[WTB] WTB: 4 x Mushkin 991127 (or other DDR400 Reg ECC CL2)

[matsta31]

Apogee Xt ?

I will also be selling an AX 1200, if you ever need more power.....

[Dead Things]

Bump for a friend!

[Soultribunal]

When you say resistors are you talking about doing Surface Soldering and such? Rework?

Not that I am skilled by any stretch of the imagination but I might be able to find you a friend once I have a better idea.

-ST

[Dead Things]

Originally Posted by Soultribunal

When you say resistors are you talking about doing Surface Soldering and such? Rework?

Not that I am skilled by any stretch of the imagination but I might be able to find you a friend once I have a better idea.

-ST

Specifically, I want to replace a zero ohm resistor on a motherboard with a 100k ohm resistor. Also want to add some vario resistors to a few video cards - but that's less of a priority right now.

[Rison]

well, I'm a CET with an HRS certification (high reliability soldering). I'm kind of 22 hour drive away though. Soldering isn't something you can show by typing over the internets. It's like miniature welding, there's a partial art to it.
As for surface mount, it's done via a very expensive soldering station that uses hot air instead of a tipped iron. It's finicky/tricky work that requires an extremely steady hand and a good lit magnifying glass (on an arm) The solder is fine as a hair, and not usually carried by standard electronic shops (around here at least)..
I can offer advice, but it's more of a "i'll show you" type of thing.

[KaptCrunch]

too fine for my eyes Rison sounds if your inside the cpu soldering

[Soultribunal]

Yeah I know exactally what Rison is talking about. I wonder if the rework tools I have can do those little resistors now that I have a better idea what your after.
Give me a few to check out somethings and I'll get back to you.

Rison has probably 20x more experience than me but I am a little more local with a Wells Hot Air Iron and Hakko Station so...

-ST

[zsamz_]

the small resistors are not a problem

when you get to the super small resistors i cant do it lol 1mm x3mm

most important is a good soldering iron and a good tip

and steady hands lol

and lots of practice

just practice on old dead harware you will get the hand of it

after you burn your fingers a few times you will get better

[Xeven]

Any idea on the profile DT? (402, 603, 805 etc). I'd offer my "friendship" but I live a bit far from the center of the universe

[Rison]

well, if you're talking about gear.. weller is probably the best DIY iron out there. They have variable heat stations for $120-$150 range, and you can buy finer tips. If you go for a static solder iron, you're looking in the 25-30 watt range. Make sure you clean the tip + prep areas prior to, and after soldering. Cleaning is the key for a proper solder. Isopropal Alcohol / Isopropanol (99.99% technical grade) + lint free cotton cloth is your friend. It removes the flux after the solder so it doesn't eat away at the tin/lead over time. Most places carry the little brushes to get into the joints properly.
There's lots of stuff you can read online, like using the (often yellow) sponge to shock the tip (to bring heat to it instantly) before applying heat to the weld.. the little sponge isn't for cleaning the tip, like most people think / use it for.
The trick is the solder, you want 67/37 eutetic solder. This leaves a very low elastic point so it doesn't take long for it to set after removing the iron.. very important with fine work if you're using an iron instead of air gun. Most electronic places carry the standard thicknesses, and can order in the finer stuff for some of the resistors you're talking about. Most of the time, the issue is the angle of the soldering iron, and not the actual soldering itself.. trying not to hit everything around it on those tiny boards. That's where hot air is awesome - you can direct it rather easily with little error around the solder itself.
For soldering extremely tiny resistors, it's best to heat the pad with the iron (on the circuit board), then set the resistor on it.. and draw the solder from the resistor to the pad (solder always flows to the heat). This all happens in less than two seconds or you burn the pad/resistor up.. it takes a lot of practice.

There are probably a tonne of online resources, and some books available on methods and soforth.. some good, some bad. Any questions just shoot.