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BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlight.

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    #1

    BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlight.

    I have a BenQ e2220HD monitor that turns on for 2-3 seconds but remains black after that. But I have seen some flickers of menu when I continually press the side buttons (brightness, menu, input, ect...). 1 or 2 flickers of menu change sometimes, not all the time. I have electrical experience and did a lot of research. BenQ apparently has a bad reputation for shorted transistors. C5707's that need to be checked, resoldered, or replaced. I am new to tv/monitor repairs but I would like to get this problem fixed. I can't tell which are the transistors. Pictures of ones I've seen of BenQ models do not look like what is on my board. The only ones that look like transistors all have heat sinks on them. I have taken the monitor apart to examine the boards and checked for cold joints or any visible bad components. Put it all back together with it working the same with the same problem. Before I jump into this I was wondering what is the best way to start. Being it BenQ I think the transistor issue. Can anyone point out to me where the transistors are? I have some pictures and a video of my monitor problem. Any other tips or starting points would be a great help thank you for your time.

    here is the video to the issue
    http://www.youtube.com/watch?v=QzT58tOmf-8
    Attached Files
    Tags: None
    #2
    Re: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

    Hi - Nice explanation. Can you post a picture of the back of the board - Try and get it to fill the frame but do not cut the edges off. As near to 2 mb as you can get without going over that.
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

      #3
      Re: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

      I hope this is good enough. If not, I can probably do better.
      Attached Files
      Last edited by DonXiong; 07-25-2012, 04:23 PM.

      Comment

        #4
        Re: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

        Did you replace the caps, or are they original? The capacitors look far too high quality to be found in a BenQ...
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

          #5
          Re: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

          2 seconds to black can be

          a) bad caps
          b) bad ccfls
          c) bad ccfl wiring (especially the return wiring)
          d) bad secondary windings on the inverter transformer

          More details starting with post #19 at

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

          Also, see budm's Inverter tester using old CFL

          https://www.badcaps.net/forum/showthread.php?t=19987

          What is part number for Q805 and Q806 on the back?
          --- 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

            #6
            Re: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

            Hi - this is a rare board? hardly any "hits" on google.

            I attach a picture - suggest you reflow the red joints - they dont look bad
            but just because its a Benq.
            One easy test is to check the secondary windings on the inverter transformer. They cant be open as it does flash and as there is only one we have nothing to check against. What is the part number on the transformer?
            perhaps we can find some data on it. Also what are the part numbers on the
            small 8 legged ic's on the back of the board.

            On the front, can you mark up a picture showing the part numbers of the Ics
            on the heatsinks - part numbers may help if you cant read it all.
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

              #7
              Re: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

              Originally posted by tom66 View Post
              Did you replace the caps, or are they original? The capacitors look far too high quality to be found in a BenQ...
              Nope have not replaced anything yet... Would like to spend less then $80 because the higher model of this monitor sells on craigslist here at that price. I just don't know where to start because I have not seen anyone mention these symptoms before.

              Comment

                #8
                Re: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

                Ignoring post #5 and #6 will likely not help your case.

                Double posting or starting yet another thread without even trying to do some homework as per post #5 and #6 will not get you any more help.

                https://www.badcaps.net/forum/showthread.php?t=22152
                Last edited by retiredcaps; 08-22-2012, 08:37 PM.
                --- 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

                  #9
                  Re: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

                  So are you getting 24VDC at the fuse on the inverter board? Can we see closed up picture of the label on the inverter board by the connector? It shows what the pins are for.
                  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: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

                    Disregard post9 and see attached pix.
                    Attached Files
                    Last edited by budm; 08-22-2012, 11:04 PM.
                    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: BenQ E2220HD 2-3 seconds to black, Power Light on, no picture when using Flashlig

                      Perhaps didnt help that I did not attach my pic to post 5
                      Attached Files
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment

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