Electronics Forum | Tue Sep 14 10:54:37 EDT 1999 | Scott Davies
| Can anyone out there pls enlighten me on how to solve chip tombstone defects. | I am running a board with a lot of 0603 chip. i had fine the profile and the alignment, but it still happen randomly on the board itself. Is there any other way to sol
Electronics Forum | Mon Aug 17 02:50:44 EDT 1998 | Bob Willis
| Have an SRT w/preheat, 18 layer board all copper, 456 BGA needs to be removed and replaced. The manufacturer is Chip Express and during reflow it warps up or down. Causing either opens or shorts on the corners. I was using gel flux with multiple
Electronics Forum | Thu Aug 03 11:32:44 EDT 2000 | bzark
Any opinion on what size aperture and stencil thickness is most optimum for Land Grid Array 1.27mm pitch with .6mm pad using SN/AG NC solder paste?
Electronics Forum | Mon Nov 01 07:39:49 EST 2004 | Bob R.
Yes, you can place a BGA in flux and get good reflow. However, depending on BGA type and size you should expect a yield loss due to coplanarity issues. Having the paste on the pad definately helps your yield.
Electronics Forum | Fri Sep 09 09:58:54 EDT 2005 | gregcr
Hi all, we are placing some of the 0306's (0603 size parts with the contacts down the long side of the part rather than on the ends). We are having quite a lot of tombstoning. The placement is dead on and the pad layout is per the mfg specs'. Any
Electronics Forum | Thu Mar 09 15:04:41 EST 2006 | geocominc
Please advice how can we reduce a delta T of 40 degres between pads with a seven zones reflow for a LF Assy. max 255 min 215 board size 3x5 inches.
Electronics Forum | Mon May 20 15:58:55 EDT 2013 | sevenzero
Did you try a thinner stencil? More pressure and speed in the printer? What size is the QFN? Maybe the aperture needs to have a + in the center?
Electronics Forum | Wed Jul 16 23:47:50 EDT 2014 | ericjiwang
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Electronics Forum | Tue May 23 03:43:22 EDT 2017 | zsoden
Oh wow that is very useful insight! I will remove and check next time we fire up the machine! How did you know the factory size of the intake hole?
Electronics Forum | Thu Sep 20 07:22:02 EDT 2018 | proceng1
how many parts are you looking for? Certain sizes of SMT? You said you have boards, so you'll need parts that fit the pad layouts of those boards. Also, where are you located?
