Electronics > Manufacturing & Assembly

Another PCB FAIL!

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DrGeoff:
Just finished stuffing a proto board only to find a short between power and ground. Closer inspection revealed no less than 16 shorts between power, ground and other traces on the board. This one was made by Itead Studio, which I've not had a problem with before. Maybe they've changed manufacturers. Of course, some of the shorts were under connectors and chips. Here's a photo showing a few. Some under U3 are already removed, but the clear shorts under C14 are visible. You can also see a defect in the track along the bottom of the photo.

FreeThinker:
Contact Itead and explain the problem. If they fix it (redo the boards correctly) then all well and good. If not, dump them. No one is perfect, addressing your limitations is the sign of a good company. Did you inspect the boards before assembly?


<Edit Typo>

Kiriakos-GR:
The parts holes looks more than big, the the PCB trace around them nonexistent,
this is another major problem other than the random grounding issue.

Looks like that some one tried to squeeze the PCB size, and he created a mess. 

ejeffrey:

--- Quote from: FreeThinker on August 22, 2011, 12:16:25 pm ---Contact Itead and explain the problem. If they fix it (redo the boards correctly) then all well and good.

--- End quote ---

Not really.  Assuming the board meets reasonable design rules for the service, replacing the boards is not really a solution.  The cost in time and parts of assembling boards that turn out to be defective is much worse than paying a few bucks extra for the PCBs.  If they have consistent QC problems they need to fix the underlying problem: change their advertised design rules to something they can reliably manufacture or fix their manufacturing process.  Replacing defective boards should be considered automatic, but isn't enough.

Those pads do look rather small compared to the hole size, and not really enough given the apparent drilling accuracy, although that doesn't really explain the shorts you show.

mkissin:
That seems really odd. Their e-test should have caught those errors, which are really pretty horrendous. Having said that, was this particular PCB one of the boards that was tested? Their website indicates that by default they only test half of the boards, and all PCB houses will have manufacturing defects occasionally. So, that should guarantee that you get 5 working boards and 5 that "might be OK" (going off information from their prototyping service page).

ejeffrey: You wouldn't have to assemble defective boards with 100% e-testing, which is available from itead for a few extra bucks. This shows the use of such a service. If these boards were e-tested, then that's pretty much negligence.

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