lol My turn with M1ATX / no power off

**kraft** · 02-16-2006, 06:00 AM

Argh my M1 ATX is very tricky

In the beginning this psu was a replacement of a morex fried psu after 1 year of use.
As the morex psu was designed for strict 12v, i find it survived well...so back to the M1 ATX...

It's behaviour is really funny.
At home using the morex inverter for converting AC to DC and plugging it to the M1 ATX every runs fine, it power up the board and power down as it should.

In the car everything seems haunted defying all the laws of physics

The M1 ATX switches on the motherboard as it should...but against any predictions it never switches off. I tried anything that could be possible, even unplugging the ignition signal wire but the M1 ATX ignores this event.
I also unplugged everything coming from the amplifier, the usb, the vga too leaving the unit with it's simple power plug...

Actually i'm suspecting electrical noise being able to distract the M1 ATX from it's tasks

**Moneyfink** · 02-16-2006, 06:17 AM

do you use minlogon?

**kraft** · 02-16-2006, 07:50 AM

No it runs with linux but unfortunaltely this has nothing to do with the software just because i also tested without HDisk in attempt to eliminate element after element to narrow the searching spectrum in addition if it was software trouble, this would also happen at home while using the AC/DC inverter

**kraft** · 02-21-2006, 10:08 AM

So i have news...bad news...my M1 ATX is probably dying so RMA rules applies, there's no escape.

The timings are no more effective and it works like a dumb psu except the fact that this psu doesn't send anymore the pulse required to stop the motherboard or the pulse is not long enough anymore and the psu ignores the ignition signal due to an event that i ignore as the wiring remained the same.

I can add that yes, the M1-ATX works right with a pc psu at home

I don't know what can be deducted with this but this has a relation, maybe the signal from any pc psu is providing a kind of frequency to the micro controller that it recognizes better than a straight power from a battery ?

**piabu** · 02-21-2006, 10:16 AM

Originally Posted by kraft

In the car everything seems haunted defying all the laws of physics

The M1 ATX switches on the motherboard as it should...but against any predictions it never switches off.

I noticed something similar.
M2-ATX feedback - ACC line

Try simulating an ignition-off by grounding the ignition sense line after disconnecting it from the 12V.

**kraft** · 02-21-2006, 01:12 PM

I already saw this thanks but i won't try anything which is not clearly indicated in the manufacturer's manual. It's enough that the psu failed and doesn't works as it should.
I related this only for information, not to troubleshoot a faulty hardware due to some internal failures