Dell E177FPv - No video

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  • MEB
    Badcaps Veteran
    • Sep 2013
    • 371
    • USA
    #1

    Dell E177FPv - No video

    Hello. I realize this monitor is not worth the trouble, but I can't help it.
    I got 2 of these. After recapping both PS boards, 1 works fine, the other has no video.

    Using the working one as the donor, the second monitor works fine upon substituting the video board from the working monitor. So I pretty much know (assume) it is the video board. This is only an $8 board on ebay, but I'm looking to learn something if possible. The caps on the board appear fine and are not Elites or Cap-Xons, and attempting to check ESR with old "blue" and my DVM shows also good and not shorted. I am not able to locate a fuse. I have enclosed pictures of the video board in question. I am not sure where to begin.
    Attached Files
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Dell E177FPv - No video

      What dcV do you get on all 3 pins of U6, U7, Q5?
      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

        • MEB
          Badcaps Veteran
          • Sep 2013
          • 371
          • USA
          #3
          Re: Dell E177FPv - No video

          Thanks budm. It is always a pleasure.

          Attached are the voltages. I wasn't sure how else to list them without confusion. Am looking forward to your reply, but it is Illinois time and am off to a tractor pull at the fair, so see you tomorrow!
          Attached Files

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Dell E177FPv - No video

              The Voltages are OK.
              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

                • MEB
                  Badcaps Veteran
                  • Sep 2013
                  • 371
                  • USA
                  #5
                  Re: Dell E177FPv - No video

                  Back to business. Ready for more troubleshooting.
                  Attached Files

                    Comment

                    • MEB
                      Badcaps Veteran
                      • Sep 2013
                      • 371
                      • USA
                      #6
                      Re: Dell E177FPv - No video

                      budm, is there any more I can do?

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA
                          #7
                          Re: Dell E177FPv - No video

                          You will probably need to use the scope to see if there is any signals on the LVDS cables to the LCD panel, or the XTAL is active.
                          BTW, does it work if you try cooling or heating the board?
                          Last edited by budm; 07-28-2016, 10:17 AM.
                          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

                            • MEB
                              Badcaps Veteran
                              • Sep 2013
                              • 371
                              • USA
                              #8
                              Re: Dell E177FPv - No video

                              OK, went with the second suggestion first as I am not real efficient with a scope. I turned on the power, no video, heated board with heat gun as much as I thought I could get away with and no video after a few minutes. Powered it on/off a few times, still no video. Removed video board, wrapped in paper towel and put it inside a plastic bag and put in the freezer for an hour. Took it out and connected it to the rest, waited a minute or two for the moisture to disappear some and powered it up. Video came right on! But, now it won't fail even trying to heat the board with the heat gun again. I guess I will just leave it running and see what happens? Thanks for your help thus far.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA
                                  #9
                                  Re: Dell E177FPv - No video

                                  You can use canned air duster upside down for cooling, I wonder if it has bad EEPROM.
                                  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

                                    • MEB
                                      Badcaps Veteran
                                      • Sep 2013
                                      • 371
                                      • USA
                                      #10
                                      Re: Dell E177FPv - No video

                                      Thanks for the air duster info. I was kind of concerned about the frosty freezer board! It has been quite a few hours now and the darn thing is still working. I cycled power a few times and it keeps coming back with video. I will let it run overnight I guess and will try to read up on the eeprom as I don't know anything about those. It might be U1 on the board as 24LC02BT datasheet says it is an eeprom?

                                        Comment

                                        • MEB
                                          Badcaps Veteran
                                          • Sep 2013
                                          • 371
                                          • USA
                                          #11
                                          Re: Dell E177FPv - No video

                                          Well, the monitor ran fine overnight. Guess I will assemble it and see how long it lasts. Thanks for your help.

                                            Comment

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