Thread: M2-ATX problem...again

Originally Posted by jackso11

ok, just to clarify, you want me to turn the igniton and see if the jumper that I connect to the motherboard power switch head has 12v briefly. right?

Nope, sorry if I was confusing.

First, check the switch header on your board. That is two pins. with your multimeter, set it to 12 volts DC range. Take one probe and connect it to ground somehow. Take the other probe, and touch it to the first pin, and then the second pin. See if it shows 12 volts?

ALSO, with the cable disconnect between J8 and the MB, put your multimeter into "continuity" mode, and connect one probe to the red wire, and the other probe to the black wire. Then, simulate the ignition wire (you can turn the key if you want, whatever you can to simulate the ignition) and then see if there is continuity all the time, never, or briefly.

Then, report back.

Michael

Originally Posted by jackso11

check the 2 pins on the motherboard? witht the ignition on and the pc not booting you mean? how will that test the psu if its not connected?

I tested the jumper on the m2 that I connect the red and black wires to that go th the motherboard, but I tested them with 12v range....nothing at all before or after the ignition turned.

K, the first part is to test whether your particular MB is positive trigger instead of negative. Most MB's are negative, and that is what the M2 ios designed for.

The second part is to test to see if the J8 (which is basically a switch to ground) is actually closing (meaning, connecting or being joined) There will not be any voltage on the J8 wires even if it is working 100 percent. I am just trying to figure out if J8 is working correctly.

Michael

Originally Posted by jackso11

right.

J8 continuity is 830 before after and during ignition

mothboard live pin has 3.3v running through it.

Me thinks this might be a positive trigger MB, and you may have effed the M2.

EDIT: I might be wrong. Can you do the following. Can you connect the Meter, in 12 volt mode, one probe to the 3.3, and the other probe to the OTHER pin, and tell me if it still reads 3.3v?

At no point does the 830 disappear, or get much larger or smaller. No matter what, wether the ignition is off, or on, it reads the same. How many seconds did you take the readings. Do it for at least 1 minute when the ignition is off, and the ignition is on.

Michael