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Originally Posted by IronStone ive tried the hint you gave me and powered the MAX6657 with the 5VSBfrom the attp1 got GND from the attp1 also and lifted pin7. SMBCLK and SMBDATA to the SMBus, but on power on i got the siren. |
Do you have #STBY pulled up to 5VSB also? #STBY low disables the internal bias generator. This might be the cause of your problem. If this is not the case, then I am as mystified as you.
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Originally Posted by IronStone So i done your mod. Pressing power on ... nothing happens ... urgh ... no siren nothing no fan is running only the red led is burning. removed the mod checked again, mobo runs fine. Today ive bought another nf7-s (new) and tried your mod there. Same procedure... on Power on nothing happens. No siren, nothing but the red led. |
This also is exceedingly curious. About all I can offer here is some basic trouble-shooting:
Pin 68 of the Winbond chip is PSIN. It is internally pulled low. You should see it go active high when you press the power switch.
Pin 69 is PSOUT#, and is the inverted conditioned output of PSIN. It is normally high, and pulses active low when PSIN goes active.
Pin 3 of the ATTP-1 chip is PSON_IN#. When the power switch is activated, you should see this pin go low and stay low.
Pin 6 of the ATTP-1 chip is PSON_OUT#. When pin 3 goes low, pin 6 should go low also, unless the ATTP-1 thinks there is an over temperature condition, in which case pin 6 will remain high and pin 1 (SIREN#) will go low.
I'm pretty sure there is some logic between pin 69 of the Winbond chip and pin 3 of the ATTP-1, but I don't know where or what.
Hope this helps you.