removing glued s/mount chips lg lb series

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • jimbofz
    Badcaps Veteran
    • Apr 2013
    • 537
    • uk

    #1

    removing glued s/mount chips lg lb series

    recently struggled to remove BL0202 backlight chip
    which had red residue of glue underneath
    as well as annoying laquer over the top and surrounding area.
    i had to use more heat than i like to remove it
    which can cause bubbling of the bcb
    i used two different types of flux,but it was the glue causing the problem .
    just wondered if anyone has had this problem ,and if there is any solvent that may loosen the glue before desoldering?
    (some vestel fets are also glued the same way)
    this was on a LG47 LB585V,
    I had replaced the led strips which were badly discoloured only to find q806 mdhd 4n20y s/c
    r840 burnt
    and bl0202b s/c
  • CapLeaker
    Leaking Member
    • Dec 2014
    • 8035
    • Canada

    #2
    Re: removing glued s/mount chips lg lb series

    Cut the legs of with a knife, remove the chip, then desolder the rest of the legs on the pads.

    Comment

    • jimbofz
      Badcaps Veteran
      • Apr 2013
      • 537
      • uk

      #3
      Re: removing glued s/mount chips lg lb series

      thanks at least someone reads my posts
      thats a good idea
      but when salvaging a chip from a scrap board obvious wont work
      so any thaughts on solvent to loosen the bond ?
      this repair has caused me grief as the availibility of MDHT4N20Y fet
      i could order from china but waiting 2 months is the problem
      even the chip BL0202B are scarce in uk

      Comment

      • diif
        Badcaps Legend
        • Feb 2014
        • 6978
        • England

        #4
        Re: removing glued s/mount chips lg lb series

        Plenty of people read the posts, photos always help get a response.
        I'm guessing the red glue is adhesive not underfil so a bit of heat and one of the BGA blades to cut it.
        I'm not sure where you're ordering from but my stuff takes around 2 weeks from Aliexpress.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30951
          • Albion

          #5
          Re: removing glued s/mount chips lg lb series

          philips use the red glue, you just heat the chip with hot air till the solder melts - then twist it with tweezers and the glue breaks.
          it's weakened by the heat

          Comment

          • jimbofz
            Badcaps Veteran
            • Apr 2013
            • 537
            • uk

            #6
            Re: removing glued s/mount chips lg lb series

            Originally posted by stj
            philips use the red glue, you just heat the chip with hot air till the solder melts - then twist it with tweezers and the glue breaks.
            it's weakened by the heat
            what max temp would you suggest ? i normally use 250 degrees
            i had to turn up to max to budge it which is not good for the pcb

            Comment

            • jimbofz
              Badcaps Veteran
              • Apr 2013
              • 537
              • uk

              #7
              Re: removing glued s/mount chips lg lb series

              Originally posted by diif
              Plenty of people read the posts, photos always help get a response.
              I'm guessing the red glue is adhesive not underfil so a bit of heat and one of the BGA blades to cut it.
              I'm not sure where you're ordering from but my stuff takes around 2 weeks from Aliexpress.
              i must just be unlucky
              aliexpress varies so much with del times
              and quality of product is sometimes poor

              Comment

              • cheeky2
                Badcaps Veteran
                • Dec 2012
                • 336
                • uk

                #8
                Re: removing glued s/mount chips lg lb series

                Originally posted by jimbofz
                i must just be unlucky
                aliexpress varies so much with del times
                and quality of product is sometimes poor
                When you order on Aliexpress the cheapest option of postage is always the longest. You can select a quicker speed of postage more expensive that gets delivery within a couple of weeks.
                It is not intuitive to select the higher postage costs but it's generally available on all listings, as I recall you use a dropdown menu to select different options within your basket. Look and use sellers by the quantity of the orders and there feedback of the quality of the goods. Don't just buy product only on the basis of the price, which I am guessing you have done previously. You may pay a little extra but at least you will get it quicker and better quality.

