Electronics Forum | Fri Mar 28 16:27:43 EDT 2014 | hegemon
Lol Dave. Give me a lever long enough....
Electronics Forum | Fri May 22 15:37:23 EDT 2009 | 1smtdude
Depending on the material chosen, it's possible to �rework� underfilled components. However, it's far from a production process. Two steps are usually required. First: remove the package from the PCB. Second: remove the residual underfill from the P
Electronics Forum | Wed Mar 04 22:57:05 EST 2009 | davef
Underfill epoxies may be classified into major groups [Capillary Underfill Manufacturing Development and Characterization for 2nd Level Electronic Interconnect Processes; B Salom�n; University of Puerto Rico, Mayaguez Campus; Dec 2004]: * Capillary.
Electronics Forum | Thu Mar 27 07:56:04 EDT 2014 | rrosera
My company is researching the use of re-workable underfill for use on our avionics boards. We are currently testing Hysol UF3810. The Rework machine we use has a vacuum based removal system witch isn't strong enough to overcome the underfill. We have
Electronics Forum | Mon Mar 29 13:33:05 EST 2004 | Ron W
I was wondering if anyone has attempted to develop a process for the successful removal of a BGA and its underfill. Or, is it the general industry thought process that an underfilled BGA cannot be reworked.
Electronics Forum | Wed Jun 07 07:53:24 EDT 2006 | RLM
This is true but even the so called reworkable underfill takes a lot of effort. We use a loctite reworkable that requires heat to soften the underfill. Once the component is removed we use acetone and a swab to scrub the pcb clean. This can be very t
Electronics Forum | Mon Sep 28 13:03:43 EDT 2015 | dyoungquist
The melting point of the solder itself does not change when you have underfill. If the underfill conducts heat better than air, it will take less heat (and/or less time) from your rework station to get the solder up to the melting point. That makes
Electronics Forum | Wed Apr 27 13:17:10 EDT 2005 | Rush Fan
Is there anyone using an SRT Summit 1100 to perform BGA removal/rework with underfill? I am interested in knowing how their site-scavenging equipment works and would like to here anyones' overall comments. Anyone know if I could see this process in a
Electronics Forum | Mon Sep 28 09:23:03 EDT 2015 | slave2anubis
Hi, sorry for reopening a old thread, but i wanted to ask if there is a way to know at what temperature the solder melts if you have a chip with underfill? I thnk its lower then normal air-fill temperature since the underfill conducts heat better the
Electronics Forum | Wed Mar 25 03:27:13 EDT 2015 | slave2anubis
Hi davef, thank you for sharing this. Yes all manufacturers recommend their products, and i dont deny that they are good but for a small shop like i have i think the prices are a bit high. What i think would be a good technique, is heating the area t
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