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Apple Cinema Display 27" No TBolt - Buzzing and then dead

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    #21
    Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

    All I replaced were the caps and once all of the Taicon, you seem to have some variation on your board, all of my were Taicon.

    My replacements were all Rubycon due to the generally good feedback from users here.

    One of my current coworkers spent many years repairing electronics, I'll run the photos by him tomorrow if not one has responded and let you know if he thinks any look noticeably bloated.

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      #22
      Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

      Oh thank you so much! Greatly appreciated!

      Comment


        #23
        Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

        I have found some more clues. I managed to turn the PSU around and listen to it with an little tube when it was powered on. I found that most of the buzz was coming from these two orange components:

        http://imgur.com/a/2zxdJ#18

        http://imgur.com/a/2zxdJ#19

        The buzz is not at all as loud when I turn on the power without the LED screen plugged in but the buzzing is there.

        Hope this helps in some way!

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          #24
          Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

          They Polyester film caps, 0.47uF 450V. The circuit may be running at the wrong frequency, you may be hearing the harmonics of the running frequency.
          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

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            #25
            Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

            Hey! Thanks for the tip.

            Any thoughts on how I could fix that maybe?

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              #26
              Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

              By replacing those capacitors.
              Originally posted by PeteS in CA
              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
              A working TV? How boring!

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                #27
                Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                Ahh, again I am not very into how everything is connected and wired so that's why I asked. I will get to it but I am also curious about what this friend of Kahdgar might say about the photos.

                Thanks!!

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                  #28
                  Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                  HI. i Got every Got damn Cap replaced. (twice)
                  the first 10-15 hours i hear nothing. then it starts to buzz really quit and gets louder.

                  it gets louder with brightness and macbook plugged. I run this with a mac mini and my macbook gets charged over the display.


                  anyone knows wich component also needs to replaced?

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                    #29
                    Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                    Hey! I have FINALLY gotten around to getting the caps changed and I put the screen back together tonight. So far everything is perfect. No buzzing. But I got a little worried now that I read your post, typturbo. I am just gonna cross my fingers and hope for the best.

                    Thank you so much for all the help, Th3_uN1Qu3, budm and Khadgar!

                    Comment


                      #30
                      Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                      .. And? everything fine?

                      i got mine in the ofen and glued every cap to the board.
                      this worked for me for 2 weeks.

                      But now. the same its buzzing all the time and loud, very loud.

                      again. i put this in the often and resolder some parts.
                      let's see

                      Comment


                        #31
                        Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                        Well the buzzing IS back. Today it started again. I unplugged the magsafe connection to the mackbookpro and it got quieter but it is there. This kills me. So annoying. Well I do not know what I should do now. Maybe replace more of the components. I only replaced the green taicon capacitors so maybe I have to replace them all. Any ideas? How is it going for you typturbo?

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                          #32
                          Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                          Could it be the coils that are making the buzz? Or the Polyester film caps, 0.47uF 450V? Those were making the buzz when I listened the last time. Would it help to replace them? Does anyone have a clue why the buzzing stopped for a week after replacing the capacitors and then returned slowly? I really don't know what to do here. Thanks!
                          Last edited by BeginnerEnthusiast; 04-22-2014, 02:12 PM.

                          Comment


                            #33
                            Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                            exactly the same with mine. i could buy i new psu for around 150€, but there have to be the possibility to fix the old one.

                            no idea so far. pls let me know if something works.

                            Comment


                              #34
                              Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                              Hello again!

                              I have tried and failed again. Last week I opened up the screen took the PSU out and glued the copper transformers hoping this would end the buzzing. I put the glue over and around the transformers and let it set. I then put the screen back together and started it up. It was silent. For three days. Now it has started again and it is as bad as before.

                              Now I and stuck again and I would really appreciate further advice. Should I have the transformers replaced with new ones? Should I just replace the whole PSU? Any other tips/thoughts?

                              Thank you!

                              Comment


                                #35
                                Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                                Have you tried unplugging the power and letting it overnight to see if that made a difference ?
                                I ask because basically this is what you unintentionally did when you took it apart to glue the parts.

                                I looked at your old pictures--On the orange plastic coated capacitors that are against each other: Are they the same numbers ? I ask this because one is a bit fatter than the other and I have seen these get fat on other boards when they fail

                                Comment


                                  #36
                                  Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                                  So, I managed to connect the Psu outside the display and took 5x12V (80mAH)motors to strain the PSU.
                                  after couple of hours the orange film caps begann to buzz, louder and louder.

                                  If u touch the orange with an isolated screw driver the buzz gets different.

                                  I i decided to replaced those orange film Caps 2x 1uF 450V and 1x 470nF 450v.
                                  hard to get those here in Germany. had to order those.

                                  Psu for around 2 hours in Use. Let's see.
                                  I give u an update

                                  ######
                                  UPDATE:

                                  it's there again...
                                  got a new PSU on my desk.

                                  I'm done with that
                                  Last edited by typturbo; 05-15-2014, 10:29 AM.

                                  Comment


                                    #37
                                    Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                                    Damn it!!

                                    Did you get a new PSU for the screen or do you mean you got a new screen? I am thinking about getting a new PSU and see if it works.

                                    Comment


                                      #38
                                      Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                                      Now you might have an idea as to why they only produced this model for 1 year !!

                                      I had a Samsung board doing this when hot and I tried changing all kinds of caps, resistors and diodes before I found that it was the actual transformer causing the issue.
                                      Maybe the one transformer on these is a POS

                                      Comment


                                        #39
                                        Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                                        Hi I bought a new psu, put it in and test it for a while.
                                        and yes it works.

                                        So i sold the display and everything worked great.

                                        But after 3 months the buyer of the display told me, that de display now begins to flicker or went black. if he starts his mac mini (2009) sometimes.

                                        Comment


                                          #40
                                          Re: Apple Cinema Display 27" No TBolt - Buzzing and then dead

                                          Hey man!

                                          Thanks for the update! Guess what? I still have not been able to fix mine but I am definitely thinking of being a new PSU-card.

                                          Where did you buy it and what did it cost?

                                          Thanks!

                                          /Jakob

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