Gateway FPD2185w Reviseted!

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  • DivanteBlack
    Member
    • Feb 2011
    • 33

    #1

    Gateway FPD2185w Reviseted!

    Ok so I am back to trying to fix this gateway monitor that carries a infamously bad repair rep. Lets see if some of the intelligent minds here can help me put the pieces together.

    Symptoms(objective): Plugging into the wall, led light shines blue
    Led light shinning>plug in vga from pc native>no picture
    Unplug vga from monitor> no "no signal" sign
    Press Power Button (i.e. LED Button)>no response/does not turn off
    Plug vga back in and shine flashlight into lcd> no picture
    Force turn off by unplugging power manually

    Diagnosis:
    Well the Power Supply / inverter board does not seem completely bad, atleast the power supply part doesn't, this being concluded y the fact that it turns on.

    The Main Board on the other hand may be experiencing some difficulties as for the fact that there is no viewable picture regardless of backlight.

    Obviously the backlights are not on, so there's a clue, possible inverter problem?

    What Iv done to the Board Already:
    I have replaced all the filter capacitors on the motherboard, and changed out the i guess filter caps on the main board ( note I changed the main board caps with some presumably working saxmons, by wich I mean they looked ok, from another monitor I replaced all caps on)

    This did not change the symptoms so I was advised to check the voltage regulators on the main board and the all read within their ranges 3.3 and 1.8. I also measured the output voltage off the power board and the all put out there proper voltages, 12.0 and 5.1, although the other leads that are anyied "BL","N/F" and "CNTRL" i have no idea what they do or how to measure them.

    I also took a look at the logic board on the back of the LCD Screen and tested a the only fuse I could find labeled F1and it tested fine, though I dont think the logic board is a problem because the symptoms are the same with screen or no screen, I might as well mention to be sure.

    So now Im back to the Power/Inverter Board, and I believe the problem resides in the inverter section for this board. Im not sure but I believe that some of the cffl transformers may be bad, or possibly the transistors for the inverter section but I am not skilled enough to know how to test these or Identify them specifically. I will post all the pictures and data I have collected about this monitor in this post, thanks ahead of time.

    Note please give any advice, even irelivent, I probably overlooked something!
    Attached Files
  • retiredcaps
    Badcaps Legend
    • Apr 2010
    • 9271

    #2
    Re: Gateway FPD2185w Reviseted!

    Originally posted by DivanteBlack
    I was advised to check the voltage regulators on the main board and the all read within their ranges 3.3 and 1.8.
    I count 4 voltage regulators. Did you test all 4?

    It also like there is one voltage regulator on the USB board. Is that one okay?
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    Comment

    • DivanteBlack
      Member
      • Feb 2011
      • 33

      #3
      Re: Gateway FPD2185w Reviseted!

      Yes the four voltage regulators on the main board are working correctly and so is the usb hub regulator.

      Comment

      • retiredcaps
        Badcaps Legend
        • Apr 2010
        • 9271

        #4
        Re: Gateway FPD2185w Reviseted!

        BTW, it would be a lot easier to follow if you would have kept this in the original thread that you started. We help a lot of people and it is easy to lose track of things. I suggest you ask the moderator to move this to your original thread.
        --- 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

        • DivanteBlack
          Member
          • Feb 2011
          • 33

          #5
          Re: Gateway FPD2185w Reviseted!

          I thought about it, but the other thread is 3 pages long, and I like most others dont want to read 3 pages just to find out im still at ground zero.

          But if anyone has any info, or a thread, on how to test mosfets or inverter transformers it would be greatly appreciated.

          Comment

          • Rtech
            Badcaps Legend
            • Jul 2010
            • 1095

            #6
            Re: Gateway FPD2185w Reviseted!

            Try this for Mosfet testing:-

            http://www.4qdtec.com/mostest.html

            Comment

            • DivanteBlack
              Member
              • Feb 2011
              • 33

              #7
              Re: Gateway FPD2185w Reviseted!

              Thanks,

              and by the way I did some testing of IC101 (200a6.pdf) and when I measure pin 6 i believe the Vcc pin I get around 10v, now if I read the data sheet right for this IC then I have to get aboive 11 or 12 for it to turn on other systems, is this correct?

              Comment

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