Robert Rolf wrote: > Padu wrote: > > >>From: "Spehro Pefhany" >> >>> >> >>Sorry, I should've said. I'm looking at it with a 100MHz oscope, and the >>chip (PLCC package) is soldered to the board. I don't have a desoldering >>tool for this type of chip, so removing it from the board I believe will be >>very difficult. > > > Not really. > Get a paint stripper hot air gun. Make a air directing funnel out of > aluminum foil, or plumbing parts, to get a smaller diameter hot air blast. > Carefully bring the running stripper up to the chip on the board (board held up side > down). The solder will melt on all pins very quickly and the chip will > drop off the board. (you may need to tap it). > Be VERY careful to come in quickly and pull away > quickly so as to not overheat the other parts and traces. > Should take all of 5 seconds with a preheated stripper. > Or better yet: Get a a hot air gun (just like the paint stripper one, only better) with air flow and temperature control. We use one at our company as the main SMD desoldering tool in hardware development all the time. Both air flow and temperature are digitally controlled, so overheating is quite impossible. Well, as long as you don't get impatient and choose the temperature too high... Our failure rate is so low I can not remember the last time anyone lost a chip due to the air gun. Florian -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist