I love optical illusions, but I can't get that one to work for me.
Yeah, the top layer separated and buldged up about 25 mils. You can see the glass weave in the separated part, so maybe a layer actually split apart.
It was hard to photograph the 3D effect, and this shot was about the best.
John
Dunno, but they claimed their plating is correct (inner trace), trace widths within tolerance, and no contamination (is really copper) but the resistance of the traces was 50%-100% high. No further explanation => no further business.
We used to preheat some boards to prevent blistering in the reflow oven. Some boards still had problems. As soon as anything happened, we would preheat & run all the blanks through the oven to see if any others were bad.
-- Politicians should only get paid if the budget is balanced, and there is enough left over to pay them.
Ah, the Free market in action! ;-)
Hope you can find good product! Rich
Yep. Voting with one's feet is powerful. Look at what's happening to millionaires in NY and NJ. Their feet have moved along with their millions, and the politicians are shocked! ...just shocked!
Nah. They'll go to China, until the next disaster.
I'm sure this was done to both PCB and components in the early days, 24 hours in an over at 120degsC? BICBW
Early days? It was still being done with surface mount boards 10 years ago. I think we used 95°C to prevent moisture from boiling and 12 to 18 hours bake to prevent damage, but it was nine years ago today when I left that business.
-- Politicians should only get paid if the budget is balanced, and there is enough left over to pay them.
I was thinking of flow soldering which is perhaps a slightly more traumatic experience temperature wise for the PCB.
Perhaps its easy to forget that epoxy absorbs water!
Some people have no clue. Add in that were did engineering to order, and some boards were in stock for months or even years before being built. Even though they were stored in an air conditioned stockroom, it didn't have 0% humidity. (like a winter in Alaska at -20F)
We had very few through hole boards left in our product line, so those were hand soldered. We had a new Heller reflow oven that stored the profile for each board. That minimized the heat cycle to what was needed for proper reflow, without damaging the board.
-- Politicians should only get paid if the budget is balanced, and there is enough left over to pay them.
Had the same problem from some stuff out of Canada. Excessive moisture was our culprit. Short run product and had to get them out, so we cooked them for a=20 couple of days at ~130F and went with them. Seems to have helped.
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