New ESP32-POE-ISO - was I sold a second hand unit?

[chrismacp]

Hi,

I recently had to buy a new ESP32-POE-ISO as I mistakenly applied 12v to my previous one for a few seconds and it no longer functions (although LEDs do come on).

After unpacking the new unit I noticed it had an extra component ("570F KE") connecting capacitor C26+ to the black box component (DCDC1 I think). I couldn't find a match online to the extra component "570F KE".

I was wondering if this component was to be expected or if I should return this unit? I don't really want something that someone has modified.

Some images (don't seem to open using [img] tags)

https://drive.google.com/file/d/1ccucp0A1oC0FB8-1nU1VaNSfdpXIjaSX/view?usp=sharing

https://drive.google.com/file/d/1Ahccl6cMLyJu11ljA_Rqvy3IGnk5gCB4/view?usp=sharing

https://drive.google.com/file/d/1dgueAAM4adKMQBRIsOjPSFV30N7dl61-/view?usp=sharing


Note: I didn't purchase directly from Olimex, but another store, in Germany.

[LubOlimex]

No, you are good. This is a factory patch applied in hardware revision M1. It is mentioned in the hardware revision changes:

https://github.com/OLIMEX/ESP32-POE-ISO/blob/master/HARDWARE/Hardware-changes-log.txt

[LubOlimex]

Where did you apply 12V to? Maybe it can be fixed by changing a component or two.

[chrismacp]

Thanks for the response, happy to hear I don't have to send it back

For the 12v issue, I applied it to the 5v pin, no other power would have been applied from usb or ethernet.

[LubOlimex]

Probably U7 died. Maybe try replacing U7 which is TPS62A02ADRLR(SOT-563-6) and see if it'd work. It is not the easiest soldering job but not the hardest either. Hopefully it is the only component that died.

[chrismacp]

Thanks for the tips.

I am not 100% sure which is U7. I added a photo to indicate which one I think it is (yellow arrow) or could it be the white arrow?

https://drive.google.com/file/d/15eo-CIxJKTpJbuQ3NALS_mo5YdbeBfEL/view?usp=sharing

I found the part at Mouser here
 which looks more like the the component the yellow arrow is pointing at.

Once I confirm, I'll go and learn how to solder surface mount components!

[LubOlimex]

You guessed correct. It is the yellow arrow. The component you found at mouser is the proper one, yes.

You can also confirm it if you open the design files with KiCAD and open the board design file. Then it is clear which is U7 and which is L2. The white print label had been moved there due to other components situated nearby. Here is the BRD view: