P4C800-E Deluxe Power Requirements
in [Asus]
|
Prev: MyLogo not working - P5K Premium
Next: Dead A7N8X-X
From: Peter on 13 Apr 2008 10:46 Does the P4C800-E Deluxe motherboard require a -5 volt power supply (in addition to the usual 12v)? If the answer above is Yes, what will happen (or not happen) if I use a power supply that does not provide -5v? Will the board work properly? Will other devices (drives, USB) work properly? I know -5v is not used anymore but this board *seems* to want it. Peter -- **Remove Xs to reply by e-mail**
From: Fred on 13 Apr 2008 11:18 "Peter" <XXpmpmpmXX(a)mindspring.com> wrote in message news:g17404pcolld9plk1674jb9d306m4q63s4(a)4ax.com... > Does the P4C800-E Deluxe motherboard require a -5 volt power supply (in > addition to the usual 12v)? > > If the answer above is Yes, what will happen (or not happen) if I use a > power supply that does not provide -5v? Will the board work properly? > Will other devices (drives, USB) work properly? > > I know -5v is not used anymore but this board *seems* to want it. > Why do you think it needs it? Is there a problem of some sort and you think the lack of -5V is the problem? Maybe it's not booting up. That can be due to incompatible RAM. Anyhow mine runs quite happily from a power supply without -5V and Asus have a question in their FAQ for this board that they get asked all the time. http://support.asus.com/faq/faq.aspx?SLanguage=en-us&model=P4C800-E%20Deluxe Q: My newly purchased ATX power supply does not have -5V voltage. Could this power supply be used on present motherboard? A: ATX power supply voltage of -5V is available to traditional ISA interface device. If your motherboard does not offer traditional ISA interface, or you are not using any of the ISA interface device, then, your system does not need -5V voltage.
From: Peter on 14 Apr 2008 08:59 On Mon, 14 Apr 2008 00:48:54 +0930, "Fred" <bluser(a)gmail.com> wrote: > >"Peter" <XXpmpmpmXX(a)mindspring.com> wrote in message >news:g17404pcolld9plk1674jb9d306m4q63s4(a)4ax.com... >> Does the P4C800-E Deluxe motherboard require a -5 volt power supply (in >> addition to the usual 12v)? >> >> If the answer above is Yes, what will happen (or not happen) if I use a >> power supply that does not provide -5v? Will the board work properly? >> Will other devices (drives, USB) work properly? >> >> I know -5v is not used anymore but this board *seems* to want it. >> > >Why do you think it needs it? Is there a problem of some sort and you think >the lack of -5V is the problem? I think the P4C-800E Deluxe board might need -5v because: 1. The manual that came with the board says it does - although it doesn't say what it needs it for. 2. The board has a -5v connector on it. The original power supply I had in this PC supplied -5v and everything worked fine. That power supplied died recently and I replaced it with a new one that does not have -5v. The board itself still *seems* to work OK (no obvious problems) but two external USB drives connected to this PC no longer work properly. They still work but not 100% properly and that started happening exactly when the -5v disappeared. So I just want to know what the real story is with -5v and this board. I have received totally conflicting feedback from Asus on this question. Two different techs replied with exact opposite answers. Peter -- **Remove Xs to reply by e-mail**
From: Paul on 14 Apr 2008 10:40 Peter wrote: > On Mon, 14 Apr 2008 00:48:54 +0930, "Fred" <bluser(a)gmail.com> wrote: > >> "Peter" <XXpmpmpmXX(a)mindspring.com> wrote in message >> news:g17404pcolld9plk1674jb9d306m4q63s4(a)4ax.com... >>> Does the P4C800-E Deluxe motherboard require a -5 volt power supply (in >>> addition to the usual 12v)? >>> >>> If the answer above is Yes, what will happen (or not happen) if I use a >>> power supply that does not provide -5v? Will the board work properly? >>> Will other devices (drives, USB) work properly? >>> >>> I know -5v is not used anymore but this board *seems* to want it. >>> > >> Why do you think it needs it? Is there a problem of some sort and you think >> the lack of -5V is the problem? > > > I think the P4C-800E Deluxe board might need -5v because: > > 1. The manual that came with the board says it does - although it doesn't > say what it needs it for. > > 2. The board has a -5v connector on it. > > The original power supply I had in this PC supplied -5v and everything > worked fine. That power supplied died recently and I replaced it with a > new one that does not have -5v. The board itself still *seems* to work OK > (no obvious problems) but two external USB drives connected to this PC no > longer work properly. They still