HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 3/3
tekochip
User Rank
Platinum
Re: Bad solder
tekochip   10/23/2012 11:03:08 AM
NO RATINGS
I agree, I've seen it over and over. Themes solder formulations make such ugly looking joints that it's nearly impossible to tell from a visual examination if the joint is good or not. The EU really has to examine this issue again. I think they made a bad call.

Larry M
User Rank
Platinum
Bad solder
Larry M   10/23/2012 10:38:37 AM
NO RATINGS
You wrote ". The problem was immediately apparent: several cold solder joints on one of the relays. I re-soldered every joint on the board because there was so little solder used in manufacturing that future failures were inevitable. Sure enough, the problem was solved.

"We then pulled the module on his Accord and found exactly the same problem -- exactly the same pins, even! The same remedy with the same result, the problem was resolved."

Not at all surprising. The misguided European rulings changing the composition of solder has resulted in formulations that are brittle and become more brittle with age. Electrical appliances, cellphones, cameras, music players, and cars are all failing prematurely due to this terribly ill-considered decision. I received a set-top box sent from 200 miles away, and received it with a surface mount IC (BGA) rattling around in the bottom.

I am sure you made the repairs with 60/40 or 63/37 Pb/Sn solder which should have been used in the first place.

This is not to mention the "tin-whisker" problem, also caused by the new solder formulations and suspected of causing the runaway Toyota accelerations.

 

Larry M
User Rank
Platinum
Not good to replace a thermal breaker with a fuse
Larry M   10/23/2012 10:30:44 AM
NO RATINGS
Cars have used self-resetting thermal breakers instead of fuses on the headlights as early as the 1940s. There's a reason for this. On a pitch black country road on a cloudy moonless night, you don't want to be pitched into sudden darkness--and with no way to get home, just because wire insulation chafed through someplace.

You might be able to find and replace that fuse in blackness, but could your wife?

Better that you or she should drive home with blinking lights, cycling at a rate low enough to prevent fire or further wire damage but high enough for safety--to see and be seen.

<<  <  Page 3/3


Partner Zone
Latest Analysis
The engineers and inventors of the post WWII period turned their attention to advancements in electronics, communication, and entertainment. Breakthrough inventions range from LEGOs and computer gaming to the integrated circuit and Ethernet -- a range of advancements that have little in common except they changed our lives.
The age of touch could soon come to an end. From smartphones and smartwatches, to home devices, to in-car infotainment systems, touch is no longer the primary user interface. Technology market leaders are driving a migration from touch to voice as a user interface.
Soft starter technology has become a way to mitigate startup stressors by moderating a motor’s voltage supply during the machine start-up phase, slowly ramping it up and effectively adjusting the machine’s load behavior to protect mechanical components.
A new report from the National Institute of Standards and Technology (NIST) makes a start on developing control schemes, process measurements, and modeling and simulation methods for powder bed fusion additive manufacturing.
If you’re developing a product with lots of sensors and no access to the power grid, then you’ll want to take note of a Design News Continuing Education Center class, “Designing Low Power Systems Using Battery and Energy Harvesting Energy Sources."
More:Blogs|News
Design News Webinar Series
3/31/2015 11:00 a.m. California / 2:00 p.m. New York
2/25/2015 11:00 a.m. California / 2:00 p.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
5/7/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Apr 20 - 24, Taking the Internet of Things to the Cloud
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Last Archived Class
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service