When Soldering Doesn't Fix It: Swap the MCU

May 29, 2026 · 7:35 PM UTC ·8 min read · 0 reactions · 0 comments · 29 views

TL;DR · WeSearch summary

The article discusses a hardware debugging technique that involves swapping the microcontroller unit (MCU) to resolve persistent issues with an I2C bus. After extensive troubleshooting, the author discovered that moving the peripheral to a different MCU allowed the system to function correctly. This experience highlighted the importance of considering MCU portability as a diagnostic tool in embedded systems.

Key facts

▪The author faced a persistent issue with an I2C bus that refused to acknowledge devices despite thorough troubleshooting.
▪After swapping the peripheral to a different MCU, the system successfully detected devices, revealing a defect in the original MCU's GPIOs.
▪The experience emphasized the value of using portable firmware as a diagnostic tool in hardware debugging.

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Original publisher	DEV.to (Top)
Canonical URL	https://dev.to/aliaksandrliapin/when-soldering-doesnt-fix-it-swap-the-mcu-f58
Publication time	Fri, 29 May 2026 19:35:51 +0000
Retrieval time	2026-05-29T19:50:03.108Z
Last seen	2026-05-29T19:50:03.108Z
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Opening excerpt (first ~120 words) tap to expand

try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3871018) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Aliaksandr Liapin Posted on May 29 When Soldering Doesn't Fix It: Swap the MCU #embedded #zephyr #iot #debugging A hardware-debugging technique that uses your portable firmware codebase as the diagnostic tool. Plus the deeper bug it exposed once I got past the hardware wall. I spent a week chasing an I2C bus that refused to ACK. By the end of it, I had soldered the breakout, replaced every jumper, swapped chips, and verified every pin assignment three times.

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