Tips for removing stubborn, big PLCC chips with hot air?

[Steve Rieck]

I'm trying to remove the GLU from a IICX board without damaging it. Currently "practicing" on the NUCHIP which I don't need. Removed as much solder as I could with wick and put plenty of flux on the pins.

Then attempted to remove the NUCHIP with hot air using all the technique I'm familiar with. Unbelievably stubborn and my temperature is too high to begin with. I don't have the heart to punish what seems like a good un-corroded GLU chip this way.

Any veterans have advice on the safest way to get these big chips off the board? Thanks in advance.

 

[vtgearhead]

I try to use a pre-heater whenever I'm working on a multilayer board. If you bring the entire vicinity up to around 200C it's much easier to convince things to let go when you hit them with hot air.

 

[bakkus]

Start by adding fresh solder - low-melt solder if you have it.
This way you're not battling 30 years of crust at the same time.

I know you said you wicked off the old stuff, but adding solder actually helps distribute the heat among the pins.

 

[YMK]

An IR preheater makes it much easier and safer.

Use flux, hot air and shield surroundings with metal tape.

 

[jmacz]

ChipQuik low temp solder also works.