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.
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
Where did you apply 12V to? Maybe it can be fixed by changing a component or two.
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.
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.
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 (https://www.mouser.de/ProductDetail/Texas-Instruments/TPS62A02ADRLR?qs=By6Nw2ByBD27zXzxBxM12w%3D%3D)
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! :)
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:
(https://i.imgur.com/heNmmrH.png)
I'm wondering, before I start trying to solder anything. Are there any measurements I could take to confirm where the problem is. I'm most definitely an amateur at this stuff currently so trying to learn where I can.
I measured ~1.9v across pin 1 (GND) and pin 6 (Out according to datasheet although just 'x' in the Kicad file) of U7 when there is 5v applied to the 5v pin of the microcontroller board. It's ~1.4v when usb power is connected.
I'm not sure if that helps to figure out if the component is broken or not.
Umm, you have to measure between pin 1 and pin 3 (GND and VIN). Write down the measurement that goes in. It should be around 4.6V.
Then measure between pin pin 1 and pin 2 (GND and SW). Write down the measurement that goes out. It should be 3.10V-3.20V.
Instead of using pin 1 for GND, for easier time measuring you can use any other GND, for example the pad of EXT1 header.
It is a bit tricky since U7 is small and pin 2 and pin 3 are next to each other at the side of the EXT1 header but I did it today so it is doable.
Okay, I managed to measure Pins 1 and 3, a little tricky indeed. I only got 0.2mV so I think that it's probably dead.
I'll try and replace it and see how it goes. I appreciate the help trying to fix this btw :)