12VDC power issues. started getting flakey, now won't run off 12VDC power input

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k6fjc

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Note I've read: https://theminixforum.com/index.php?threads/j50c-won’t-turn-on.5800/#post-40490 and USB-C seems to power ok,
however, I need the unit running off the 12VDC input.

My symptoms are that the box started randomly powering up and sometimes not at all. Taking it apart, when applying 12VDC last night, LED 3 ended up blinking and the unit would boot. Today, the unit powered off in the middle of the day and I wasn't not able to turn it back on. Took it apart again, no LED 3 activity for 12VDC, activity for USB-C and appears to boot. I have to put it back together.

How do I get this running reliably off 12VDC again asap? I need this fixed in time for reliable use on the 25th.

Thanks,
Mark
 
k6fjc said:
USB-C seems to power ok,
however, I need the unit running off the 12VDC input.
Click to expand...
If USB-C powered is stable, do you have an issue using this?

Are you using the provided PSU?

If not, what are you using?

If you're using a third-party PSU have you tried connecting to the USB-C port with an appropriate cable/connector?
 
As I said, the 12V is required for the installation. Please avoid mentioning USB-C power, I am seeking getting the 12VDC back working.

The PS is nominal 12VDC, typically found in battery operations, in this case a portable JNOS BBS system for ham radio emergency communications in our county. Battery "12VDC" typically ranges from 11.8VDC to 14.1VDC depending on battery charge/load state. This ranges are generally assumed for anything stating "12VDC". If this system doesn't accept that range, then IMHO this is an unfortunate design flaw and we'll have to move on to other micro pcs that do accept the range. Shame, as I spend the $'s on this one, and when it runs, it is a sweet machine.
 
k6fjc said:
As I said, the 12V is required for the installation. Please avoid mentioning USB-C power, I am seeking getting the 12VDC back working.
Click to expand...
Yes, and if you introduce 12VDC to the USB-C port this should power the device!
It was just a suggestion, an alternative method. :rolleyes:

I just thought it was worth looking in to! :unsure:
 
Thank you for the thought and for the quick reply. (argh, as I'm typing this, my power went out briefly, need to go reset things now....
 
Yeah, I know about different ways to get USB-C PD, but adding them is a PITA, plus the extra $'s. The cabinet/mount is wired for 12VDC. Plus, I outboard the USB-C interface, so I'd have to have a way to inject the PD as well as provide a USB-C port. Again, just adds more $'s and takes up space that isn't there.
 
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