Stubborn solder won't leave hole!

[mockingbird]

Re: Stubborn solder won't leave hole!

I've reached the conclusion that for really difficult spots, like an IPM off a plasma, the only way to do it is with a vacuum-desoldering gun or a high end desoldering gun... There's simply too much ground plane and the difficulty is compounded by the fact that the solder typically used is a really stubborn RoHS alloy...

And even with all that high end equipment, you still need to heat the IPM for a while before even attempting.

I've found that ChipQuick is really _REALLY_ expensive for what it is, and the only kinds of people I could see using it are those who need it for really-high end custom jobs where typical tools won't work.

[severach]

Re: Stubborn solder won't leave hole!

A paper clip has the right shape but is the wrong metal. Solder will stick to it. A paper clip bends too easily. You also don't get to choose the diameter of the paper clip so it won't work when the board makers match the hole diameter to the lead diameter.

Using the butt end of a drill bit solves all these problems. Chuck the drill into a pin vice to keep the sharp end from drilling you.

A vacuum desoldering tool will destroy as many pads as a soldering iron. Hot air is the great equalizer. Heat the board up to 150*C and it matters not how big the plane is. You can heat with air all day long and not damage anything.

[Ltank]

Re: Stubborn solder won't leave hole!

I am build a DIY Preheater. Will cost about 250 but is CPU controlled optoisolated SSR,
Heat sink, 1300 Watt Milwaukee heat gun element, 23 CFM 110vac fan, digital readout
Use industry standard 3°C/sec Preheat to 150°C. This should help alot. When finnished I will have on a post I already started