. Let me think back on the one I worked on to find out where else to look at.
                                Can you explain the inveter? is that the part soldered onto the power board where I connect the lamps?

                                Comment


                                  #17
                                  Re: Gateway FPD2185W not showing display

                                  Originally posted by budm View Post
                                  If you look through my albums, you will see how I go abot testing the inverter and the lamp.
                                  Sorry but your alumbs are a little confusing with no descriptions. I have tried looking through them but in this case 1,000 words is worth 1,000 words... better than a pic (for my braind that is)
                                  Thanks Thou!

                                  Comment


                                    #18
                                    Re: Gateway FPD2185W not showing display

                                    Originally posted by yashua View Post
                                    Can you explain the inveter? is that the part soldered onto the power board where I connect the lamps?
                                    If you look at the first picture, there is a large white arrow just below the center of the power supply. Everything to the right of the board (and the corresponding area on the top) is the inverter.

                                    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


                                      #19
                                      Re: Gateway FPD2185W not showing display

                                      okay thanks bill that explains it. In my head that is the power supply board... (one board) so that was my confusion. those 4 mosfet how would I go about testing those?

                                      Comment


                                        #20
                                        Re: Gateway FPD2185W not showing display

                                        Originally posted by yashua View Post
                                        Yes I did change out those 2 220uf caps and I am not quite sure how to check the mosfets... and where they are? could you highlight and tell me how to check and what to expect?
                                        On the backside are 4 mosfets. I can only make out one part number which is U304. The other 3 look like U304.

                                        Testing a mosfet procedure at

                                        https://www.badcaps.net/forum/showpo...4&postcount=19
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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.

                                        --- end sig file ---

                                        Comment

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