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    #21
    Re: What bad glue can do to the board

    Hot glue FTW.
    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!

    Comment


      #22
      Re: What bad glue can do to the board

      Originally posted by mockingbird View Post
      I don't agree... If soldering itself was enough to prevent cold joints due to oscillations, then it would never have been used in the first place... I'm aware that the adhesive is also used to keep components in place during flow soldering, but its main purpose is for high-frequency vibration absorption.
      For the coils, maybe. But at least they usually have insulation around the wire, so conductive glue isn't much of an issue there. For capacitors and transistors, though, there is no need to glue them in place, as they don't vibrate (and they're not heavy enough to put much stress on the soldering either).
      Last edited by c_hegge; 01-24-2014, 03:59 AM.
      I love putting bad caps and flat batteries in fire and watching them explode!!

      No wonder it doesn't work! You installed the jumper wires backwards

      Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

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      Comment


        #23
        Re: What bad glue can do to the board

        Originally posted by Th3_uN1Qu3 View Post
        Hot glue FTW.
        That's what we use in my shop after repairs.

        Never had an issue with it.

        Comment


          #24
          Re: What bad glue can do to the board

          Originally posted by budm View Post
          Got 6 Samsung 245bw in, 3 were fixed by just removing bad glue, other 3 are badly damaged (will have to do more repair later).
          More degraded glue horror stories. Have encountered plenty of such cases in many different equipment ranging from monitors, speakers to even everyday household appliances. The electronics industry is fond of them, and at least always gave us something (usually a mess) to work on (cleaning up and fixing that mess)...

          Originally posted by Kiriakos GR View Post
          There is no issue with the glue it self, the one who placed it over the PCB he added too much, and caused a violation regarding the Creepage distance in a HV circuitry.
          That's very incorrect. The degraded glue plague itself can cause problems (by being conductive and corrosive) and it does not have to be high voltage (for example, many audio amplifier and speaker systems suffers from this degraded glue causing malfunctions and brown outs)...

          Comment


            #25
            Re: What bad glue can do to the board

            Originally posted by lexwalker View Post
            That's very incorrect. The degraded glue plague itself can cause problems (by being conductive and corrosive) and it does not have to be high voltage (for example, many audio amplifier and speaker systems suffers from this degraded glue causing malfunctions and brown outs)...

            This glue is added as mechanical support over components which possibly are in risk due vibrations, which eventually will cause damage to their soldering leads.

            One strong chemical reaction needs two hostile recipes in the mix.
            The one recipe is the glue (chemical composition) the other is the varnish (chemical composition) which the manufacturer of one electronic part selected to use as additional protection against corrosion by humidity.

            In manufacturing, tests regarding dielectric straight of chemical compositions, or if a part it does met it specifications regarding electrical isolation, it is in the hands of engineers.

            If they do their job properly? Then there is no problem.
            One of my huge enemies as thinker repair man, is this tendency of some people about generalizing and jump in conclusions, based on very few experiences of their own.

            Even the industry of true hole resistors (for example) have update with out public notice the manufacturing process and materials, so the new components to become environmentally friendly.

            And I am coming today to ask you all?
            Which evidence and standards we are going to use so to come down in a conclusion?
            1) The ones before 20 years?
            2) The latest?
            3) The work done in a single factory which did not comply to any manufacturing standard ( American or European ) regarding the use of safe parts and workmanship ?

            Such important conversations have value if the participants qualify enough so to offer answers, instead of opinions.

            Comment


              #26
              Re: What bad glue can do to the board

              "One of my huge enemies as thinker repair man, is this tendency of some people about generalizing and jump in conclusions, based on very few experiences of their own."
              It is obviously that you have not learn or done any more research abut this glue problem, more than one factories used these glue in the past.
              From the article:
              A Google search for “conductive brown glue” finds more than 100,000
              references, some of which mention the glue’s role in various CRT display
              problems and its use in consumer audio equipment. Searching for
              “chloroprene adhesive,” Google finds 56,000 references, including one from a Sony division that contains the
              following cautionary note: “The products…contain chloroprene rubber…. Prolonged standing in a high-temperature
              environment…may cause thermal dechlorination, possibly resulting in the corrosion of metal parts nearby, or in a loss
              of insulation resistance. Please be sure to avoid any use of these materials in electronic components that are to be
              energized electrically to prevent tracking or similar problems.”
              You also never use conformal coating since you claim "There is no issue with the glue it self, the one who placed it over the PCB he added too much, and caused a violation regarding the Creepage distance in a HV circuitry."
              Time for you to change from "PRO" to "Knowledge seeker" and learn what the creepage and clearance are about.

