Problem with 12V 120W ATX PSU
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee, Devonavar
Problem with 12V 120W ATX PSU
I recently purchased a 120W PisoPSU style setup from ebay but even though it starts the fans and the LED turns on, it won't activate the display.
The PC is a Celeron 1.2GHz that I got to run on about 40W at idle, and have all the drives disconnected. It had an AGP card but I tried it with a PCI graphics card and still no juice. When I connect the old ATX PSU it boots fine.
My power meter shows 38W with the original PSU and 36W with the 12V brick + 120W PSU. I checked the 12V and 5V on the drive power connector, and 3.3V on the motherboard plug and it seems ok.
Has anyone had similar trouble with these units? I read something about resetting the CMOS and trying again but I got no love.
I've contacted the seller, but hopefully I can get it working instead of returning it.
The PC is a Celeron 1.2GHz that I got to run on about 40W at idle, and have all the drives disconnected. It had an AGP card but I tried it with a PCI graphics card and still no juice. When I connect the old ATX PSU it boots fine.
My power meter shows 38W with the original PSU and 36W with the 12V brick + 120W PSU. I checked the 12V and 5V on the drive power connector, and 3.3V on the motherboard plug and it seems ok.
Has anyone had similar trouble with these units? I read something about resetting the CMOS and trying again but I got no love.
I've contacted the seller, but hopefully I can get it working instead of returning it.
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- Posts: 101
- Joined: Sat Jan 17, 2009 2:32 pm
- Location: Mexico
See if you can reduce the power draw of the CPU and/or other things. Start with a minimal number of components. Just the motherboard, CPU (underclocked via jumpers or BIOS settings), one stick of RAM, the PCI graphics card and a keyboard.
I think it's a high draw on the +5v rail at startup. The Pico is built for more modern systems which uses the +12v rail to power most things.
You don't need a more powerful brick.
I think it's a high draw on the +5v rail at startup. The Pico is built for more modern systems which uses the +12v rail to power most things.
You don't need a more powerful brick.