Electronics > Manufacturing & Assembly

manufactured JLC PCB trace/connectivity weirdness

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src1989:
I designed a 5V LED PCB (The BigClivicle), which flashes LEDs with a PIC micro. I've so far assembled about 50 of these without a problem.

this one icicle has such a problem: several of the segments don't light at all, or sometimes they light dimly.

initially i thought it i'd cooked the LEDs or the PIC by keeping the iron on too long. replaced them. problem persists  :-//

transplanted the "dud" PIC and LEDs to another PCB, and they worked perfectly.  :-//

thought it could be flux residue; cleaned it off with IPA solvent. problem persists.  :-//

re-did the solder joints. problem persists.  :-//

bleeped the traces out and everything connects where it should, and nothing shorted...  :-//

what can i try next?

DavidAlfa:
Just don't bother saving a cheap pcb?

Kim Christensen:

--- Quote ---bleeped the traces out and everything connects where it should, and nothing shorted...  :-//
what can i try next?
--- End quote ---

You must have missed something. Check it using "ohm" mode instead of the "beeper" mode. A low ohm resistor (33ohm) will "beep" and a high resistance one (100K) will not beep, giving you a false sense of confidence that all is OK when it's really not.

n4u:
Maybe you provide high resolution image and show us. Maybe there is less soldermast and u short sth when soldering ?

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