Electronics Forum | Mon Jun 06 07:14:21 EDT 2005 | pci
We find it impossible to remove the glued chips > like the CPU and the UEm ICs in Nokia Mobile > Phones. They are both surface mount devices and > glued with some chemicals we think. Any help is > most needed in this matter. May we know what pr
Electronics Forum | Sun Jun 05 13:42:16 EDT 2005 | amigo
We find it impossible to remove the glued micro-BGA chips like the CPU and the UEM ICs used in Mobile Phones. They are both surface mount devices and glued with some chemicals we think. Any help is most needed in this matter.
Electronics Forum | Mon Jun 06 04:36:44 EDT 2005 | rlackey
It's not underfill is it?
Electronics Forum | Wed Nov 08 05:19:28 EST 2006 | amigo
It's not underfill is it? Sorry, but i don't know what is underfill, if you mean BGA, yes it is BGA !also sorry for very very late reply
Electronics Forum | Wed Nov 08 05:21:10 EST 2006 | amigo
at present we try to do it with hot-air gun adding flux below the chip while heating. but in most cases the PCB gets damaged while doing this. sorry again for late reply.
Electronics Forum | Wed Feb 26 19:09:20 EST 2003 | russ
We use itty bitty drill bits in these cases. You can get one from your PCB supplier. Be careful they break easy. Russ
Electronics Forum | Wed Feb 26 21:21:34 EST 2003 | davef
Try this: * Lay the board onto a solder pot with the via in question on the heat. * Push the wire into the via. * Step back and pat yourself on the back. Since you probably have components in the area of the via that you don't want to cook, try a va
Electronics Forum | Fri Feb 28 01:25:44 EST 2003 | MA/NY DDave
Hi Wow, Sounds like a neat problem. As an other idea try inserting the largest wire you can get in the hole and heating the free end to wick solder up the wire away from the hole. I probably like the solder pot with a small nozzle the best so it h
Electronics Forum | Wed Feb 26 18:48:01 EST 2003 | kennyg
I'm trying to solder a 0.011" lead into a 0.015" +/-0.003" hole. Stop laughing please. This is normally possible with difficulty, except if the lead is removed and the attempt is made to re-install a lead. Anyone have thoughts on how to remove nea
Electronics Forum | Fri Jun 18 12:51:58 EDT 2004 | JD
Just curious if anyone has had any problems because of using acetone to clean flux off boards or parts. Is acetone an acceptable flux remover for re-work? What are the pros and cons about using acetone Thanks in advance, JD
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