A8V-E Deluxe CHA_FAN 2

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walhol

Hello,
the system was running well, but at least I wanted connect the Signal Fan
cable from the Antec Neo Power to the CHA_FAN 2 to observe the FAN. Suddenly
the Power shuts dwon ( short cut). Since this was happend, only the green
LED of the Motherboard lights, but no if I turn on the Power nothing begin's
to start no CPU-FAN .

Is now the Motherboard destroyed or the Power Supply or everything?.

Thanks
Walter
 
Hello,
the system was running well, but at least I wanted connect the Signal Fan
cable from the Antec Neo Power to the CHA_FAN 2 to observe the FAN. Suddenly
the Power shuts dwon ( short cut). Since this was happend, only the green
LED of the Motherboard lights, but no if I turn on the Power nothing begin's
to start no CPU-FAN .

Is now the Motherboard destroyed or the Power Supply or everything?.

Thanks
Walter
Click to expand...

Never plug or unplug things with the power on!

You probably connected the ground on the PSU fan sensor cable,
to the +12V on the CHA_FAN 2 header. That will short the +12V
on the motherboard, and burn the copper track in the motherboard.

To test the power supply, pull the power supply from the computer
case, then connect PS_ON# to a COM pin. The pinout for the power
supply is here on page 36:

http://www.formfactors.org/developer\specs\ATX12V_PSDG_2_2_public_br2.pdf

When PS_ON# is connected to COM, the power supply fan should start
to spin. You could then use a voltmeter to measure the voltages,
but really, if it starts to spin, it is likely unharmed.

It is probably time to RMA the motherboard or buy a new one.

If you have an ohmmeter, you could do a continuity check from the
+12V pin on CHA_FAN 2 header, to the 12V pins on the 24 pin ATX power
plug. That circuit is likely now open circuit. If that particular fan
header is controlled by Q-fan, the header is NOT connected directly
to +12V (there would be a transistor in the path). If a fan header
is not controlled by Q-fan, then it could go directly to +12V. That
is all I know. Due to the fire hazard, I don't recommend trying to
fix this yourself. Get some help, preferably by using the warranty.
That is better than burning down your house. Asus should really
put a Polyfuse in that circuit.

Paul
 
Hello Paul,

thanks a lot for your helpful hints. I did what you recommended. Thank
goodness, the Motherboard was ok. I measured form the CHA_FAN Pin to the
EATX 24 Pin connector and as I heared "beep" I was breathe a sigh of relief.
Then I connected the new Power supply "in power off state!!!!" and the
system comes up. I was so down, and now I am happy. I tougth everyting is
dameged. I will never plug things with the power on. Normally I'm very
correct and careful but I don't know why I did this.

Thanks

Walter

 
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