Much obliged for the responses so far.
I should mention that the chip next to the "
05" SOT23-6 devices is an SMPS synchronous buck controller MP1657 with two internal MOSFETs. One internal MOSFET is doing the function of the free wheeling diode in a normal buck converter and the other is the "switch" in a normal buck converter. I have no idea what the external SOT23-6 "
05" devices are, but I do not think they can be operated by the MP1657 (for which I append the datasheet.)
On other places on this PCBA there are linear regulators near the SMPS presumably to further regulate the output of the SMPS. There are a total of 6 SMPS and 2 Linear regulators on this PCBA not including the two
05 devices. Cray-cray. See new photos attached for more detail.
https://en.wikipedia.org/wiki/Buck_converterAlso, your are correct, that
IS a FLASH device. This PCBA is the main Linux Processor PCBA of a Reolink RLC-510WA IP Camera. I think it has both NAND and NOR Flash onboard.
So the black thing is likely a crystal then. Good observation with the caps and the proximate FLASH device. I don't think it is an orientation sensor but I suppose it could be a reed switch or a shock sensor. I will stick a scope on it if I get the PCBA working again, and update this thread with the result. The MP1657 has failed and I ordered a new one today. I was trying to determine what the
05 devices were in case I also need to replace them. Since they could be FETs I was reluctant to probe them without knowing the pinout.
More info here:
https://ipcamtalk.com/threads/reolink-hardware.68214/