Instructables

Step 5: Hurray, the solder paste enters the stage.

Now get the solder paste and dab a little in the center of the chips heatsink. Don't use too much and leave a gap around the edges. If you get a little on the outside, remove and try again.

When the chip is placed on the PCB, the paste will sploosh out, which might end up shorting out the chips pins.....so only use as much as is needed.

Next place the chip on the PCB, and tack solder the corner pins to the tinned tracks. Use a multimeter to make sure that there are no shorts.

Be careful with solder paste, it is toxic so wash your hands if you get any on yourself and clean any splatters. Also it should be stored in the fridge when not in use.

When tacking on the corner pins, rely on the tinned trackwork....don't add any more solder. You just need to hold the chip in position. You should have a little play when moving the chip slightly. If you put too much in, remove everything, clean and try again.
 
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