Glowforge Pro stops working mid way thru a job... now its not firing the laser anymore

Technical
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I am in need of a helping hand as my GF Pro died a few weeks back and I can’t afford to send it in to find out that I also can’t afford the cost to “fix” it. I am ultra handy and have built a DIY laser previously (Buildlog 2.0) so I am confident that if I can identify whats wrong I can find a way to fix it.

Is there someone whom can read my machine logs and let me know if anything jumps out as being a true trouble spot?

Logs-TRY-637-20200821-054833.zip (1.2 MB)

2

In file “@400000005eea6aa110e82fa0.u”, there are a large number of I2C communication bus failure entries:

2020-08-03_02:12:32.82461    1457827 ERROR: i2c_transfer: ioctl failed (110: Connection timed out, src/i2c.cpp:26)
2020-08-03_02:12:32.83577    1457834 ERROR: Head I2C communication alert (src/hw_task_messages.cpp:333)
2020-08-03_02:12:32.83580    1457834 ERROR: Board I2C communication alert (src/hw_task_messages.cpp:322)
2020-08-03_02:12:33.33462    1458337 ERROR: i2c_transfer: ioctl failed (110: Connection timed out, src/i2c.cpp:26)
2020-08-03_02:12:33.84547    1458848 ERROR: i2c_transfer: ioctl failed (110: Connection timed out, src/i2c.cpp:26)
2020-08-03_02:12:34.35462    1459357 ERROR: i2c_transfer: ioctl failed (110: Connection timed out, src/i2c.cpp:26)
2020-08-03_02:12:34.86461    1459867 ERROR: i2c_transfer: ioctl failed (110: Connection timed out, src/i2c.cpp:26)
2020-08-03_02:12:35.37666    1460379 ERROR: i2c_transfer: ioctl failed (110: Connection timed out, src/i2c.cpp:26)
2020-08-03_02:12:35.88462    1460887 ERROR: i2c_transfer: ioctl failed (110: Connection timed out, src/i2c.cpp:26)
2020-08-03_02:12:36.39462    1461397 ERROR: i2c_transfer: ioctl failed (110: Connection timed out, src/i2c.cpp:26)
2020-08-03_02:12:36.40584    1461402 ERROR: fused_temp: could not read board temp sensor (src/sensor_task_peripherals.cpp:397)

The “Head”, “Interconnect”, and “Board” all share the same I2C bus. A problem on one board or connector will likely impact them all. I put together a description of the I2C buses on the Glowforge, if you’re interested in the details.

First thing I would inspect is the ribbon cable connected to the head. That is notorious for wearing through due to the rough underside of the black panel that “protects” it. That cable carries the I2C bus to the head, and open/shorted bus lines would be problematic.

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