1. Forum
  2. Usenet
  3. UK.D-I-Y

  • Re: Circuit board clean up

    From The Natural Philosopher@21:1/5 to Lee Nowell on Mon Jan 22 17:32:07 2024
    On 22/01/2024 16:48, Lee Nowell wrote:
    Hi all,

    I have a circuit board which I need to replace a relay on. One of the
    pads seems to have over heated and left residue on the exposed
    copper. When I remove the relay I was looking to clean up the pads to
    make sure the new one is connected correctly.

    What is the best way to do this without further damaging the pad? I
    have rosin flux but this is solid.

    IPA is generally best solvent with fibreglass brush.

    But any abrasive will also clean up the board, if the pad is still
    properly attached to the subtsrate

    Thanks

    Lee.

    --
    Canada is all right really, though not for the whole weekend.

    "Saki"

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Max Demian@21:1/5 to The Natural Philosopher on Mon Jan 22 17:56:21 2024
    On 22/01/2024 17:32, The Natural Philosopher wrote:
    On 22/01/2024 16:48, Lee Nowell wrote:

    I have a circuit board which I need to replace a relay on. One of the
    pads seems to have over heated and left residue on the exposed
    copper. When I remove the relay I was looking to clean up the pads to
    make sure the new one is connected correctly.

    What is the best way to do this without further damaging the pad? I
    have rosin flux but this is solid.

    IPA is generally best solvent with fibreglass brush.

    Domestic meths would be a reasonable substitute if you don't have access
    to IPA. I cleaned up my router board with that after spilling milk on it.

    --
    Max Demian

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From The Natural Philosopher@21:1/5 to Max Demian on Mon Jan 22 18:00:07 2024
    On 22/01/2024 17:56, Max Demian wrote:
    On 22/01/2024 17:32, The Natural Philosopher wrote:
    On 22/01/2024 16:48, Lee Nowell wrote:

    I have a circuit board which I need to replace a relay on. One of the
    pads seems to have over heated and left residue on the exposed
    copper. When I remove the relay I was looking to clean up the pads to
    make sure the new one is connected correctly.

    What is the best way to do this without further damaging the pad? I
    have rosin flux but this is solid.

    IPA is generally best solvent with fibreglass brush.

    Domestic meths would be a reasonable substitute if you don't have access
    to IPA. I cleaned up my router board with that after spilling milk on it.

    cellulose thinners and acetone also work, but are more aggressive and
    may attack components

    --
    "An intellectual is a person knowledgeable in one field who speaks out
    only in others...”

    Tom Wolfe

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Joe@21:1/5 to junk@admac.myzen.co.uk on Mon Jan 22 21:39:10 2024
    On Mon, 22 Jan 2024 20:45:07 +0000
    alan_m <junk@admac.myzen.co.uk> wrote:

    On 22/01/2024 18:00, The Natural Philosopher wrote:
    On 22/01/2024 17:56, Max Demian wrote:
    On 22/01/2024 17:32, The Natural Philosopher wrote:
    On 22/01/2024 16:48, Lee Nowell wrote:

    I have a circuit board which I need to replace a relay on. One
    of the pads seems to have over heated and left residue on the
    exposed copper. When I remove the relay I was looking to clean
    up the pads to make sure the new one is connected correctly.

    What is the best way to do this without further damaging the
    pad? I have rosin flux but this is solid.

    IPA is generally best solvent with fibreglass brush.

    Domestic meths would be a reasonable substitute if you don't have
    access to IPA. I cleaned up my router board with that after
    spilling milk on it.

    cellulose thinners and acetone also work, but are more aggressive
    and may attack components


    Water would also work for milk. Ideally de-ionised/distilled water
    but cold water from the tap will do in some cases. If after using
    this method it's wise to leave the board for hours in a warm place
    for any water under components to dry out.

    Some assembled PCB boards are also washed in water if a water soluble
    flux has been used.


    I used to use water with a small amount of detergent to remove leaked electrolyte from failed electrolytic capacitors, then clean water to
    rinse and then leave to dry. Then examine for partly-eaten tracks...

    --
    Joe

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)