work but not 100% properly and that > started happening exactly when the -5v disappeared. > > So I just want to know what the real story is with -5v and this board. I > have received totally conflicting feedback from Asus on this question. Two > different techs replied with exact opposite answers. > > Peter Describe your USB symptoms in more detail. If you've completely lost the usage of USB ports, there is a known problem with ICH5 and ICH5R Southbridge. There is the possibility of latchup failure, which causes the USB ports to die at the output pins. The logic blocks inside the chip are still fully functional, but where the outputs drive the motherboard, that is the point where it dies. (Looking in Device Manager, everything looks normal, but no USB port can talk any more.) What happens, is a lot of current flows, totem-pole style, through the output P and N channel FETs. So much current can flow, that in some cases, a burn mark develops on the surface of the ICH5. For that style of failure, the motherboard will not POST ever again. One of the enthusiast web sites, has a picture of a burned ICH5 caused by that kind of fault. The second kind of failure is similar to the first, except the bond wires inside the Southbridge burn right through, before the rest of the IC package overheats. This causes the USB ports powered by those bond wires, to lose power. And then, the next time you connect your external USB disk drive, there'll be *no response*. In this case, the motherboard continues to POST, but you won't have any USB. So if you're not seeing any recognition at all, of any external USB devices, you'd have to consider a "latchup failure", as an option. The other possibility, is the jumper on the three pin header, that selects between +5V and +5VSB as a power source for a USB interface, has come off. If the jumper is removed from those pins, the USB connector will no longer have power on the +5V pin. (USB interface pins are +5V, D+, D-, GND.) HTH, Paul
From: Peter on 14 Apr 2008 11:54
On Mon, 14 Apr 2008 10:40:48 -0400, Paul <nospam(a)needed.com> wrote: >Peter wrote: >> On Mon, 14 Apr 2008 00:48:54 +0930, "Fred" <bluser(a)gmail.com> wrote: >> >>> "Peter" <XXpmpmpmXX(a)mindspring.com> wrote in message >>> news:g17404pcolld9plk1674jb9d306m4q63s4(a)4ax.com... >>>> Does the P4C800-E Deluxe motherboard require a -5 volt power supply (in >>>> addition to the usual 12v)? >>>> >>>> If the answer above is Yes, what will happen (or not happen) if I use a >>>> power supply that does not provide -5v? Will the board work properly? >>>> Will other devices (drives, USB) work properly? >>>> >>>> I know -5v is not used anymore but this board *seems* to want it. >>>> >> >>> Why do you think it needs it? Is there a problem of some sort and you think >>> the lack of -5V is the problem? >> >> >> I think the P4C-800E Deluxe board might need -5v because: >> >> 1. The manual that came with the board says it does - although it doesn't >> say what it needs it for. >> >> 2. The board has a -5v connector on it. >> >> The original power supply I had in this PC supplied -5v and everything >> worked fine. That power supplied died recently and I replaced it with a >> new one that does not have -5v. The board itself still *seems* to work OK >> (no obvious problems) but two external USB drives connected to this PC no >> longer work properly. They still work but not 100% properly and that >> started happening exactly when the -5v disappeared. >> >> So I just want to know what the real story is with -5v and this board. I >> have received totally conflicting feedback from Asus on this question. Two >> different techs replied with exact opposite answers. >> >> Peter > >Describe your USB symptoms in more detail. > >HTH, > Paul Paul - Thanks for your reply. My USB ports still work and still provide power to my external USB hard drives (at least they do most of the time). The problem is difficult to describe. The drives have become flakey since the removal of the -5v power supply. When I am copying files to one of the external drives the first ten or so files copy normally but then the copying just stops. The drive no longer writes data. Also, I occasionally hear an audible beep coming from the drive which I think means a power problem. Prior to removing the -5v power supply from the PC the external drives worked perfectly all the time. The flakey behavior coincides exactly with the removal of the -5v power. When I move the external drives to a different PC they still work perfectly - so it's not a drive problem. This problem happens regardless of which USB port I use on the PC. Peter -- **Remove Xs to reply by e-mail** |