septicdeath

Among other problems I am having with my system, I was tinkering around with my system tonight and noticed the same thing. Even when the opus is shut off via acc lead, and system power's down. All usb devices (non powered hub and its usb devices) and 2 devices directly conected to USb3/USB4 off the front usb ports are staying turned on. This would lead me to believe the the +5v rail from the opus to the motherboard is active all the time? The only way to cut this power draw is to physically disconnet the +12v from battery to Opus? Keep me posted on this as well. My motherboard is a M10000/VIA

SD

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archimense

If you read the whole thread, it tells you how to fix this...

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septicdeath

Thanks for pointing that out, I caught it early, then skipped forward, just send a mumbo jumbo message to Rando, and in the next 5 minutes and further posts think I might understand it.

Two relays each sitting open until +12v from acc or hdd/fdd +12v rail, each allowing original PSON and +5vsb to pass through the relays in "closed" state to the original locations on the MB ATX connector.

The open/closed control +12volt of the relays is gained from BOTH the Acc+12v feed and the +12v HDD/FDD rail, each feed with a common 4000 series blocking diode anode side connected to the +12v source allowing +12 to the relay but not back from the other +12volt source, grounds on the relays diode blocked (cathode to ground source) anode sides to relay points.

Correct?

Also, no one has mentioned which wires are the +5vsb adn PSON, are they pin #9 (purple) = +5vsb, and pin #14 (green) = PSON?

Thanks
Sorry Rando for the PM, I saw the light after the "submit message" w2as pushed....

archimense

The Via EPIA manual describes which pins on the ATX connector are PSON, etc.

Also, you only need one relay.

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savante

Alright I finally got around to doing this and I was just curious if I got the right relay/diodes.

This is the relay I bought

These Diodes.

I really had no idea what the Amp ratings should be, I figured it was ok if they were low because its just for the pson and +5V anyway... but I'm probably wrong.
Anyway I'm just curious if this will work otherwise Ill have to take this stuff back.

Thanks.

aoLhaTer

thats a pretty spendy relay there

SuperV

even tho this is a hand full of work i am thinking of just getting the install shop to place a switch which will cut off power to the PSU so then no computer part is powered at all that keeps it from draining the battery and me satisfied that I'll be able to start the car in teh morning but I don't think i should have a problem anyway cause of the red top would i ?

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Jackboot

I have yet to do anything about this....I haven't had any hint of a problem at starting my car after having the 5V rail powered through the night. I wonder if I will run into troubles - but I am just gonna wait until then!!!

S1N3d dW17

Instead of a relay, could you just cut the 5VSB line, and wire it to the regular power supply 5V line? This way it will switch with the power supply when powered off. Any problem with this plan?

P.S. Sorry for reviving an ancient thread, but this is the definitive thread for this subject.

rando

You have to disconnect the PSON signal too. Your motherboard uses the 5vsb line to trigger the PSON signal which in turn causes the power supply to turn on. Without the 5vSB, PSON goes low and the PSU turns on immediately. This causes a never ending on/off cycle.

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BlueGrimRX8

I guess its my turn to revive this really old thread.....just a few clarifications after reading over and over everything in this thread.

1. It will be best to use a DPST relay correct?

2. I plan to run power from the 5V side of a Molex connector to a USB hub. Can I just cut the power cord that is supplied with the Hub and connect the 5V from the Molex connector to the positive and negative wires that I cut on the hub.

3. If I do #2 and complete the mod described in this thread, then no power will be provided to the Hub unless the CarPC is on?

4. I also plan to use the 12V side of a molex connector to power my lilliput monitor. This mod and the USB mod described above will not interfere with that correct?

Thanks for all the great help as always.

rando

Yes

Yes

Yes

Yes

You're welcome.

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Twowire

I don't know if this helps, but I solved a similar problem by using a LED and a photo cell. I have a remote computer (server) with USB drives connected. My problem was not having access to turn on/off the computer and USB hard drives. I connected an isolated wireless switch, not the type you buy at Menards, Low's, Etc., to the power on/off button of the computer. I then connected a LED to the 5v line of a molex connector going to my hard drive, and optically couppled it to a light sensistive switch I made using an 741 op amp and a switching transistor connected to a 12 v relay. This is how it works: When I want to listen to music, I push my remote button on my key chain, the computer powers up and turns on the LED. This, in turn, activates my light sensitive circuit turning on my USB devices. When I am done I stop MC. I have Hibernation set for 5 minutes after which time, the computer shuts down. When This happens the LED goes out and the light sensitive switch deactivates, removing power from my USB hard drives. Works for me

zootjeff

You could just use a shutdown controller. That is one of the main features of the uSDC20D. When you don't want the computer drawing power, it doesn't. It goes down to .000050 amps. You can hook it up to your computer and your monitor. It even has an Aux output you can connect to amps and stuff.


-Jeff

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BlueGrimRX8

I have the Opus 150W Power supply so I don't think that that is an option.....

Thanks Rando for the quick reply!!!!

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