The Desk of Ladyada -Sneaky Module Under-Pad Debugging
Channel: Adafruit Industries
Date: 2023-01-15

This weekend we were debugging a non-working Feather ESP32-S3 revision: we had to revise this board because the LC709203 battery monitor is EOL and it also never worked very well with the S3's I2C core for some reason. (It works great with the S2, go figure) So we did a big revision push for all our Feather ESP's to use the MAX17048. The S2 revs all worked fine, but the S3 did not enumerate the ROM bootloader, despite being the 99% same pinout and PCB layout. Turns out it was a reflow issue! We'll show how I managed to revive one prototype and common causes. Also, some QT Py BFF prototypes arrived and we put them together, let's check em’ out!
The Great Search - Solder Paste Syringe for Hot Plate Rework
https://www.digikey.com/short/8v23v17z

This week we had to do some reworking of an ESP32 module that has pads on the underneath. When this happens, we have to apply paste using a syringe to the pads and then heat up the PCB and module together with a hot-plate or hot-air machine. Solder paste syringes are super handy to have and have a long shelf life, lets look at some options on Digi-Key and which ones you'd pick based on your rework or solder needs!

#deskofladyada #adafruit #thegreatsearch

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