Motherboard Fan header Problem

[Digital Doctor]

For some reason the _chassis fan headers on my striker II extreme are stuck at 100% theres options in the bios to enable q-fan and duty cycle mode but they do nothing, the chassis fans stay at 100%, yet the option fan headers can be controlled properly in the bios, strang issue, you think one of the fan controllers could be dead?

[latency]

Have you got 3 or 4 pin fans connected?

Based on the 'duty cycle' setting, it sounds like it's a PWM controller, so it won't be able to control the fan speed unless a 4-pin PWM fan is connected...

[Digital Doctor]

Yea theyre 3pin type latency, on the board theres other three 3 pin headers named OPT_1 ,2 and 3, these all work properly and arent stuck on 100%

Theres 8 headers on the board CHASSIS_ 1,2,3 OPT_ 1,2,3 ,CPU & PWR_FAN only the cpu fan is 4 pin pwm

But only the chassis ones cant be speed controlled (stuck on full) by AI suite or in the bios. Im beginning to suspect a blown transistor i hope not but it looks that way

[latency]

Mmm... maybe... if something had gone pop, I'd more expect the fan not to run at all.

Personally, I prefer to run my case fans fixed-speed (manual fan controller, 7volted, etc), otherwise the varying case temperature keeps the CPU fan jumping around- I hate hearing fans winding up and down constantly...

[Digital Doctor]

Dont know if it's worth me getting the multimeter out and probing the board but if all else fails suppose i could use my lian li controller, bit reluctant to do so though because of all the cable mess.

[latency]

Yea, I've done some hardcore cable extensions to hide the fan leads going to my fan controller.

Have you tried using software to control those fans? Maybe you need q-control turned on, and then an Asus software utility can manage them?

I know AMD chipsets have software access to fan speeds.

[Digital Doctor]

Yea tried asus ai suite and speedfan nothing, permanently set to maximum. opt fan 1 2 and 3 have seperate controllers they work ok using one of them on my fgx card fan (akasa vortexx) but theres a single chassis fan controller on the board to control the speed of 3 other headers which isnt working well it is but i cant turn them down.