4 years ago.
Issue with board manufacturing?
I just received my mbed LPC1768 from Sparkfun. Tried downloading a program that blinks all 4 LEDs and it works fine. That's when I noticed what looks like an extra SMD component soldered with LED1. Is it supposed to be there? Is it a design revision, a sloppy fix, or a manufacturing flaw? Should I exchange it for a new one? I don't want to run into potential problems with it later.
It is white in colour with silver tips, so it's definitely not packing material. Tried tapping it gently but it doesn't move. It looks like an SMD resistor with one end soldered to one of the LED pads. The side facing up is coloured white, so it must be the bottom part of the component. The other end of the component doesn't seem to be soldered onto anything, but looks like it's touching the board. It's definitely not on the picture shown at Sparkfun: https://dlnmh9ip6v2uc.cloudfront.net/images/products/9/5/6/4/09564-02.jpg
Here's a picture of the board with the component encircled:
4 years ago.
That looks like a stray resistor has dropped on prior to reflow. Definatley looks like it shouldn't be there. From the image it doesn't seem to contact anywhere but the LED. Should be ok to just wipe it off with an iron and forget about it.
3 years, 12 months ago.
Agree with Maverick War's analysis. It is a stray "extra" resistor, and so should be possible to remove it, possibly even without an iron, as it isnt soldered to any actual SMD pads.
As it was "extra", it wouldn't have shown up in production test, and those 0402 components don't exactly stand out when misplaced on a whole panel of mbeds!
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