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I bought a new ATU-10 months ago and I immediately upgraded its firmware to 1.5, ?but did not use the unit since then.

I would now like to fully charge the battery as well as to upgrade to 1.6 firmware. The unit powers up correctly, but nothing happens as I plug the USB-C cable to the unit and to a charger (25W). Nothing happens when I connect the unit to my laptop (Mac): no "USB disk" appears as mounted. The same happens with another USB cable.

Could the unit (or the USB connector) be damaged? Am I forgetting something (e.g. how to put the unit in "programming mode" or in "charging mode") ? Thank you for your patience with my question.?

The unit works fine. It is only the charging and the PC connectivity that (apparently) fail.?

Is this indeed your experience? I would have guessed that a faulty PIC would result in no operation whatsoever of the device... Could I be wrong?
73 de Mike

Hi Mike, I do not have an ATU-10, but looking at the schematic it sounds like the USB power may not be present. This feeds the charging circuit and the PIC associated with the USB interface. The 5V from the USB interface is connected via a PTC fuse. If possible, try to check if there is 5V getting into to the unit from the USB interface and check the soldering on the USB connector.

73, Dave

Thank you, Dave and thank you Al.

UPDATE: I opened the box and try to check whether the USB connectors pin (i.e. from inside) was reading 5V. I did not. So, before assuming that it got detached from the PCB, I tested every single USB-C cable I have.
I found that with one USB-C to USB-A, it works. I cannot figure it out why as there is no logic (Murphy's law at its best).

Upgrading to 1.6, I now have every "." character replaced by a "box" character (i.e. both during the splash welcome screen and during operation). Another mystery.

Thank you for having shared your thought and help!!

Hi Mike, Very strange about the USB cable. I wonder if it is a mechanical issue or the way the USB-A to USB-C is connected. With respect to the display, maybe revert back to the previous version of firmware to see if it shows the previous behaviour. Perhaps David (N7DDC) may be able to comment on this.

73, Dave

Hi, Mike.
Use a USB A to USB-C cable only.
Before programming, the device should be fully charged.?

Look at message #1274 and the replies.
The ATU-10 is missing 2 pull-up resistors on the USB-C jack.
They can be added but it is difficult for my non-surface mount soldering skills. :-)

73 - Dave, N4ELM