                Comment

                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 30951
                  • Albion

                  #9
                  Re: removing glued s/mount chips lg lb series

                  heat needs to be 300-350 really

                  as for ali, dont use "super cainiao" shipping, stick with ali standard or saver

                  Comment

                  • jimbofz
                    Badcaps Veteran
                    • Apr 2013
                    • 537
                    • uk

                    #10
                    Re: removing glued s/mount chips lg lb series

                    Originally posted by stj
                    heat needs to be 300-350 really

                    as for ali, dont use "super cainiao" shipping, stick with ali standard or saver
                    ive always tried to remove s/m components with the minimum temp
                    and then increase temp if the item is stubborn
                    and use the smallest nozzle on my s station
                    to prevent other close components flying off .
                    i will try 300-350 thanks

                    Comment

                    • jimbofz
                      Badcaps Veteran
                      • Apr 2013
                      • 537
                      • uk

                      #11
                      Re: removing glued s/mount chips lg lb series

                      Originally posted by cheeky2
                      When you order on Aliexpress the cheapest option of postage is always the longest. You can select a quicker speed of postage more expensive that gets delivery within a couple of weeks.
                      It is not intuitive to select the higher postage costs but it's generally available on all listings, as I recall you use a dropdown menu to select different options within your basket. Look and use sellers by the quantity of the orders and there feedback of the quality of the goods. Don't just buy product only on the basis of the price, which I am guessing you have done previously. You may pay a little extra but at least you will get it quicker and better quality.
                      thanks thats good advice
                      i will follow it on next order

                      Comment

                      Related Topics

                      Collapse

                      • acedogblast
                        Guide to transplant MEC1503 EC chip and EEPROM reprogamming for T14s gen 2 and X13 gen 2
                        by acedogblast
                        This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.

                        There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as...
                        11-02-2024, 05:13 PM
                      • ugamazing
                        Best place to source RAM chips? 8GB 820-00850 boards to 16GB or 32GB
                        by ugamazing
                        I'm looking to upgrade several 8GB 820-00850 boards to 16GB or 32GB for personal use. I am curious what the best practice and process is for sourcing new replacement chips, and what vendor(s) you guys prefer? Another question is, how do I find compatible chips and their corresponding part/model numbers? For example, in the 820-00850 schematic, the DDR chip U2600 model listed (EDFB232A1MA) corresponds to 1x32GB chip. Of course, I would need 4x8GB chips to replace the 4x2GB chips currently on the board. How do I find compatible 8GB chips? Is it as simple as searching "BGA178 8GB 2133"...
                        08-31-2022, 07:34 AM
                      • harp
                        Metod for removing glued heatsink from fragile component
                        by harp
                        I have peltir element glued to heatsink with something thick and sticky like putty... it cant be separate with force or heat without risk of breaking ceramic or damaged semiconductor layers due to force (eg if try twisted, pulled, lifted)... method that I am using is a single thread for needle (thin and firm thread of pure polyester that cant break with bare hands without glowes), and using it like a saw between heatsink and peltir. I holding a heatsink with knee against table. It slowly cut throug putty and release glued parts. It is slow proces, but preserve undamaged component and heatsink....
                        06-23-2025, 02:01 PM
                      • ktmmotocross
                        how to remove black glue in edges of chips in Lenovo laptops?
                        by ktmmotocross
                        hello.
                        That black glue in edges of chips on Lenovo laptops always lift me pads so i stop reworking them. Is there anyway how to get rid of it gently?
                        11-16-2023, 01:17 AM
                      • Document Archive
                        Surface Mount Fuses Fundamentals Datasheet
                        by Document Archive
                        TE Circuit Protection offers the widest selection of surface-mount fuses available for addressing a broad range of overcurrent protection applications. Helping to prevent costly damage and promote a safe environment for electronic and electrical equipment, our single-use chip fuses provide performance stability to support applications with current ratings from .5A up to 20A.

                        TE Circuit Protection also offers the telecom FT600 fuse for telecommunications applications. This telecom fuse helps comply with North American overcurrent protection requirements, including Telcordia, GR-1089,...
                        10-07-2024, 06:07 AM
                      • Loading...
                      • No more items.
                      Working...