AmigaActive (123/1728)

From:James J. Hamrick
Date:3 Jun 2001 at 15:29:19
Subject:Re: "Cold solder?" on Symbios 53c710 on BlizzardPPC

On 23-May-01, you wrote:

>
> --- Rangel Badillo Daniel
> <drangel@monterrey-newyorklife.com.mx> wrote: >
>
> Does anybody
>> know what this "cold soldering" means? Is there some
>> king of soldering
>> material that's resistant to high temperatures? Is
>> there a special
>> procedure to perform this "cold soldering"? Has
>> anyone experienced such
>> a problem? Sorry for my BAD english .
>
>
> As far as I know, "Cold Soldering" is just like normal
> soldering just the solder used has a much lower
> melting point than normal solder, thus you can use a
> tempreture controlled soldering iron to do the
> soldering at much lower tempretures. This is used in
> situations where the object being soldered is
> tempreture-sensitive (I will ask a lecurer at uni if I
> am correct here!).
>
> Anyhow, is this chip surface mounted? if so have this
> teche' who is doing your soldering to remove all the
> old solder, and then resolder it with his own. The
> only problem is to get all the new solder flowing
> around the pin's correctly, but if he has soldered it
> before I'm sure he can do this.
>
>
> Regards
> Glyn Astill

Cold Solder joint is a normal solder. It has heated and cooled to a point
that it gets a grainy and dull appearance, if can see breaks forming in the
connection. It happens to more things than you would normaly think, it
usually causes things to work for short periods and then quit until it
cools, and or intermitant stuff. For example Rca tv's that the picture
starts getting fuzzy, then the picture starts moving downward and then
turns off. All because of one cold solder spot under the tuner.

He may have just missed the one little spot that causing it.

Simple to repair , just touch up with new solder and about 35 watt iron.
Quickly as possible as 35 watt can harm chips. 35 is my fav, 15w - 40w is
possible range.

Good luck,
James

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