Quote from: BigJRepairs on February 05, 2014, 11:52:23 PM

Quote from: form on February 05, 2014, 10:06:44 PM

Quote from: DrZeck on February 05, 2014, 09:40:24 PM

Ok, form has answered on that question. one more thing, if you connect fan to the board cut the yellow wire, it will reset PIC16LF1459 all the time. everything else is ok on that side.
@form what we need to change in the code for tach to working ? i have removed it from hardware completely, but it can be used for some alarm when the fan stop working or something like that ... is it big change or minor ? Thanks,

Thats an issue caused by non-standard fans, which actively outputs +12 volts on the tacho-output.
The board is designed for normal CPU-fans (i think it was specified by intel), which have a passive open-collector output on the tacho-pin, which alternatevly connects this pin to GND and leave it open again.

When a non-standard fan outputs +12 volts there, the PIC is entering high voltage programming mode, which is not intended to happen.

So actually no way to avoid it via software, just cut the wire - The software doesnt take care of the RPM anyway.

I just hardwire the fans full speed. Am I reading the chipset datasheet wrong or would stock setting be 1V at 500-1000 MHZ?

0.9V is the default voltage but 1V is just fine i did try 1.2V and they still live, but there is no change with speed for now.