Electronics Forum | Mon Mar 24 09:09:40 EDT 2008 | jdumont
Hello all, we have been seeing a lot of issues with broken or open vias on a couple of our bare boards. We have two vendors make these for us and the issue is only with one vendors boards. We have stopped using them until we can figure out what is go
Electronics Forum | Mon Mar 31 14:24:58 EDT 2008 | Mr. Sexy Specs
My Company has instituted a new policy making it mandatory to wear Safety Glasses on the shop floor. Many of my inspectors are complaining that they have suffering from eye fatigue as a result of the new glasses. Has anyone done any tests to see if A
Electronics Forum | Thu Apr 10 12:19:19 EDT 2008 | realchunks
Frazz, Why did this get instituted in the first place? Perhaps instead of making a knee jerk reaction, your company could keep the "dangerous" areas safe with safety glasses. Like around wave or moving machinery and such. You know, put some thoug
Electronics Forum | Fri Apr 04 18:08:26 EDT 2008 | comatose
We are a small OEM that runs a high mix/low volume environment. Typical runs are a couple or five hundred boards, one or two products per day. Currently, we are using a Quad DeHart SLC-20 semi-automatic stencil printer. (alignment is manual, printing
Electronics Forum | Thu Apr 10 08:23:27 EDT 2008 | scottp
If I read you right the issue is mostly with components from one supplier. I'd suggest looking at the components under a microscope. Also, if you have some old pre-tombstoning parts from this same vendor take close-ups of both and compare them side
Electronics Forum | Tue Apr 22 03:46:19 EDT 2008 | fowlerchang
It is CSP reliability issue, which is the mobile CPU from Spreadtrum. All the tests passed and shipped to customer. They assembly them and tested but failed. After they reflow this CSP with hot air gun, some of the boards passed. We got some board
Electronics Forum | Mon Apr 14 16:21:58 EDT 2008 | ck_the_flip
Bottom-side SMT parts CAN and DO go liquidus during the 2nd reflow cycle. It could be that there was enough variability between the 2 different lot code PCBs to cause the parts to fall off. Remember wetting force determines surface tension (the abi
Electronics Forum | Tue Apr 15 21:24:41 EDT 2008 | davef
We find it curious that: * Heat slug pad for Q19 didn't take solder, indicating a pad [board] solderability issue. * Signal termination pads for Q19 didn't flow well, indicating a poor thermal recipe or a pad [board] solderability issue. * Signal ter
Electronics Forum | Wed Apr 16 11:29:31 EDT 2008 | mmjm_1099
Per Tony SMT Here are more photos: Q15, Q16, Q17 represent good transistors on a 1 up board with the transistor locations that are in question. Q13 is a good transistor on a bad 2up board. Right next to it is Q14 a bad transistor on a bad 2 up boa
Electronics Forum | Wed Apr 23 17:40:33 EDT 2008 | dyoungquist
We are a small OEM that also does EMS for local companies. We run our SMT line 10 hours/day 5 days/week and average 2 changeovers per day. We are using a MyData machine in our line. With the proper mix of magazines and feeders, changeover times ca
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