lead free solder
in [Repair]
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From: WangoTango on 25 May 2010 14:30 In article <4bfc076e$0$2364$822641b3(a)news.adtechcomputers.com>, nobody(a)but.us.chickens says... > On 5/25/2010 8:23 AM Jeffrey D Angus spake thus: > > > Smitty Two wrote: > > > >> In article <fmmck-B55AAB.20291624052010(a)5ad64b5e.bb.sky.com>, > >> Fred McKenzie <fmmck(a)aol.com> wrote: > >> > >>> One problem occurs if you use leaded solder on surface-mounted > >>> components. Lead amalgamates with the silver that is "fired" onto these > >>> components, ruining their electrical connection. > >> > >> Huh? What the devil are you talking about? > > > > This is not new. Tektronix used to include a bit of silver bearing > > solder with their scopes so you wouldn't ruin the plated ceramic > > terminal strips if you changed out parts. > > Well, it was silver-*bearing*: still mixed with lead, no? (I assume this > is pre-RoHS.) I'm sure. We keep a bunch of 3% Silver along with tin/lead for the extra wetting it gets on some stuff.
From: WangoTango on 25 May 2010 14:32 In article <ffUKn.73055$Qg5.46409(a)newsfe06.ams2>, gangprobing.alien(a)ntlworld.com says... > > "Baron" <baron.nospam(a)linuxmaniac.nospam.net> wrote in message > news:hth2v2$a0p$1(a)news.eternal-september.org... > > Hi Guys, > > > > Just for the record here's a few pictures of a laptop power socket that > > used lead free solder. You can see the erosion caused by poor > > electrical conductivity of the joint between the center pin and the > > circuit board. The hole was originally plated through but there was > > little left of the plating. An open circuit and discharged battery > > resulted in a non working machine. > > > > The images don't show in "ser" check > > in "alt.binaries.schematics.electronic" > > I just got through repairing the accumulation of PC monitors I'd taken out > of service because of lead-free solder syndrome. > > Most people scrap them and buy a new one - not very eco-friendly at all! And *THAT* is the worse part. It was a bunch of regulations to fix a problem that didn't exist, only to created a REAL problem with reliability.
From: ian field on 25 May 2010 15:35 "WangoTango" <Asgard24(a)mindspring.com> wrote in message news:MPG.2665e1aada0cb85098b139(a)news.east.earthlink.net... > In article <ffUKn.73055$Qg5.46409(a)newsfe06.ams2>, > gangprobing.alien(a)ntlworld.com says... >> >> "Baron" <baron.nospam(a)linuxmaniac.nospam.net> wrote in message >> news:hth2v2$a0p$1(a)news.eternal-september.org... >> > Hi Guys, >> > >> > Just for the record here's a few pictures of a laptop power socket that >> > used lead free solder. You can see the erosion caused by poor >> > electrical conductivity of the joint between the center pin and the >> > circuit board. The hole was originally plated through but there was >> > little left of the plating. An open circuit and discharged battery >> > resulted in a non working machine. >> > >> > The images don't show in "ser" check >> > in "alt.binaries.schematics.electronic" >> >> I just got through repairing the accumulation of PC monitors I'd taken >> out >> of service because of lead-free solder syndrome. >> >> Most people scrap them and buy a new one - not very eco-friendly at all! > > And *THAT* is the worse part. > It was a bunch of regulations to fix a problem that didn't exist, only > to created a REAL problem with reliability. > The tragedy is that lead is no longer made into the relatively stable and less bio-available alloy; solder.
From: Baron on 25 May 2010 16:09 ian field Inscribed thus: > > "Baron" <baron.nospam(a)linuxmaniac.nospam.net> wrote in message > news:hth2v2$a0p$1(a)news.eternal-september.org... >> Hi Guys, >> >> Just for the record here's a few pictures of a laptop power socket >> that used lead free solder. You can see the erosion caused by poor >> electrical conductivity of the joint between the center pin and the >> circuit board. The hole was originally plated through but there was >> little left of the plating. An open circuit and discharged battery >> resulted in a non working machine. >> >> The images don't show in "ser" check >> in "alt.binaries.schematics.electronic" > > I just got through repairing the accumulation of PC monitors I'd taken > out of service because of lead-free solder syndrome. > > Most people scrap them and buy a new one - not very eco-friendly at > all! I agree, its a shame, all that nice kit that gets dumped because its cheaper to replace than repair. In my case the pictures were the product of doing a repair. -- Best Regards: Baron.
From: Cydrome Leader on 25 May 2010 19:14
WangoTango <Asgard24(a)mindspring.com> wrote: > In article <htgtgd$b6n$1(a)reader1.panix.com>, presence(a)MUNGEpanix.com > says... >> >> Aside from silver plated or specialty parts in an old scope, is there any harm done >> in using real solder in a RoHS device? >> >> Here's an example. >> >> a resistor mounted through-hole has a bad joint. Normal repair just reheat the joint >> and add more solder. No problem. > > I've reworked a thousand "RoHS" boards with good 'ol 60/40 and have > never had a failure of one of MY joints, or any problems related to > them. The stupid part of all of this is, just how are you going to know > EXACTLY which lead free solder was used to begin with? There a a lot of > formulations, from good 'ol SAC (Tin, silver, copper) to a bunch of > alloys with all kinds of weird stuff in them. So, if you grab a spool > of SAC and the OEM used a bismuth or zinc alloy, what is going to > happen? I just clean up as much of the original solder as possible with > solder wick and put down 60/40 and forget about it. I might also add, > that we have mixed RoHS and non-RoHS parts for years with no failures > due to the tin/lead solder. In fact UPS has destroyed more boards by > running them over than any other failure mechanism. Well this sounds like good news. Thanks for pointing out the solder wick. I don't generally use the stuff, but it's does a good job of removing as much old solder as possible. |