0
\$\begingroup\$

I have some PCB's that I have ordered from China. The PCB has a BGA component along with traces which go from the BGA component to another BGA IC(USB controller) and finally to USB. Right now I am very interested in 2 lines on a PCB. I think I can find the trace which is going but it is insulated. I dont want to cut the trace and bring out a wire and reattach the wire to the other part of a trace to probe the line on my Logic Analyzer. Is there any other chemical which will easily remove the insulation and expose the copper and help me probe the trace? What are the alternative I have?

\$\endgroup\$
  • 2
    \$\begingroup\$ Add probe points in your next design, especially when prototyping. \$\endgroup\$ – Arsenal Nov 23 '15 at 9:18
  • \$\begingroup\$ I am reverse engineering a working I2C interface. It isnt my PCB, and the register set isnt working for me correctly. I want to see the actualy I2C data which I am supposed to send \$\endgroup\$ – red car Nov 23 '15 at 9:23
  • 3
    \$\begingroup\$ Possible duplicate of How to remove solder mask? \$\endgroup\$ – Arsenal Nov 23 '15 at 9:30
  • \$\begingroup\$ Not really. Even if I remove the solder mask, how do I get the probe to clip correctly? I have to solder a wire which is tough given traces are so small \$\endgroup\$ – red car Nov 23 '15 at 9:36
  • 1
    \$\begingroup\$ Best chemical for the job is iron with 1% or so of carbon. Heat treat to harden and temper, and use abrasives to bring it to a sharp edge. Then you can scrape the insulation off and solder to the copper. \$\endgroup\$ – Brian Drummond Nov 23 '15 at 10:58
1
\$\begingroup\$

Solder mask is some sort of thermoset polymer. Solvents for that sort of stuff are nasty. Look for a mechanical solution instead. Steel tools can scratch the mask off without damaging much the copper.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.