On 09/01/14 18:06,
sels...@gmail.com wrote:
> If it's something like just replacing D9 I'd opt to do that myself, if it's a problem with a bga or the raw pcb that's obviously less likely to be fixable.
Update on this, D9 on my board has L4Z marking. Any information I can find suggests this is a BAT54, not the BAT54C that it's supposed to be which would be marked L43.
The BAT54 is a single diode between pins 1 & 3. Pin 2 being not connected. Observation with something as simple as a multimeter is that I have battery voltage at pin 2, but not at pin 1. Further investigation with a diode tester shows that it's not a BAT54S either, pin 2 really does appear to be completely isolated.
My board unsurprisingly loses it's date and time across a power cycle.
So I replaced D9 with a BAV70 which was the closest pin-compatible part I had available. It's not ideal as it has a higher voltage drop than the BAT54C.
My board now retains the date/time across a power cycle.
Conclusion: either someone ordered the wrong part, assuming all BAT54* parts were identical, or someone loaded the wrong reel onto the placement machine. I suppose it's also possible the diode manufacturer mis-labeled the reel, but either way it's likely to be a simple human error.
It's relatively simple to fix for those of us not worried about the warranty. That said, it's a manufacturing defect, so I'd be expecting CircuitCo to cover the return costs if I was doing an RMA.