AsRock Deskmini B760 / B660 STX 12V Input MOD

[sandyware]

Stack solder a 100K resistor on top of the existing component at the indicated position to reduce the under-voltage threshold, making it compatible with a voltage range of 12-19V.
No need to remove the component.
This will lower the fan power supply to 11V, slightly reducing the fan speed at full load. There are no other negative effects, and it can slightly reduce VRM heat generation.

 

[pejer]

Holy moly, you actually did it! I remember trying to do this a little over a year ago and getting nowhere after realizing the ncp81530 had no public documentation. I'm super curious to hear how you managed to pull this off!

did you just probe every smd resistor around the chip? how did you know which one determined the UV threshold???

brilliant work regardless

 

[sandyware]

Holy moly, you actually did it! I remember trying to do this a little over a year ago and getting nowhere after realizing the ncp81530 had no public documentation. I'm super curious to hear how you managed to pull this off!

did you just probe every smd resistor around the chip? how did you know which one determined the UV threshold???

brilliant work regardless

You can find it in the manual of RT9553 protection chip.

 

[Hello1732]

Can you make a video recreating it?

 

[squirrel_slayer]

@sandyware did performance suffer when you did this mod? I went from 74w total package power to 40w. Just curious if you ran into this and if you found a way around it.

Thanks!

 

[sandyware]

@sandyware did performance suffer when you did this mod? I went from 74w total package power to 40w. Just curious if you ran into this and if you found a way around it.

Thanks!

Use bios 1.43(for ryzen 7xxx and 8xxx) or 4.03 (for 9xxx) ，and make sure you turn on "performance mode" in bios "OC tweak" page. Bios after 4.03 remove this option.

 

[squirrel_slayer]

Mine is an intel b760 I'll have to see if it has said tweak and what Bios it's on. I might just be hosed.