Please allow me to revise my comments:
The TS-7260s are not dead. They were just trying to give me a heart attack.
I have used a number of these boards over the years, and first part of the boot
sequence has always been the same: The red and green LEDs flicker and go off
and then the machine boots.
For the two boards in question, however, the sequence is different: The two
LEDs flash on and off, then the red LED comes on and stays on for 7-10 seconds
before the boot sequence proceeds. In my experience, nothing good happens when
the red LED comes on and stays on, so the first several times it happened, I
killed power almost immediately. Only when I was laboriously demonstrating the
problem to someone else did I give it enough time to get past this new delay
and find that the boot sequence does in fact complete.
So now my question is: What might cause this delay? Is there any way to tell?
The output of dmesg looks nominal, and the console, USB, and Ethernet seem to
work just fine. I have not checked out the remainder of the connectors
(DIO1&2, COM2&3, LCD), though.
--- In "jywmpg" <> wrote:
>
> I got a shipment of several TS-7260s yesterday, and got hard failures on the
> first two that I powered up. When I apply power, the red LED blinks on and
> off once, then comes on and stays on.
>
> On the first board, I plugged a serial cable into the console, a thumb drive
> in one of the USB ports, and a network cable in the the RJ-45 jack. The very
> first time I powered the board up, it failed as described above. Hyperterm
> was connected to the console at the time and showed no interaction.
>
> On the second board, I powered it up with no cables connected and it appeared
> to boot just fine, as the LEDs flickered on and off as normal. I then turned
> power off, plugged in the serial cable, powered on, and the board failed as
> above.
>
> I checked the voltages on the serial line, and they appear to be within spec.
> The TS-7260 power is supplied by a 12VDC wall wart that I checked with a
> voltmeter prior to powering up the first board. All work was done with
> reasonable no-static procedures.
>
> Now I have two boards that refuse to boot, and I am a little gun shy about
> applying power to the rest of the boards. I have initialized a good number
> of these boards over the years using this same procedure without issue.
>
> I plan to file an RMA, but my question to the group is: How does this
> happen? Can a bad serial cable (that appears to be good) kill a TS-7260? A
> more general question is: Is the TS-7260 a robust SBC, or is it fairly easy
> to destroy? These are not the first boards that have failed under fairly
> benign circumstances and I am wondering what other people's experiences with
> this board are.
>
> Regards,
>
> jw
>
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