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Hanns-G HG281D, LCD Monitor no power

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    Re: Hanns-G HG281D, LCD Monitor no power

    Big thanks to all on this topic. I had a big dead monitor and replaced:

    -- c603
    -- c606
    -- c707
    -- c406
    -- c605
    -- c108
    -- c111
    -- c114

    and all is well once again.

    Comment


      Re: Hanns-G HG281D, LCD Monitor no power

      Make sure to replace the caps (c80, c83) on the main board also.
      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


        Re: Hanns-G HG281D, LCD Monitor no power

        Originally posted by budm View Post
        Make sure to replace the caps (c80, c83) on the main board also.
        Ahhh - good to know. I may have spoken too soon - if I'm really close to the monitor, I can see flickering pixels/areas. The flickering is a definite pattern - vertical columns which repeat across the screen - very faint and only noticeable on certain colored backgrounds (can't see it on black background for instance).

        Would replacing c80, c83 help the flicker problem?

        Comment


          Re: Hanns-G HG281D, LCD Monitor no power

          More likely.
          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


            Re: Hanns-G HG281D, LCD Monitor no power

            Hey all, long-time reader, first time poster. It looks like I have the same issue as ngstime, page 23. Funny thing is I thought it was the power at first, so I disassembled to look at the caps. I must have the super power supply. It doesn't match anything found in this forum, as half of my caps are coded CS instead of C, and none of the numbers match. The caps seem of higher quality than most of the bads ones being replaced. So I'm hoping and praying that it's just the two caps C80 and C83 on the mainboard causing my intermittent black screen. Thank you all for keeping this forum going. This monitor has a bit of nostalgic value, having had it for nearly 5 years now. I hope I can keep it from croaking, wish me luck.

            -Marshall

            Comment


              Re: Hanns-G HG281D, LCD Monitor no power

              Bummer, I should have checked the link first. The digikey link for C80 and C83 is no longer there. Can someone recommend a good high-quality replacement? A quick search of the forum doesn't list specific specs for those aside from voltage and capacitance. I don't think I have the skills to find a proper match.

              Comment


                Re: Hanns-G HG281D, LCD Monitor no power

                Use this one:
                http://www.digikey.com/product-searc...=0&pageSize=25
                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


                  Re: Hanns-G HG281D, LCD Monitor no power

                  Originally posted by budm View Post

                  Thank you Budm, much appreciated. I've only done cap repairs on video cards before, this will be my first monitor. Wish me luck.

                  Comment


                    Re: Hanns-G HG281D, LCD Monitor no power

                    So i have the same monitor, and had similar problems.
                    A cleaning of the PSU of the brown flux made the psu outputs back to spec
                    But my problem is now it will turn on and show my pc screen sometimes for up to 60 seconds, then go black. But the screen still has light just no pixels are lighting up, kinda a dim black.
                    the 12v line is about 11.85 under load
                    the 5v line is 5.05v under load
                    the 5sb is around 4.89V
                    the 24V line is 24.02V
                    When i put my scope on the lines under load they had a bit of noise nothing more than about 0.4V
                    But the 24V line had about 24.4 high to a low of 22.6V every 10ms
                    But again the screen CFLs are on just no image on screen.
                    Was testing only via the vga port.
                    Based on these finding im thinking maybe the psu is fine but the logic board is giving some sort of problem.
                    Also the computer still thinks the monitor is attached when the screen goes black.
                    Have yet to replace caps on the board and do not yet have a ESR metter.
                    Any ideas before i go and order caps?

                    Comment


                      Re: Hanns-G HG281D, LCD Monitor no power

                      Change the two caps on the main board, C80, 83, see link on post 507.
                      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


                        Re: Hanns-G HG281D, LCD Monitor no power

                        Okay thanks for that, replaced the two caps with some rubycon 100uf 35v caps and it works perfectly.
                        But i have a feeling im going to be replacing the rest of the caps within the next 6-8 months.
                        Also got an ESR metter on the way so i can test the caps better.

                        Comment


                          Re: Hanns-G HG281D, LCD Monitor no power

                          I made a mistake. I am replacing the caps on my HG281D power supply (Rev 2). Upon removing them, I cannot determine which cap values go at location cs18 and cs28. I know these two are 220 and 100 uf, but I don't know which is which. Would someone take a look and let me know? Thank you in advance. Larry

                          Comment


                            Re: Hanns-G HG281D, LCD Monitor no power

                            Found the answer, special thanks to Algomez on post 39! Thank you Thank you!!! Larry

                            Comment


                              Re: Hanns-G HG281D, LCD Monitor no power

                              Amazing! over 500 posts and you able to find the answer, great work.
                              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


                                Re: Hanns-G HG281D, LCD Monitor no power

                                Hi all

                                About 1 year ago (post #349) I had resolved the first trouble with my Hanns.G (screen going black for a second or 2 every once in a while) with the info in this monster-thread.
                                Now, 1 year later, the PSU of my monitor has started to act up making it more and more difficult to get the display to turn on.
                                And once again, with the info accumulated here, my monitor is running fine again. After replacing the 8 caps mentioned again and again (C603, C606, C707, C406, C605, C108, C111, C114) the monitor powers up without a hitch.

                                Thanks once more to everyone who contributed to this thread.

                                Lenny
                                Hanns.G HG281D, 14 years, still going strong.

                                Comment


                                  Re: Hanns-G HG281D, LCD Monitor no power

                                  Hi, just joined and have very limited electronics experience but am willing to have a go at fixing my HG281D.

                                  Basically one of my monitors took multiple attempts to switch on but once it was on it ran OK. As timed passed more attempts were needed and eventually I left it switched on permanently(to avoid hassle), then one day it just died. I'm guessing it might be something to do with the power supply and so have ended up on these boards.

                                  I've been trying to absorb this long thread and work out what to do next. From what I understand I need a ESR meter to check the capacitors on the power supply and when I find a dodgy one I replace it? My power supply seems to be the same model as user usbdevice, PSM217 404-H-R, Rev A1. Can anyone recommend where to source components in the UK? TIA

                                  Comment


                                    Re: Hanns-G HG281D, LCD Monitor no power

                                    post a pic of your PSU so we can see the caps

                                    Comment


                                      Re: Hanns-G HG281D, LCD Monitor no power

                                      Not sure if it's any good - don't have a decent camera :-
                                      Attached Files

                                      Comment


                                        Re: Hanns-G HG281D, LCD Monitor no power

                                        Do you have a DMM handy?

                                        Comment


                                          Re: Hanns-G HG281D, LCD Monitor no power

                                          Digital multimeter? Just dug one(quite old) out of my toolbox, what do you want me to try to do?

                                          Comment

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