Electronics Forum: pcb coplanarity (Page 1 of 5)

Re: BGA coplanarity

Electronics Forum | Wed Jan 03 12:33:37 EST 2001 | Terry Burnette

John, There is one process issue that occurs with the larger BGA packages which have coplanarity near the high end of the .2mm spec.. The defect is commonly referred to as "ball in cup" and "head in pillow". It is an open solder connection whereby th

Stencil and PCB Coplanarity measurement

Electronics Forum | Mon Apr 09 22:40:38 EDT 2018 | jacobidiego

What kind of level have micrometer precition?

Stencil and PCB Coplanarity measurement

Electronics Forum | Mon Apr 09 11:39:32 EDT 2018 | emeto

The easiest way to do without special tools is to use level. Check machine co-planarity on the conveyor rails in both directions(you can do that with rails down or rails up or both). Then check co-planarity on the stencil. If the level shows the sam

Stencil and PCB Coplanarity measurement

Electronics Forum | Fri Apr 06 09:29:20 EDT 2018 | jacobidiego

Hi Experts, I am interested in having a tool or process to measure coplanarity between the PCB pushed-up in the printing process and the Stencil. Therefore having a way to calibrate them.

Stencil and PCB Coplanarity measurement

Electronics Forum | Wed Apr 11 21:00:54 EDT 2018 | jacobidiego

What I mean is.... What Brand and Model should I buy to measure coplanarity between this 2 surfaces that could measure micrometers of difference I think that normal bubble levels are not precise enought for this use ^^

Stencil and PCB Coplanarity measurement

Electronics Forum | Tue Apr 10 16:27:20 EDT 2018 | emeto

Of course, the more accurate the better. However, it might be a challenge to calibrate with really precise one - still better to take your time and do it right. Good luck!

Considerations for placement of Altera ultra-fine line BGA

Electronics Forum | Tue Aug 13 09:31:48 EDT 2002 | ksfacinelli

I am looking at placing a Altera BGA device that has a .45mm Nominal Ball Dia. with a .8 spacing c-c between balls. The PCB will be gold plated so co-planarity should not be an issue. Interested in suggestions that may assist producability when pla

Re: BGA solder failure rate

Electronics Forum | Fri Oct 29 05:23:00 EDT 1999 | Wolfgang Busko

Hi Bart, that�s much to high. If that would happen to me my boss would tear my head off. For improving the yields you must find the cause for the soldering problems. What are the symptoms? What could be the cause for the symptoms? Could be design pr

QFP soldering issue

Electronics Forum | Wed Jan 14 10:07:38 EST 2004 | Patrick

More on QFP soldering issue as per Paul f original e-mail. 1. Problems occured on different PCB's, on different lines using different equipment 2. Flux residue is common in the dimple on the solder. 3. The fault occurred using both "Kester 265" & "Al

BGA faults

Electronics Forum | Thu Aug 17 05:56:39 EDT 2000 | Jacqueline

Hi Folks, Hope yous can help. I'm having a problem when reworking (placing) 40mil BGAs. One side seems to be collapsing more so that the other, resulting in the outer row of balls not properly reflowing and making the connection. This is only happeni

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