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Forum Index : Microcontroller and PC projects : JLC had a bad day......
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9307 |
It happens to us all!  One of the CMM2_G2 boards I got back from them. All the other boards are fine - I checked.   Look carefully at the photos. No, those pins are NOT supposed to be bridged.  I could not work out initially, why this board flatly refused to talk to the cube programmer, no matter what I did. When I put it under the microscope, all was revealed, and it was the "A-ha!" moment. I COULD moan to JLC about this, but it is the first board with any pin bridging I have EVER got from them out of close to 100 CMM2 boards I have had them make since the CMM2 design was released, so it would be a little petty of me, when a dab of flux and a quick drag-solder movement, completely cured the issue, and then the board programmed just fine. I am surprised though, that the AOI(automatic optical inspection) process as part of the factory QC, did not detect this and reject the board. Ah well. It's not a problem in any event. Smoke makes things work. When the smoke gets out, it stops! |
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bigmik Guru  Joined: 20/06/2011 Location: AustraliaPosts: 2914 |
Grogster, You made my heart skip a few beats with the Topic, I currently have a set of boards in the "snail mail trail" on its way to me. Regards, Mick (the Big one) . Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6797 |
In a way it's nice to see that even the big lads can make a c**k up of the job - just like I do. :) The main difference is that I do it all the time... :( Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9307 |
@ Mick - I wouldn't worry. JLC have been VERY consistent and reliable with both their plain PCB's, and also their SMD assembly process. I'm sure your boards will be fine.  I just posted the thread to illustrate that even factory production can get it wrong from time to time. As I said, I COULD moan about it to JLC and send them the photos, but it was mere seconds to fix the bridging myself, so I am not worried about it or ordering SMD assembly from them again. What actually raised my eyebrows more then anything, was that the AOI did not detect it - AOI is usually pretty good at picking up on those sorts of faults. Smoke makes things work. When the smoke gets out, it stops! |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6797 |
That surprised me too. I wonder if the one they used only checked for component rotation or something? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| toml_12953 Guru Joined: 13/02/2015 Location: United StatesPosts: 339 |
You should at least tell them about it. It might be a problem with a wave soldering machine or some other equipment that could be corrected. They can't fix something they don't know about. |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9307 |
You have a point, Tom. But I would have thought that with the number of PCB's they assemble, if there WAS a problem with one of the machines, they would have reports of that by now. But you still have a point. I might do just that in my next order, just for their information. It did not bother me, really. But someone who does not do any SMD work, it would affect them more, as they would be unwilling, I guess, to reflow the situation themselves. Smoke makes things work. When the smoke gets out, it stops! |
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