Results 1 to 9 of 9

Thread: how many outputs to turn on a pentium 4

  1. #1
    Low Bitrate
    Join Date
    May 2004
    Posts
    82

    Question how many outputs to turn on a pentium 4

    i just build my own power supply using the TI ISR chips.

    I already wired all the 12 v, 5v, 3.3v , ground, and 5v to the power good pin.

    what else do i need? i can't turn on my pentium 4.

    does the -12 and -5 and pw-on pin need to be connect to somthing?

    please help !!

  2. #2
    Maximum Bitrate
    Join Date
    Nov 2004
    Location
    Cali
    Posts
    640
    Quote Originally Posted by xtra
    i just build my own power supply using the TI ISR chips.

    I already wired all the 12 v, 5v, 3.3v , ground, and 5v to the power good pin.

    what else do i need? i can't turn on my pentium 4.

    does the -12 and -5 and pw-on pin need to be connect to somthing?

    please help !!
    P4 does not need -5V, however it does need -12V. And what are the power ratings for your psu?
    I have found you an argument; I am not obliged to find you an understanding.

  3. #3
    Newbie
    Join Date
    Jan 2005
    Posts
    50
    http://hardwarebook.net/connector/power/atxpower.html

    what exactly are you trying to do?

    do you have a mains powersupply that you are trying to reduce the number of wires from, or do you have a DC-DC powersupply that outputs those voltages?

  4. #4
    Maximum Bitrate
    Join Date
    Nov 2004
    Location
    Cali
    Posts
    640
    Quote Originally Posted by never_stock
    http://hardwarebook.net/connector/power/atxpower.html

    what exactly are you trying to do?

    do you have a mains powersupply that you are trying to reduce the number of wires from, or do you have a DC-DC powersupply that outputs those voltages?
    what if its the 24 pin connector? that one doesn't have -5V
    I have found you an argument; I am not obliged to find you an understanding.

  5. #5
    Low Bitrate
    Join Date
    May 2004
    Posts
    82
    Quote Originally Posted by rushnrockt
    P4 does not need -5V, however it does need -12V. And what are the power ratings for your psu?
    12v x 4.5 a
    5v x 13 a
    3.3v x 10a

    is this good enough for a P4 1.4GHz?

    anyone has idea about the PW-OK and PW-ON pin? I wired the pw-ok to a 5v voltage source and pw-on is open.

    are you sure I need -12 to turn on the computer? according to what i read, it's only needed for Serial communication.

  6. #6
    Low Bitrate
    Join Date
    May 2004
    Posts
    82
    Quote Originally Posted by never_stock
    http://hardwarebook.net/connector/power/atxpower.html

    what exactly are you trying to do?

    do you have a mains powersupply that you are trying to reduce the number of wires from, or do you have a DC-DC powersupply that outputs those voltages?
    thanks for the link. I already have them wired up according to the diagram except the -12 and -5 v. and i m not sure about the pw-on and pw-ok pin.

    I have my own dc-dc power supply.

  7. #7
    Maximum Bitrate
    Join Date
    Nov 2004
    Location
    Cali
    Posts
    640
    Quote Originally Posted by xtra
    12v x 4.5 a
    5v x 13 a
    3.3v x 10a

    is this good enough for a P4 1.4GHz?

    anyone has idea about the PW-OK and PW-ON pin? I wired the pw-ok to a 5v voltage source and pw-on is open.

    are you sure I need -12 to turn on the computer? according to what i read, it's only needed for Serial communication.
    i am not so sure about the 12V line... you might be needing more juice, i recommend you look online for the power consumption. Also, is the motherboard the same as in the link XTRA gave you, or does it have more pins? The newer ATX standard does not have -5V and has slightly different pinout.
    I have found you an argument; I am not obliged to find you an understanding.

  8. #8
    Low Bitrate
    Join Date
    May 2004
    Posts
    82
    Quote Originally Posted by rushnrockt
    i am not so sure about the 12V line... you might be needing more juice, i recommend you look online for the power consumption. Also, is the motherboard the same as in the link XTRA gave you, or does it have more pins? The newer ATX standard does not have -5V and has slightly different pinout.
    my mobo has the 20 pin connector. I just found out the -12v and -5v is not needed for the computer to boot up. I cut the -12v and -5v in my AC PSU, the computer still boots up with no problem .

  9. #9
    Newbie
    Join Date
    Jan 2005
    Posts
    50
    Quote Originally Posted by xtra
    my mobo has the 20 pin connector. I just found out the -12v and -5v is not needed for the computer to boot up. I cut the -12v and -5v in my AC PSU, the computer still boots up with no problem .
    serial ports might not work...

Similar Threads

  1. Replies: 9
    Last Post: 02-24-2005, 02:53 PM
  2. Navigator Turn by Turn V2
    By CRCinAU in forum GPS
    Replies: 4
    Last Post: 08-08-2004, 05:49 PM
  3. Replies: 4
    Last Post: 03-25-2004, 05:53 AM
  4. Auto turn on for the DWW TM-710VGT?
    By -al- in forum LCD/Display
    Replies: 4
    Last Post: 12-02-2003, 03:50 PM
  5. Replies: 0
    Last Post: 07-22-2002, 11:45 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •