Electronics Forum: bga failure heatsink (Page 1 of 29)

bga warp

Electronics Forum | Wed Sep 11 23:20:44 EDT 2002 | scottefiske

Profiles are absolutely the first course of action to validate. A few additional questions would be: * Moisture can cause warping as well, verify the manufacturers recommended handling procedures were followed. * Where is the suspect BGA located

Bga failure

Electronics Forum | Tue Sep 26 16:44:18 EDT 2006 | df

All, We have a board that has failed at burn in. There is a 672 BGA on the board. When the test guy presses down on the BGA the board will pass ! What am I looking at here? Board finish is ENIG - could this be black pad / what should I do to diagn

Bga failure

Electronics Forum | Tue Sep 26 18:06:13 EDT 2006 | russ

could be black pad, or it is just bad reflow profile that did not get all balls soldered down. OR it could be a planarity issue between BGA and fab during assembly. Can we assume that this is proven design? Somewtimes in new design touching a BGA

Bga failure

Electronics Forum | Mon Oct 02 19:04:53 EDT 2006 | DC

We had a issue on the SBGA and found stress built up at the corner of the SBGA after cool down to room temperature. It is confirmed by the warpage analysis. I expected that the stress caused by the heat spreader and the epoxy to the copper frame. O

Bga failure

Electronics Forum | Mon Oct 02 20:17:38 EDT 2006 | davef

The different coefficient of expansion of materials used in some BGA can cause warping issues. We've talked about this previously on SMTnet. Search the fine SMTnet Archives. For instance: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=2

Bga failure

Electronics Forum | Tue Sep 26 18:29:15 EDT 2006 | stepheniii

Profile, profile, and profile. If you can sacrifice a board, the best is to drill a small hole into the a ball from the other side of the board and insert a thermocouple there. I'm 99.99% certain you won't be able to sacrifice a board. (who can the

mirco bga stencil opening

Electronics Forum | Wed Oct 02 15:08:37 EDT 2002 | Eric

See Fiske first line. I'd bet You are bending or catching the assembly in the ICT. How many probes at 8OZ each? do you use on that ICT? 800 probes = 400lbs. See "Flexure induced failure of BGA solder joints" by Compaq Houston TX

mirco bga stencil opening

Electronics Forum | Thu Sep 12 10:45:29 EDT 2002 | pbarton

We have used a laser cut stencil 0.15mm (0.006") thick with 0.3mm (0.012") square apertures radiused in the corners 0.06mm (0.0025") to aid paste release. This approach with the (type 3) paste we use has proven successful on thousands of devices plac

BGA solder failure rate

Electronics Forum | Thu Oct 28 13:36:14 EDT 1999 | Bart Smith

I am a design engineer and have a circuit board design with a 292 pin BGA on it. The board manufacturer is experiencing a failure rate of about 2.8% on the BGA device due to soldering problems. This is my first experience with BGA. How does the 2.

BGA failure after coating

Electronics Forum | Wed Sep 30 11:32:45 EDT 2009 | pbarton

What type of conformal coating are you using and are you allowing the coating to migrate under the device in question? If you are allowing the coating unbder the BGA the problem could be CTE of coating is much greater than that of the BGA balls/sold

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