World Authority on Circuit Board Rework, Repair and Modification
Published by Circuit Technology Center  and CircuitMedic
February 22, 2017
The Case of the Missing SMT Pads
The Case of the Missing SMT Pads
Everyone loves a good mystery, unless, of course, that mystery has to do with something important that's missing from your valuable circuit boards! We often discuss methods of repairing circuit boards, and things that are already on the board - but what about replacing surface mount pads that were never there to begin with? This mystery could be called Case of the Missing SMT Pads. Apparently, a military contractor had a problem. Some SMT pads were missing from some circuit boards ...
Feature Story
Can a Few Contaminated Joints Cause an Assembly to Fail RoHS Compliance?
Ask the Experts
Let's say I have 400 lead-free components on a board. All were processed with lead-free paste, but some of the joints were cross-contaminated with leaded solder during touch-up. All of the reworked component joints were tested with an XRF gun. Five joint locations failed. A few were in the yellow zone (around 950ppm), the remaining were in the acceptable range. If I could calculate that the ...
Ask the Experts
Rework Challenges for Smart Phones and Tablets
The Case of the Missing SMT Pads
This paper reviews the challenges and process steps needed for successful repair of surface mount devices on very densely packaged circuit boards ...
Technical Library
Solder Joint Opens - What To Do?
The Case of the Missing SMT Pads
Electronic components are soldered to circuit boards every day and in some cases opens are found during x-ray inspection or during test. You may be inclined to re-heat and reflow the solder using a little extra flux. It's reasonable to think this will work but it can be deflating when it is not effective. In a desperate attempt to correct the defect, the process may be repeated at ...
Feature Story
How Commercial Drones Will Optimize the Supply Chain
The Case of the Missing SMT Pads
Drone vehicles of all sorts are becoming cheaper, smarter, more powerful, and more reliable. When, where, and how will this techhology enter the commercial supply chain? What threats and opportunities will this create? Who will benefit the most, and who will suffer? This program will provide the answers ...
Technology Briefing
Published By
Circuit Technology Center
CircuitMedic
Contributors
Andy Price, Bob LePage, Ronna LaBranche, Jose Irizarry, Ted Farnham, Bun Chhouy, Skip Moccia, Peter Vigneau, Jeff Ferry

For over 33 years Circuit Technology Center and CircuitMedic have been recognized as the world's most innovative and reliable specialists in circuit board rework and repair services and products.
Trivia Question
Which scientific concepts is not symbolized by a capital letter: power, force, velocity or electric charge?
See the answer below.
Quote of the Day
"What in the world is electricity? And where does it go after it leaves the toaster?"
Dave Barry
Cartoon
"I've been using the same computer since 1982. They can't replace it without violating the company's age discrimination policy."
Copyright © Randy Glasbergen
Trivia Answer
Velocity is represented by the small letter 'v', power 'P", Force 'F' and electric charge 'Q'