07-11-2007, 02:36 AM
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#1
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Constant Bitrate
Join Date: Jul 2006
Location: Melbourne, Australia
Posts: 132
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Testing Opus 150 via ATX - Computer is Continually Rebooting
Hi All,
I'm trying to test my Opus 150 Watt PSU via my 500 Watt ATX PSU via the instructions in:
FAQ: How do I power my DC-DC PSU on my workbench? and Powering Your CarPC Outside of the Car.
Whilst the Opus LED doesn't show any issues, the problem is that the computer is continually rebooting:
1) I pull the switch to simulate ignition
2) The computer turns on and goes through POST
3) Windows XP starts to load - welcome screen displays
4) The usual Windows load up sequence commences (wallpaper/icons displayed)
5) Then Windows shuts down and automatically reboots
At this point, all that is powered by the Opus 150 is the motherboard (Via Epia EN12000EG), and my 200GB Sata Hard Disk.
I've searched for "Opus & Reboot" and found the following threads that seem to be similar, but nothing recent, and few potential answers:
2005 - OPUS keeps Rebooting my system
2005 - Just got my opus
2004 - weird rebooting problem..possibly power related..
2004 - Opus in eternal reboot
So I've used my multimeter and taken some photos, and here's what I've found:
ATX Power Specs
Connecting Pins 13 & 14 on ATX power connector
Switch to Simulate Car Ignition
Voltage coming out of Opus molex (PC on)
Voltage coming out of ATX molex (PC on)
Voltage coming out of ATX molex (PC off)
Based on this, and my research in the other threads, it might be that there's not enough power coming from the ATX PSU. I'm not sure why/how this is the case ? Also, if the Opus is smart enough to shut down (to theoretically save the battery), then I don't understand why it boots things up again straight away.
For the record, when I connect up my DVD/CDRW and 2x headrest screens, the 10.5v figures shown above drops to about 10v, but the reboot issue still occurs at the same point during Windows initialization.
So, either I'm doing something wrong, don't understand the concepts well enough, or I desperately need some electrical advice. Perhaps it's all of the above. Either way, I will welcome any of your thoughts/comments.
Cheers,
Long.1
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