              From the Greek web site: "Due my unexplained insistence about perfect ness, and about learning new things almost daily, usually I can reach subjects close to the level of engineering. I have helped lots of trainees to advance fast in the job, by using the “Kiriakos teaching method”, which is to use small stories of unrelated examples, but with common essence. ( In a way, what Jesus did). " Just like Jesus eh!
              http://www.ittsb.eu/about.html
              Attached Files
              Last edited by budm; 01-24-2014, 09:59 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


                #27
                Re: What bad glue can do to the board

                Originally posted by Kiriakos GR View Post
                ...
                Sometimes pictures can tell a thousand words. Do these pictures tell the story? Once a while I would take some snapshots of degraded glue and the carnage...
                Attached Files
                Last edited by lexwalker; 01-24-2014, 12:14 PM.

                Comment


                  #28
                  Re: What bad glue can do to the board

                  @lexwalker: No, that is not good enough evidence for the Greek, and since you do not have "PRO" in your sig, he cannot take you seriously and tell you that you are just a kid at the key board. He needs to teach us " In a way, what Jesus did"
                  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


                    #29
                    Re: What bad glue can do to the board

                    I'm surprised you guys didn't learn already to just ignore him. I'm not wasting my breath and my fingers on him anymore...

                    Comment


                      #30
                      Re: What bad glue can do to the board

                      More example.
                      Attached Files
                      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


                        #31
                        Re: What bad glue can do to the board

                        Originally posted by c_hegge View Post
                        I just never use glue. There's really no need to IMO. The soldering is more than enough to hold the components in place (at least on the average TV/Monitor/PC PSU PCB).
                        Originally posted by mockingbird View Post
                        I don't agree... If soldering itself was enough to prevent cold joints due to oscillations, then it would never have been used in the first place... I'm aware that the adhesive is also used to keep components in place during flow soldering, but its main purpose is for high-frequency vibration absorption.
                        I half agree. With lead-free stuff, you need that glue, since that stuff is so brittle. Usually extra large components should have extra pins for more stability on the board, like those 4 pin snap-in capacitors.

                        Originally posted by mariushm View Post
                        I'm surprised you guys didn't learn already to just ignore him. I'm not wasting my breath and my fingers on him anymore...
                        I'd say the same, if someone is bothering you, just ignore. If they keep bothering you, then report them.

                        Originally posted by Th3_uN1Qu3 View Post
                        Hot glue FTW.
                        Totally!
                        Muh-soggy-knee

                        Comment


                          #32
                          Re: What bad glue can do to the board

                          Originally posted by budm View Post
                          "
                          A Google search
                          Stick to your favorite Google search, mostly because is free of charge.

                          Comment


                            #33
                            Re: What bad glue can do to the board

                            "Stick to your favorite Google search, mostly because is free of charge." So, please tell us more Jesus!
                            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


                              #34
                              Re: What bad glue can do to the board

                              stop feeding the troll and it will go away.only reason kirakos is not on ignore here is because i am a moderator charged with enforcement of forum rules.

                              Comment


                                #35
                                Re: What bad glue can do to the board

                                Hello badcaps, i was reading this thread and found it interesting because i encountered the same yellow glue (i think) in a Klipsch Audio Amplifier, can you confirm it is the same thing:
                                http://i.imgur.com/L14Q8.jpg
                                Id like to know which tool and which chemical cleaning solution do you recommend to remove this damn glue? I had a horrible plain to remove it but i think i used wrong method (i used cutter and tweezers). Thx.

                                Comment


                                  #36
                                  Re: What bad glue can do to the board

                                  I use Alcohol to soften them first, it does take awhile, you can also use small cutter to trim it off as much as you can, scraping with small thin blade also help, just take your time.
                                  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


                                    #37
                                    Re: What bad glue can do to the board

                                    I have never encountered the glue problem. I guess I'm lucky in that respect. On certain video chips that are BGA (ball grid array). I have oftentimes encountered glue surrounding the entire chip. I have a hot air station, and I just heat the glue and peel it away with a dental pick. Does hot air not work with this type of glue, to soften it?

                                    Comment


                                      #38
                                      Re: What bad glue can do to the board

                                      No. That's exactly the thing - with heat, the bad glue turns from yellow to brown and becomes corrosive and conductive. It also hardens rather than softens, making it break in little pieces when you scrape it off.
                                      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!

                                      Comment


                                        #39
                                        Re: What bad glue can do to the board

                                        Ok, so isopropyl alcohol (that i use to clean flux on PCB) should be used. I had tried acetone and it wasnt working at all. I also tried hot air (with my SMD rework station) without any luck too, this glue cant melt even with high temperature.
                                        Based on my reads it contains chloroprene or melamine material, right?

                                        Comment


                                          #40
                                          Re: What bad glue can do to the board

                                          Yet again im bringing up an old thread lol

                                          I have a STA250TV psu from a 32" Bush Tv it had clumps of the horrible glue all over the place, it corroded the board that bad that it ate through the copper traces which come off the output diode to the output choke ! Crazy stuff !
                                          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                                          https://www.facebook.com/Telford-Tel...7894576335359/

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