| View previous topic :: View next topic |
| Author |
Message |
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
 Link Posted: Thu Jan 07, 2016 6:37 pm Post subject: soldering on the NEW VDC boards |
 |
|
Anyone tried working on these yet? They are sh*t to re-work, and I'm not blaming VDC but I think they are the new ROHS complaint standards . When there's only 10% lead they do no wet or flow worth a dam. It's like trying to de-solder a lump of Gray chalk . 
I've worked on baked out, 20 year old Electrohome boards with 50K hours that were a breeze, these things are just awful.
|
|
| Back to top |
|
 |
gregstv
Joined: 27 Aug 2007
Posts: 628
Location: Australia
|
| Link Posted: Thu Jan 07, 2016 11:35 pm Post subject: |
|
|
|
Reflow with Tin Lead before rework
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Link Posted: Sat Jan 09, 2016 2:23 am Post subject: |
|
|
| gregstv wrote: | | Reflow with Tin Lead before rework |
yeah and doesn't that suck!
Remove old solder
add new solder,
remove part
remove new solder
add new part.
re-solder
What a PITA, basically doubling the time required 
|
|
| Back to top |
|
|
jbmeyer13
Joined: 03 Dec 2010
Posts: 1135
|
| Link Posted: Sat Jan 09, 2016 3:53 pm Post subject: |
|
|
| draganm wrote: | | gregstv wrote: | | Reflow with Tin Lead before rework |
yeah and doesn't that suck!
Remove old solder
add new solder,
remove part
remove new solder
add new part.
re-solder
What a PITA, basically doubling the time required |
Your soldering work is first rate so I'm sure you'll get through it. If they are new boards are you trying to mod them?
_________________
Projector: Modded 9501LC ULtra- MP VIM, Vold VNB, ETECH LVPS, Silver VIM Cables, HD10F's & a V1 case!
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Link Posted: Sat Jan 09, 2016 9:56 pm Post subject: |
|
|
| jbmeyer13 wrote: | | Your soldering work is first rate so I'm sure you'll get through it. |
thanks, sure didn't feel that way this time but I have to get thru it so it has to be resolved
| jbmeyer13 wrote: | | If they are new boards are you trying to mod them? |
just a refresh since the Simulator boards are typically very high hours.
Will probably wrap this one up and be done with it soon, it's been years and I'm burned out.
|
|
| Back to top |
|
|
cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
|
| Link Posted: Tue Jan 12, 2016 3:41 pm Post subject: |
|
|
If I became President, I'd withdraw the US from RoHS compliance requirements except only for products designated specifically for export. Items made for domestic usage would be exempt from RoHS compliance and our tyrannical regulations on all things lead related would be relaxed to become simply reasonable.
The usage of lead free solder is STILL implicated in the short service lifespan of many kinds of modern electronics.
Since a shorter service life means more electronic scrap entering the garbage and recycling channels, it would be easy to argue
that allowing a little lead back into the solder makes a positive long term benefit, offsetting the cost of recycling by reducing the amount to be recycled.
I have lost count of how many generations of digital projectors our Marquees, Barcos, G70s, etc. have outlasted.
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Link Posted: Wed Jan 13, 2016 5:56 pm Post subject: |
|
|
| cmjohnson wrote: | If I became President, I'd withdraw the US from RoHS compliance requirements except only for products designated specifically for export. Items made for domestic usage would be exempt from RoHS compliance and our tyrannical regulations on all things lead related would be relaxed to become simply reasonable.
The usage of lead free solder is STILL implicated in the short service lifespan of many kinds of modern electronics.
Since a shorter service life means more electronic scrap entering the garbage and recycling channels, it would be easy to argue
that allowing a little lead back into the solder makes a positive long term benefit, offsetting the cost of recycling by reducing the amount to be recycled.
I have lost count of how many generations of digital projectors our Marquees, Barcos, G70s, etc. have outlasted. |
I agree with all that, but I would also add that if you remove the lead limits you need to really clamp down on recycling to make sure all that lead is reclaimed and not dumped into a land fill here it can leach into ground water.
I mean most states already have strict recycling laws on electronics, but the laws need to be universal and carry stiff penalties for lazy asses.
|
|
| Back to top |
|
|
cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
|
| Link Posted: Wed Jan 13, 2016 8:47 pm Post subject: |
|
|
A funny thing about lead is that once it's in the environment, it rapidly oxidized and passivates, and unless you disturb it, it just sits there and goes nowhere. Once passivated, with its protective oxide skin, it is one of the most inert substances on the planet, able to withstand thousands of years buried or exposed and not change much. Lead ornaments have been found in archaelogical digs that are thousands of years old and still pretty much the same as the day they were first buried.
The vast majority of damage done to humans by lead came from people, usually kids, eating paint chips made with paint that contained lead compounds. With that becoming a rare thing these days, lead poisoning instances are WAY down.
There are still plumbing systems in Italy that are (or at least were a few years ago) still in service that were built out of lead pipes, and made during the days of the Roman Empire. As long as the piping's oxide layers are left undisturbed, the amount of lead released into the water is negligible.
