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Hello everyone
Problem: The Case
Fan hardware CHA_FAN2 does not properly enumerate when mains power is
first applied, but works on subsequent boots as long as mains power
stays connected. Config: H170M Pro4
with v2.0 BIOS, Silverstone ST50F-ESG 500W power supply, Windows 10
Home 64-bit, Intel Core i5-6600 CPU stock fan, Noctua 80mm NF-R8
Redux Edition PWM Case Fans Consider this
procedure:
- Power is
disconnected from the power supply
- Power cord is
plugged in, and the PC turned on
- The
motherboard does a configuration scan (POST maybe?); all fans spin
momentarily (CHA_FAN1, CHA_FAN2, CPU_FAN1). This appears to take a
while.
- Motherboard
(eventually) starts, ASrock splash screen shows, and the OS begins
to boot, where now only one case fan and CPU fan are spinning
(CHA_FAN1, CPU_FAN1)
- CHA_FAN2
never spins, and using a tool like HWiNFO to interrogate the
hardware, it shows this
fan's hardware is
missing completely (not
just 0 RPM)
- Shutdown the
OS; but leave power cord connected to the supply
- Turn on the
PC again; the motherboard starts much faster than earlier and this
time the fan will spin up & appear in the HWiNFO tool with
current speed
- Fan will
operate normally after every shutdown or reboot as long as power
is not removed from the power supply. The fan goes missing
again on first boot if power is disconnected.
I contacted tech
support on this problem, but they said they were unable to reproduce
it. So I'm putting out the question to others to see if they have
the same issue. Here is what tech support said to try: - Load BIOS
default settings
- Test the
chassis Fan which installed at CHA_FAN2 to other fan header, or
another fan to this header
- In H/W
Monitor tab, please set the CHA_FAN2 to "Full Speed"
I haven't tried
any of these as the PC now belongs to a family member some distance
away, but since the fan does actually work the diagnostic steps seem
redundant to me anyway. I hope someone can
reproduce this, so I can take it back to Asrock for analysis. Thank for reading!
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