repairing_adafruit_grand_central
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repairing_adafruit_grand_central [2021/12/01 11:58] sausage created |
repairing_adafruit_grand_central [2021/12/01 22:44] sausage [Fault finding] |
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| I collected the post and opened it up. Really lovely board, and a stack of pinouts and features. The board sports a SAMD51P20A microcontroller at 120MHz. It contains 1MB of flash and 256KB of RAM. There are 70 pins available, 15 of these are analogue. It uses UF2 which is also what the Raspberry PI Pico uses for programming. You can see all the features here: https://learn.adafruit.com/adafruit-grand-central | I collected the post and opened it up. Really lovely board, and a stack of pinouts and features. The board sports a SAMD51P20A microcontroller at 120MHz. It contains 1MB of flash and 256KB of RAM. There are 70 pins available, 15 of these are analogue. It uses UF2 which is also what the Raspberry PI Pico uses for programming. You can see all the features here: https://learn.adafruit.com/adafruit-grand-central | ||
| - | I knew the board was basically dead as a doornail, so I plugged in a micro-usb cable from The Grand Central to the PC but no LEDs lit up, and there was no activity on the PC. | + | I knew the board was basically dead as a doornail, but I plugged in a micro-usb cable from The Grand Central to the PC but no LEDs lit up, and there was no activity on the PC. |
| The board is all surface mount and so my first challenge was that I don't have much in the way of tools for surface mount. My soldering iron tip is like a sausage compared to the components on this PCB, no soldering tweezers or hot air station. | The board is all surface mount and so my first challenge was that I don't have much in the way of tools for surface mount. My soldering iron tip is like a sausage compared to the components on this PCB, no soldering tweezers or hot air station. | ||
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| ===== Fault finding ===== | ===== Fault finding ===== | ||
| - | My first step was to test if I could read +5V at the micro USB connector. Yep, 5V. So that rules out a damaged connector, or not being connected to the PCB. | + | My first step was to test if I could read +5V at the micro USB connector. Yep, I had 5V there at the pin. So that rules out a damaged connector, or not being connected properly to the PCB. |
| The next was to trace the 5V line. From the USB 5V pin, a trace ran through a small fuse. Testing the fuse with a continuity test, that was fine and I got 5V on either side of the fuse. | The next was to trace the 5V line. From the USB 5V pin, a trace ran through a small fuse. Testing the fuse with a continuity test, that was fine and I got 5V on either side of the fuse. | ||
repairing_adafruit_grand_central.txt ยท Last modified: 2022/01/01 05:28 by sausage
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