DCDC USB Power Switch

**Bugbyte** · 12-27-2010, 07:05 PM

You won't see a voltage change. You have to measure continuity.

I had this same symptom with a defective M4. What happened was the PSU would signal the PC to start but NEVER LET GO of the start signal. It works exactly the same as if you held down the power button on your PC and kept it held down. The PC will start but the power button signals it to shut down after being held for 5 seconds, so it shuts down.

**windex** · 12-27-2010, 07:08 PM

Originally Posted by Bugbyte

You won't see a voltage change. You have to measure continuity.

I had this same symptom with a defective M4. What happened was the PSU would signal the PC to start but NEVER LET GO of the start signal. It works exactly the same as if you held down the power button on your PC and kept it held down. The PC will start but the power button signals it to shut down after being held for 5 seconds, so it shuts down.

Yea I checked continuity too and nothing changes even when i set the pushdown time long.

**Bugbyte** · 12-27-2010, 07:11 PM

You must be measuring it wrong *OR* the cable you are using is shorted. The mobo will only power on if it detects continuity to ground (if it is ACPI compliant). Otherwise, it wouldn't start up at all.

**windex** · 12-27-2010, 07:12 PM

The story behind it starting up is the BIOS was set to start as soon as it gets power.

**nivanov** · 12-27-2010, 09:53 PM

so it would power on when it gets the juice. and then, 5 seconds after, dcdc would send it a power-on signal, which would shut it down? Haha nice one!

**windex** · 12-29-2010, 12:00 PM

Thats not what was happening. To be honest I don't know what was happening. But i do know that when i hit the power switch button in the dcdc usb software i get no change in continuity.

**VegasGuy** · 12-29-2010, 12:37 PM

Originally Posted by windex

Thats not what was happening. To be honest I don't know what was happening. But i do know that when i hit the power switch button in the dcdc usb software i get no change in continuity.

Looks like a bad board. Assuming that the jumpers are set for default (5s delay to power up, hold for 60s after ignition cutoff), if you still see no change in continuity when power is applied or removed, I'd say return it. You should be seeing a pulse at startup and as soon as the ignition cuts off, since the 60s delay is to give the machine time to shutdown gracefully.

Bummer....

VegasGuy

**windex** · 12-30-2010, 05:32 PM

I havent gotten a response from 2 emails i sent to the store. should i just mail it back?

**soundman98** · 12-30-2010, 10:42 PM

it is a holiday week/weekend, so you might need to wait until after new years for a response..

**Jensen2000** · 01-04-2011, 03:12 PM

Hi Windex,

I'm sorry we didn't get back to you earlier on this. It seems your first email fell through the cracks. I apologize for this. It seems like your first ticket was closed by mistake.

Your RMA has been issued and we'll get this replaced for you as quickly as possible.

Thanks.

Stephen