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Sometimes All You Need Is a Little More Solder

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Herb Johnson
User Rank
Silver
Beg the question
Herb Johnson   10/5/2015 12:56:59 PM
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The article says he removed the board, resoldered, and installed the board - and it worked. It's possible the problem was in connections to the board, and reconnecting fixed the problem. Reinstalling the board before repairs might have shown that problem if the board worked at that point. As a one-off it doesn't matter; if the goal is return to service that was satisfied. Otherwise it's a useful discussion of cold solder joints, and a review of the lead/lead-free debate.

ferd
User Rank
Platinum
Re: missing solder on new boards
ferd   7/18/2015 2:13:42 PM
This happened during the days before Six Sigma et. al.  But try as you may, you cannot legislate the world into always complying with your directives.  I thought that Six Sigma strived to eliminate problems - not pass it off as "someone elses problem". 

"You get what you specifiy, precisely and repeatably."
I believe that most people expect a near perfect item that works for the application, when they buy a new part.  That's why they tend to expect the problem to be solved when they install a new part.  But we did switch to another brand of equipment, as I think you're implying, after getting bit by several defective new parts.

Nuvistor
User Rank
Iron
Re: To make sure repair of monkey fab is not monkey do
Nuvistor   7/14/2015 11:31:11 AM
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To expand on what Splatticus said about determining whether the board has lead free solder or Sn/Pb, I have found one of the simplest ways to test for lead solder (standard 63/37) is a melting point with a soldering iron. If the sodlering iron temp is set for lead solder and a SMALL sodler joint does not melt in three seconds, then it is probably lead free which has a higher melting temp. 

Nuvistor
User Rank
Iron
Re: To make sure repair of monkey fab is not monkey do
Nuvistor   7/14/2015 11:24:10 AM
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I have found one of the simplest ways to test for lead solder (standard 63/37) is a melting point with a soldering iron. If the sodlering iron temp is set for lead solder and a SMALL sodler joint does not melt in three seconds, then it is probably lead free which has a higher melting temp. 

CPDick
User Rank
Iron
Re: 'scope & solder
CPDick   7/9/2015 11:44:21 PM
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My Tektronix 2236 is a little newer; I bought it, used, some time in the '90s. It has been so reliable I've never had a reason to look inside. It's interesting to know about the roll of silver-bearing solder inside yours.

But it really is true that 'they don't make 'em like they used to!

TAF
User Rank
Bronze
Re: missing solder on new boards
TAF   7/9/2015 11:12:07 PM

"Lessons learned:  do not trust new replacement parts.  They can be as bad as the old parts.  "

 

In this era of Six Sigma and Statistical Process Control, the replacement parts SHOULD be as bad as the old parts, since the goal of modern manufacturing processes is to make everything repeatably identical.

 

If it happens to be repeatably defective, well, that's someone elses problem.  You get what you specifiy, precisely and repeatably.

 

gafisher
User Rank
Gold
Re: EE with NO test Equipment
gafisher   7/9/2015 8:44:12 PM
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Like wbswenberg, I spent a bundle on test equipment, but I have to say that my eyes, nose and fingers found the causes of more intermittants than all my test gear put together. Loose, discolored or warm connections (power disconnected, please!) stand out pretty clearly on a circuit board.

That's not to say I never, or even seldom, depend on my test equipment; just that the sort of problem the original poster described can often be found by visual inspection.

splatticus
User Rank
Bronze
Re: To make sure repair of monkey fab is not monkey do
splatticus   7/9/2015 8:40:53 PM
Back that up? Get spoon fed much?  

stn564
User Rank
Silver
Bad solder joints
stn564   7/9/2015 4:50:49 PM
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If I had a dollar for every bad solder joint I've fixed I'd be a rich man.  Power connectors in particular are culprits, in fact anything that gets mechanical movement like headphone connectors etc.  Wave soldering machines never put enough meat on the joint.

wbswenberg
User Rank
Platinum
EE with NO test Equipment
wbswenberg   7/9/2015 2:23:06 PM
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I can't believe it.  An EE with NO test equipment.  About the first thing I did when I got the first professional job was to buy a B&K Oscope.  My wife was dusting my desk.  So I told her the Oscope cost more than the TV and to forget about dusting my desk.  

Just the willingness to look at the problem helps solve the problem.  

When I worked at the E company we had problems with a micro circuit used in a box on the V-22.  Come to find out (not by me I just instigated the looking) the solder pots had a mixture of solder and were too hot.  The micro circuit did not have continuity to the main board.  I think it was de soldering the componets on the micro board.

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