The hazards of lead, in passivated form, are dramatically overstated.
|
|
| Back to top |
|
|
CIR Engineering
Joined: 25 Aug 2008
Posts: 4264
Location: Chicago USA & Berlin Germany
|
| Link Posted: Sun Jan 17, 2016 4:31 pm Post subject: |
|
|
| cmjohnson wrote: | A funny thing about lead is that once it's in the environment, it rapidly oxidized and passivates, and unless you disturb it, it just sits there and goes nowhere. Once passivated, with its protective oxide skin, it is one of the most inert substances on the planet, able to withstand thousands of years buried or exposed and not change much. Lead ornaments have been found in archaelogical digs that are thousands of years old and still pretty much the same as the day they were first buried.
The vast majority of damage done to humans by lead came from people, usually kids, eating paint chips made with paint that contained lead compounds. With that becoming a rare thing these days, lead poisoning instances are WAY down.
There are still plumbing systems in Italy that are (or at least were a few years ago) still in service that were built out of lead pipes, and made during the days of the Roman Empire. As long as the piping's oxide layers are left undisturbed, the amount of lead released into the water is negligible.
The hazards of lead, in passivated form, are dramatically overstated. |
Yeah, look at the Roman plumbing in places like Bath England. It still works and has water flowing in it today.
All of the city plumbing is lead pipe and lead mains are still being installed in Chicago today. The water main to our house is lead, but it's 110 years old... I learned that only recently Chicago stopped using lead mains from street to house..
There is a lot of lead in the soil in Chicago. This did come from lead paint chips, but the worst offender was leaded gasoline. The lead emissions came out the tail pipes, settled in the land, and since it's inert it's still there. You can't eat vegetables grown in the soil if you garden in Chicago. TO compound the problem, many people used to use leaded gasoline on their gardens to kill weeds here... I learned all this after we had been eating tomatoes out of our yard for several years
What Chicago does do is add some chemical (I forget what) to the water that causes the lead pipes to corrode on the inner surface. This corrosion makes it so that no lead passes into the water. The trouble is that when they work on the mains, this coating can get knocked off. Until the coating restores, lead levels in city water can go spike way high... we have a really good tap water filter that removes 98% of lead that passes through it in addition to many other chemicals.
I was really glad to see that my son's lead level was only 2 units when he was tested at 1 year old. I was really nervous about this because we also have this old house with lots of lead paint. We vacuum very regularly to keep him from ingesting any.
craigr
_________________
*NEW JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
X-Rite i1Pro2 Spectroradiometer & Spyder Colorimeters *For JVC auto-calibration when Klein & Jeti are not applicable
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
*NEW Light Illusion ColourSpace XPT Version β Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
*NEW OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying 
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Link Posted: Sun Jan 17, 2016 9:42 pm Post subject: |
|
|
|
yeah Lead is totally safe, tell that to the people in Flint Michigan
|
|
| Back to top |
|
|
CIR Engineering
Joined: 25 Aug 2008
Posts: 4264
Location: Chicago USA & Berlin Germany
|
| Link Posted: Sun Jan 17, 2016 10:32 pm Post subject: |
|
|
| draganm wrote: | | yeah Lead is totally safe, tell that to the people in Flint Michigan |
I know Flint, right  My Aunt worked for DOW and my cousins lived there for their early lives.
Lead is bad for everyone, but especially those in their early twenties and younger. Nerve and neuron development are effected; lowering IQ and sometimes psychosis. Not to mention autoimmune diseases.
craigr
_________________
*NEW JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
X-Rite i1Pro2 Spectroradiometer & Spyder Colorimeters *For JVC auto-calibration when Klein & Jeti are not applicable
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
*NEW Light Illusion ColourSpace XPT Version β Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
*NEW OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Link Posted: Mon Jan 18, 2016 7:01 pm Post subject: |
|
|
| CIR Engineering wrote: | | draganm wrote: | | yeah Lead is totally safe, tell that to the people in Flint Michigan |
I know Flint, right My Aunt worked for DOW and my cousins lived there for their early lives.
Lead is bad for everyone, but especially those in their early twenties and younger. Nerve and neuron development are effected; lowering IQ and sometimes psychosis. Not to mention autoimmune diseases.
craigr |
well the good news is Obamster is allocating emergency Federal funding for Flint. Although it should be designated a super-fund site, despite that program being horribly under-funded and years behind schedule
|
|
| Back to top |
|
|
cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
|
| Link Posted: Thu Jan 21, 2016 2:07 am Post subject: |
|
|
The situation in Flint, MI was caused by them switching over to river water, which is corrosive enough to strip the oxide layer off the lead piping, causing active leaching.
It was fine when they fed off of lake water. Which is not corrosive.
The pH of the water has to be taken into account when determining which materials are suitable for piping.
If the water is sufficiently neutral, like it was BEFORE switching to river water, then the lifespan of lead piping is greater than that of any other material in common use as water piping.
And THAT is the reason why lead has been the preferred pipe material for literally thousands of years. Lowest cost of ownership, lowest maintenance requirements. And although heavy, very easy to work with.
Neither copper nor PVC nor any other modern plastic would last as long.
Some grades of stainless steel might, but the cost of such a system woud be prohibitive.
|
|
| Back to top |
|
|
|
|
Forum FAQ
Search
Memberlist
Photo Albums
Register
Profile
Private Messages
Log in
