Results 1 to 8 of 8

Thread: PCB traces showing

  1. #1
    Guerilla Warrior
    MCF 76's Avatar
    Join Date
    Jan 2010
    Location
    Doucherville, IN

    Posts
    1,731

    PCB traces showing

    Hey guys,

    After cleaning some of my pcb's this week I noticed on one particular board that the green coating has come off on a few of the small traces. Should this be coated with something to protect it? Never seen this happen before but after you clean 15-20 bound to run into something new.

    Searched a bit about traces showing and how to protect it. Looks like i need to just get a spray can of "conformal coating" clear from a local electronic store. There are like 3 maybe 4 spots showing on the back of this pcb. I just got done cleaning it so going to let it dry all night and tomorrow go get a can of that stuff. Might as well mask off board and spray the whole back side since there are several spot showing.

    Anybody mess with this stuff?
    Last edited by MCF 76; 06-16-2017 at 08:40 PM.
    "NG.com breaking balls & crushing dreams since '99".

  2. #2
    Neo Bubble Buster
    drmadd220's Avatar
    Join Date
    Feb 2006
    Location
    NY

    Posts
    43
    Quote Originally Posted by MCF 76 View Post
    Hey guys,

    After cleaning some of my pcb's this week I noticed on one particular board that the green coating has come off on a few of the small traces. Should this be coated with something to protect it? Never seen this happen before but after you clean 15-20 bound to run into something new.
    You should get an overcoat pen and cover back over those. You can find them on amazon, like the one from MG chemicals. They run about $10 to $15.
    MVS 4-slot Big Red


  3. #3
    Guerilla Warrior
    MCF 76's Avatar
    Join Date
    Jan 2010
    Location
    Doucherville, IN

    Posts
    1,731
    Quote Originally Posted by drmadd220 View Post
    You should get an overcoat pen and cover back over those. You can find them on amazon, like the one from MG chemicals. They run about $10 to $15.
    The "acrylic" type should be plenty good enough you think? The other types are a bitch to remove like polyurethane etc.
    "NG.com breaking balls & crushing dreams since '99".

  4. #4
    We have purposely
    trained him wrong
    ...as a joke.
    ChuChu Flamingo's Avatar
    Join Date
    Nov 2010
    Location
    US

    Posts
    1,730
    One has to be careful when cleaning arcade boards. Just the simple act of cleaning can remove the clear coat, but even more so rubbing alcohol removes it with great ease.

    I've noticed this on a few cartridges before in one spot where the conformal coating is missing and it seems to me to just be a quality control issue/probably due to age.

    I would definitely try the pen, spraying seems like a bad idea as it harder to control where it goes unless you mask the board.
    Last edited by ChuChu Flamingo; 06-17-2017 at 05:14 AM.


    he spends hundreds on scarves, of course he's a fag and then ChuChu Flamingo preserved the aftermath in a plastic case making sure it wasn't exposed to unstable air
    You're just upset that you're too goddam stupid to understand the games and whiff infinites.

  5. #5
    Guerilla Warrior
    MCF 76's Avatar
    Join Date
    Jan 2010
    Location
    Doucherville, IN

    Posts
    1,731
    Quote Originally Posted by ChuChu Flamingo View Post
    One has to be careful when cleaning arcade boards. Just the simple act of cleaning can remove the clear coat, but even more so rubbing alcohol removes it with great ease.

    I've noticed this on a few cartridges before in one spot where the conformal coating is missing and it seems to me to just be a quality control issue/probably due to age.

    I would definitely try the pen, spraying seems like a bad idea as it harder to control where it goes unless you mask the board.
    This board I'm working on looks to me it was a quality issue with it also. Because there is some small dots on the back side on one of the corners where the coating looks like it never adhered to properly. The OG coating looks to be poorly applied compared to all the other boards I've looked at. Almost has a brushed look instead of the slick blemish free look all the others have. I also noticed after cleaning that it has been touched up before by a pen. You can see the build up of it in certain small areas. The top side however is perfect no traces showing at all. So this was the only board I have that had these issues thank god. The game worked fine before I cleaned it lol hopefully it will once I get it back together.
    "NG.com breaking balls & crushing dreams since '99".

  6. #6
    We have purposely
    trained him wrong
    ...as a joke.
    ChuChu Flamingo's Avatar
    Join Date
    Nov 2010
    Location
    US

    Posts
    1,730
    Makes me wonder if it was applied by hand hah. Usually it is sprayed evenly, but you never know.

    It isn't a major catastrophe if a trace is showing though unless you live in a humid place. With this in mind however, it is a good idea to cover it just to protect it from potential tarnish/scratches depending upon your storage conditions..
    Last edited by ChuChu Flamingo; 06-17-2017 at 09:53 AM.


    he spends hundreds on scarves, of course he's a fag and then ChuChu Flamingo preserved the aftermath in a plastic case making sure it wasn't exposed to unstable air
    You're just upset that you're too goddam stupid to understand the games and whiff infinites.

  7. #7
    Bashful Neophyte

    Join Date
    Jun 2017
    Location
    Canada

    Posts
    13
    Can you post some photos of the solder mask defect? Perhaps there is more to the story we can identify before re-sealing

  8. #8
    JammaNationX
    Xian Xi's Avatar
    Join Date
    Dec 2005
    Location
    Waipahu, Hawaii

    Posts
    27,473
    Use a non-metallic green or matching color nail polish. Clean the area first with some IPA. If the trace has rust on it or corrosion then use a fiberglass pen to clean it off first before the IPA.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •