[sdiy] More SMT

[dan snazelle]

On Apr 14, 2013, at 11:53 PM, Scott Gravenhorst wrote:

> 
> This is regarding a video which depicted using a Schmartboard to solder a 64 pin 0.5 mm
> pitch TQFP package.  The video showed a fine point soldering tip being used and the
> process was to use the point of the tip to push solder already on the traces leading to
> the IC pins.
> 
> I do not have such a soldering tip, but I did have a good quality small chisel tip (I'm
> guessing 3/16" wide).  
> 
> I first put paste flux on the Schmartboard with a toothpick.  Just a slime coating.  Then
> I put the IC onto the board and after several attempts got it lined up.  It's tiny stuff
> for me, so I had to use a magnifier (telescope eyepiece in my case) to make sure that the
> IC leads lined up with the traces and that all were going to connect properly.  
> 
> I taped the board onto my desk with masking tape.  I then taped the IC to the board once
> I had it registered correctly.
> 
> I then cleaned my iron well and applied a very small amount of solder to the iron and
> dragged it while heating both the board traces and the IC pins.
> 
> Of course there was a small amount of "too much solder" which made bridges.
> 
> I wiped and cleaned the soldering iron as much as I could and re-dragged the same places
> on the board.  This caused solder to come out from the bridges and go onto the PCB
> traces.  I used the magnifier to look at the solder job and it looks clean.  I will "ring
> it out" tomorrow to see if I need to use solder wick.
> 
> -- ScottG
> ________________________________________________________________________
> -- Scott Gravenhorst
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informative post! can you explain how you taped the chip down? what kind of tape? and did you put it over the chip or behind it?

thanks