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BrusselsSprout
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Gold
2014 Update
BrusselsSprout   7/14/2014 12:18:53 PM
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I can tell you that the effected repairs have held up to date.  What had been a monthly/weekly cycle of problems continues to operate with no incidents.

Rob Spiegel
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Blogger
Re: Early attempts at RoHS compliance?
Rob Spiegel   3/7/2012 2:37:38 PM
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Larry, you very well may be right. Yet I would think the problem would be even more widespread, enough for component manufacturers and brand owners to raise a stink about it. Yet none of them are saying much that I can see. The electronics industry seems pretty blasé about the subject these days.

 

Larry M
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Platinum
Re: Early attempts at RoHS compliance?
Larry M   3/6/2012 4:15:20 PM
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Rob,

Whether or not you choose to deny it, the tin whiskers problem is real, as are the problems with brittle joints and components stressed by overheating during assembly. Many of the complaints we hear about and read in Design News relating to poor American design or Chinese manufacturing and the short life of electronics including appliances, cameras, cellphones, computers, and MP3 players are due to problems with solder.

I've repaired my son's dryer (brittle solder joints between the relay pins and the circuit board) and the remote control for my DVR (probably tin whiskers, as the problem was resolved by brushing the closely-spaced leads of all surface-mount components with a fine brass "toothbrush." Probably a half-dozen other such repairs too.

Rob Spiegel
User Rank
Blogger
Re: Early attempts at RoHS compliance?
Rob Spiegel   3/6/2012 1:23:32 PM
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I know there are still those out there who says the problem hasn't been solved. At this ploint, that doesn't seem to be a widely held position. Even so, when electronics fail, there is a number of people who yell, "Tin Whiskers." That voice rose up when Toyota was having its accelerator problems.

Ann R. Thryft
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Blogger
Re: Early attempts at RoHS compliance?
Ann R. Thryft   3/6/2012 1:02:58 PM
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My RoHS coverage was focused on what was happening on the PCB and how replacing various materials, most obviously lead solder materials, had various effects on production and performance. That coverage slowed down, as apparently yours did, when the problems started getting solved.


Rob Spiegel
User Rank
Blogger
Re: Early attempts at RoHS compliance?
Rob Spiegel   3/2/2012 3:57:29 PM
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I didn't realize you covered RoHS, Ann. I did too. For a couple years before and after the RoHS deadline, I ran a Lead-Free Zone mini-website here at Design News. It was a hot site until the RoHS deadline came and went, at which point I shifted to covering REACH and all the different flavors of RoHS (China, Korea, California). Now it seems to be a fairly quiet subject.




Ann R. Thryft
User Rank
Blogger
Re: Early attempts at RoHS compliance?
Ann R. Thryft   3/2/2012 11:54:49 AM
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Thanks for the reply. You may well be right. RoHS compliance in electronics is just about 5 or 6 years old now. I began writing about it a couple of years before that. The problems in finding solder replacements that were good enough and didn't require cooking the board at much higher temperatures than tin/lead--thus melting other materials or at least shortening their lifespans, as well as all kinds of differential CTE problems--were legendary. Re the health issues, I'm grateful we don't have lead water pipes out here. One of these days I'll be able to replace all our galvanized steel plumbing with copper.


BrusselsSprout
User Rank
Gold
Re: Early attempts at RoHS compliance?
BrusselsSprout   3/1/2012 5:47:41 PM
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Sure Ann, I should state first off, I am only talking about an impression. I have not looked at the date of manufacture to accurately place the timeline with general RoHS compliance or to look for any detailed marking on the PWB. I think the module is at least 5 or 6 years old.

I confess I have more 37/63 Pb/Sn solder in various gauges than I will be able to consume in my lifetime. The only nod to lead replacement I have made in my personal life is to replace all the water pipes in our home and use Sb/Sn. Having a ready supply of "the Good Stuff" I repaired the fractured solder joints and retinned all the card edge connections with Pb/Sn.

I am afraid I only have anecdotal evidence and suspicions to cast aspersions on early RoHS compliance failures.. However, overall the solder job on this board I would rank as terrible, even by my amateur standards.

Ann R. Thryft
User Rank
Blogger
Early attempts at RoHS compliance?
Ann R. Thryft   2/29/2012 1:25:25 PM
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Ken, I'd like to know more about what you mean by the poor solder joints being due to early attempts at RoHS compliance. I can guess--some years ago I wrote in some detail about the problems associated with solder replacements to meet RoHS requirements. Can you elaborate a bit?


BrusselsSprout
User Rank
Gold
Re: Launch Pad Connectors
BrusselsSprout   2/28/2012 9:42:19 AM
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Your tale reminds me what else I did.  After I re-tinned the card edge connectors I cleaned them with a contact cleaner that, besides removing oxide, leaves a little mineral oil on the surface to reduce contact oxidation.


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