Thread: shutdown solution needed

1. Check the power button setting in the BIOS. It should be set to shutdown or soft off. There are other names for it. Just make sure it's not instant-off type words.

2. Use a DMM to watch PSU output power. If it goes to 0V, that's the problem. The ACPI output could be shorting something, but it's not likely.

so after playing in the car today ive discovered 2 things.

1. my bios does not have a power button option or anything that seems related to the power button. it has suspend mode (s1 s3 and auto). tried all three of those and still no solution.

2. where i thought i was a hard off then restart before i dont think its that anymore. i think the pc is resetting instead of hibernating. i thought i was doing a hard off reboot before since the lilliput cuts off then back on. when the monitor turned back on after 1 1.5 seconds the pc was at post.

so this is where I am in my thinking. the pc hibernates fine when done manually. the m2 starts the pc as advertised. when i go from key on position to acc no change. from acc to off pc hard restarts, starts to boot, 30seconds pass the offdelay on the m2 shuts the pc down. it has to be something between the powerbuttion switch on teh m2 and the board. but why would it start like normal no issues but act stupid on shutdown?

i have the at3gci motherboard. if there is a power button setting that i am continually overlooking please point it out lol.

Originally Posted by Curiosity

2. Use a DMM to watch PSU output power. If it goes to 0V, that's the problem. The ACPI output could be shorting something, but it's not likely.

how to you watch the output power? i have the 20pin and the 4pin connected. where do I need to look?

When hibernate causes a reset it's usually bad ram, but you're getting a successful hibernate manually, so that's out.

You could simulate the ACPI pulse by disconnecting the power button wires and shorting them (wires going to the PC) for a half second with a paperclip or anything you have handy. Do it a couple seconds after turning the key on, then let it boot up and turn the key off and short it again. If it resets it's the BIOS (or the reset button?). Otherwise you're going to need to isolate the output somehow.

To watch power set the DMM to 20VDC, touch the black probe to ground (7 black wires) and red to 12V (yellow wire). Usually you can shove the probe into the back of the molex connector to make contact. The 4 or so red wires are all 5V.

ok so i tested all the wires at computer crank, idle, off...there were no voltage fluctuations and all read out the voltages they were supposed to. nothing spiked nor diped at the m2 or at the 20/4pin on the m2 or the 20 pin and 4pin on the motherboard.

i can send the pc into hibernation manually by shorting the pins.

at this point i have at one pointed wired the constant directly to battery and manually triggered ignition from the battery...even then once i took ignition away the lilliput flickered no signal then back on to show the asus screen...computer posted and showed the improper shutdown screen/countdown

any other ideas?

Wow, that's a tough one. So with the M2 wired directly to the battery, when you remove the IGN wire it hard resets? Is that even with the ACPI wires disconnected? I don't think that's an easy fix if so. I'd say there's something seriously wrong with it. Have you tried disconnecting everything else like the amp? Anything else that's not powered by the M2 and connected to the PC?

Being the 20 pin has all the right values and no drops (well a DMM won't show noise or very quick drops) it seems like it would be fine. There's also 3.3V, PWR_OK, and PSU_ON that could be bad, but if the 12V is good the rest should be.

Hi shortydoo,
What mode have you got the M2 operating in ?

yeah even with the pin disconnected it will do that. the really weird thing is the computer fans never react period. my fans have a white led on them (dont ask why they put those on there) and that doesnt even flicker when i kill ignition.

i have a directed hd radio hooked up via mitchjs cable to the pc
a usb port, line in from the hdradio, 2 outs from motherboard to a line driver, and the Lilliput powered off a molex.

should the green light on the board always be lit?

im trying to think of what is involved in shutdown that is not involved in startup since the pc starts up and runs fine.

maybe i need to get another m2...

i haven't used that specific board, but am familiar with a bunch of asus boards-- on most of them, the green light is powered by the 5v trigger line(the line that the motherboard usually connects to ground to tell the power supply to turn on)-- to indicate that the power supply is on. so it shouldn't have too much effect for this problem.

it really is starting to sound like a power supply problem, like it drops voltage real quick and then goes back to normal.

how is your power wire connected? is it running straight off the battery, or connected to a cigarette lighter adapter? what about the ground wire off the power supply?

otherwise, i am also in the southern chicagoland area, and am running a dsatx--if it could help eliminate some problems, or at least narrow it down your trouble shooting before running out and getting another dc-dc, let me know.

i have a 4ga power wire run back to the trunk that splits to 2 8ga. the constant for the pc taps off that. the ignition wire is coming off the ignition fuse back through a relay with turns on the hd radio and signals the pc to come on shut off. the ground has its own ground point not far from the pc.

Originally Posted by soundman98

otherwise, i am also in the southern chicagoland area, and am running a dsatx--if it could help eliminate some problems, or at least narrow it down your trouble shooting before running out and getting another dc-dc, let me know.

thanks i appreciate it.