Remove/resolder TQFP

[alank2]

I've got a friend who has a bunch of pcbs with the tqfp64 180 degrees rotated from what it needs to be.  He is going to get hot air to remove the chip.  I've done this a few times, but he has around 100 of these to do.  I think he is planning on using hot air to remove the chip, and then resolder it manually.  Is that the best way?  Can you use hot air to remove it, add flux, and then use hot air to resolder it?  Any other tips?  Would a preheated be of help or not much?

[Armadillo]

Invest in the hot air with the QFP type nozzle. This IC is with the leads, so its much easier than the leadless IC.
such quantity, I will go for solder QFP stencil to apply the paste and oven all the boards. Its much easier, predicable and faster.

[Cupcakus]

All you need is the air, other tools can help a bit, but you can just throw flux all over it, hot air it off, wick clean the pads, reapply flux and solder to the pads then hot air it back down, it's very easy.

You can lookup any Louis Rossmann repair videos on YouTube as this is all he does every day.

Of course the proper way to do it is to use paste and a reflow oven with the proper temperature curve, that will take longer and cost significantly more.

[Lunasix]

I've done this on a batch of about 50 boards on which the processor (tqfp 100) had an earlier date code, and blocking errata, than the processor used on the prototype. I remember it took less than 5 minutes to remove the bad processor and to solder the new one. For this, I always use a simple nozzle (2mm) : move rapidly all around the processor, works with all sizes of tqfp, I don't like specific nozzles, I don't see nothing and never know when it is hot, never had succes with those things. To solder, a simple iron, solder and desoldering braid.