开云体育

Yes, you definitely need a microscope. If you're a hobbyist and you solder often you'll not regret buying a good microscope. Key thing is it has to be a normal optical microscope with at least 15cm~20cm of space between the optics and the work piece. It shouldn't have too much magnification. I believe my microscope has 0.5x and 1x objectives and the eyepieces are 10x. I also have 20x ones but I use them rarely. So a magnification of 5x is pretty good.

I like my microscope so much I do most of my soldering under it. I really like watching how tiny pads become molten.

Regarding this part if you don't have hot air the best way to remove it is either crush it with snips (GENTLY) or put a large ball of solder on a big chisel tip that will engulf the entire chip. Touch it and the moment solder melts it should suck the chip right into the ball of solder. It is very possible the ball will drop the moment you start lifting it so put a suitable shield in place (piece of cardboard) to move it between the pcb and the tip the moment you lift it.

If you have hot air youjust tape everything surrounding the part with kapton, blast it and grab with tweezers when you see under the microscope it became shiny(melted).

Soldering back is not that hard (with a microscope). You solder two opposing corner legs. Then you go after the rest. The easiest is to have a small tip (not the smallest, next size up) and go leg after leg. There is a technique where you do the entire side at once. I always have shorts afterwards.

You'll also need leaded solder in 0.25mm rosin flux wire (0.5mm may be OK) and so called bga flux. Make sure to wash it later (with ipa) as the thing is really corrosive.

I've replaced a tiny switch like that in a nanovna, but it was even smaller and had balls under for contacts. Still it was fine with hot air.

As others say. Be very careful if you choose to crush. Do not cut the legs. You will rip the pads off the pcb. Just crush the chip itself.

Good luck,