On Fri, Jul 17, 2015 at 1:41 AM, Karel Gardas <gard...@gmail.com> wrote: > On Fri, Jul 17, 2015 at 7:07 AM, Abel Abraham Camarillo Ojeda > <acam...@verlet.org> wrote: > >> The PSU of the T1000 uses '4-connector' fan, as far as I know - and I know >> very little after trying to hack into this PSU to make it's fan do less >> noise - >> the fourth connector is used for 'sending rotating speed', so I tried to >> make it do a lot less noise by under voltaging it, like all other fans in the >> T1000 (3 pin fans) but the PSU and the System Controller detects that >> the fan isn't rotating at the speed it told it to do and after three tries >> the PSU shuts down and _bricks_ itself, giving you a nice message in SC >> telling you to 'PSU: fan problem, replace FPU' - or something like that... > > This looks optimistic. So SC is meassuring only PSU's fan speed and > not front fans speeds? Have you tried to completely unconnect front > fans and see what happen?
SC measures the speed of all four front fans (use #showenviron), as far as I know - too busy to check right now - it doesn't display the speed of the PSU fan; if you shutdown a fan you get a warning on SC but nothing else - as far as I recall... > On the other hand it looks like PSU may be more complex. but well, > even standard ATX PSU communicates its fan speed to the board so the > chance is still here. > I can't confirm this. >> I fix the heating problem by opening the case, putting a piece of paper in >> the chassis sensor and dedicating a 40cm diameter standing fan to cool >> my T1000... - having its integrated (except PSU) fans undervoltaged > > So how your modified T1000 sounds then? What exactly have you used to > undervolt front fans? Diodes? To what voltage you got by it still to > have fans rotating? It sounds less like a vacuum cleaner and more as a hair drier in 'low' mode... I used an serial array of rectifier diodes, the model I used might not be the best one for the task but it was what I had available in my city - and I don't know a lot about electronics... 1N4004: http://www.diodes.com/datasheets/ds28002.pdf I can't confirm the voltage they are operating right now - I lost those notes and I'm too lazy to check; but I recall that I use like 10 of those serially for each fan... >>>> One last remark: this machine features neither USB nor optical drive >>> >>> No USB? Hmm, that means no keyboard nor mouse so no workstation but >>> still possible silent server. >>> >> >> You use serial to admin it... > > Yes, that was just a remark about possible workstation usage and by > workstation I mean also with GPU/keyboard/mouse so have SPARC doing > whole firefox/thunderbird/X work. I can still use remote X access > indeed. > > Thanks a lot for your information! > Karel you're welcome! Saludos~
