Electronics Forum | Thu Feb 14 04:40:38 EST 2008 | lococost
You want the backplate set up so that when there's no PCB the wave stands still or moves towards the PCB. When the PCB moves over the wave, it should just pull the wave towards the back (in the same direction as the PCB). This will help reduce brid
Electronics Forum | Thu Feb 07 08:08:20 EST 2008 | scottp
We also use machinists dye. I like to pull a vacuum on the board after wicking the dye under the BGA. It seems to help fill fine cracks. I'll stick it in a warm oven if I'm in a hurry for the dye to dry. Then just bend the board to pop off the BGA.
Electronics Forum | Thu Feb 07 18:19:38 EST 2008 | mobytahoe
We are experiencing corrosion and subsequent pcb contamination from the RTV material used to secure a Power Supply. The degradation takes place over a few weeks. The power supply vendor is balking at liability, our OEM customer is screaming. Anyone
Electronics Forum | Mon Feb 11 02:37:41 EST 2008 | bvdb
Hi Grant, I wouldn't worry too much. If your PCB has a solder mask, just glob the solder on and use solder wick to suck up the excess. A bit of Isopropal alcohol afterward with a cotton swab will make it look like it's been reflowed. Cheers, Ber
Electronics Forum | Mon Feb 11 17:21:40 EST 2008 | larryd
What causes BGA voids over 25%? Have recommended profile for solder paste, hit 237C for 5 seconds and still get a void on 2% of specific BGA in various locations. BGA is FG676, 1mm pitch, on ImAg using lead free paste OM338 on a 6 layer FR4 PCB.
Electronics Forum | Tue Feb 12 04:07:29 EST 2008 | aj
Hi, Have you checked out the BGA datasheet and see what profile is recommended for the BGA ? I use OM338 and there are dozens of recommended profiles for the Paste but you have to consider the components aswell. You state your Peak temp which I w
Electronics Forum | Wed Feb 13 05:56:55 EST 2008 | johnlee9210
Our front panels (where the controls show) for our assembled amplifiers are anodized and we make sure that it is free from oils or other stains prior packing the whole assembled unit. We just use damp cloth in cleaning and sometimes flux remover for
Electronics Forum | Fri Feb 15 06:21:34 EST 2008 | marjorie
Thanks for the comments and advice. The rest of the components have good solderability except for the BGA that fell off. Our production is high mix low volume so the quantity was very small. I'll check the pcb lands next time I run. It could be a con
Electronics Forum | Mon Feb 18 02:08:06 EST 2008 | lococost
4 days seems a lot. You could be losing flux activation causing poor wetting on the enig. Check your suppliers data sheets for paste life. If it was contamination on the PCB, you'ld expect other components to solder badly as well. Try using a bra
Electronics Forum | Mon Feb 18 08:56:44 EST 2008 | operator
It does exist. We used to have one here, but sold it. It was more of a manual process though. You put the assembled board on the work table and then set your cutting blade height. Then you manually moved the cutting blade around shearing off the TH l
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