Electronics Forum | Mon Sep 22 22:19:16 EDT 2003 | Dean
Questions: 1. Is this a retail product sold as PCB only? Or is this in a finished chassis / case (like an external modem)? 2. Are the customers damaging only the BGA devices? Like prying them up with a screw driver? What? You can dam and fill
Electronics Forum | Fri Nov 25 09:31:56 EST 2005 | davef
pyramus, First, search the fine SMTnet Archives for previous discussions on BGA shorts. Second, we're still not clear on the issue. * Is the problem with a BGA? If so, please describe the BGA, including any heat spreader * Is the problem with a uB
Electronics Forum | Mon Nov 21 09:23:06 EST 2005 | Amol
With a BGA, how much solder paste are you putting on the pads? sometimes, bridging occurs when there is more solder paste than needed during reflow.....just a thought
Electronics Forum | Wed Nov 23 07:39:14 EST 2005 | chunks
Shorted to the sheild or the BGA balls are shorted? Sheilds move a lot during reflow. If this is the case, place some adhesive or peelable solder mask on either side of the shield and baords to stop it from moving.
Electronics Forum | Sun Nov 20 22:35:26 EST 2005 | pyramus
Hi guys!! Just want to ask regarding the Bluetooth Module. The module has BGA inside shield before production we checked Raw materials no short probems. But after Passing N2 Reflow during normal production the BGA inside module tend to get shorted..
Electronics Forum | Fri Nov 25 00:07:23 EST 2005 | pyramus
Nope actually the whole bluetooth component is a raw part comprising of BGA and chip components in one small PCB wherein this whole assembly is encased in a shield. So basically when we recieve the part we can only see the shield and some minor chi
Electronics Forum | Tue Dec 06 06:14:38 EST 2005 | bwet
Try using some of those new polyimide stencils. They are 8mils thick and can prevent shorting if it is due to solder mask problems or too much paste. http://www.solder.net/technical/tips.asp BWET
Electronics Forum | Fri Nov 25 09:01:24 EST 2005 | Amol
cookson has something they call "cool caps" that reduces the delta T across the component top surface, something you might wanna explore to reduce the delta T even further....FYI, I am not associated with cookson in any way
Electronics Forum | Tue Nov 22 10:12:13 EST 2005 | stepheniii
Have you complained yet to MuRata? You are talking about the same bluetooth module, aren't you. I hope everybody having trouble with module complains to them. I don't believe they put all the cautions and warnings about reducing the deltaT on the da
Electronics Forum | Mon Nov 21 11:21:15 EST 2005 | stepheniii
He's not talking about the balls. He's talking about the sheilding. As soon as I saw the data sheet and all it's warnings, I thought o crap. Anyways the customer had checked all 5 before giveing them to us. After 4 failed. MuRata said the profile we
