LA-E791P Fan voltages

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  • Chieftain
    Senior Member
    • May 2016
    • 72
    • Greece
    #1

    LA-E791P Fan voltages

    Hello to everyone.
    A screw thrown by mistake on board. CPU Fan stopped working.
    HP screen with CPU Fan problem shown from now and on.

    CPU Fan voltages now are :

    5v on red
    3v on yellow
    blue and black circuied on Ground

    Please help...
    Tags: None
    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: LA-E791P Fan voltages

      What did the screw land on ? As the fan has 3v on the Pwm call I’d say your fans shot, try another.

      Edit: What’s the pin out for the fan ?
      Last edited by ReeceyBurger123; 05-10-2021, 12:23 PM.
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • Chieftain
          Senior Member
          • May 2016
          • 72
          • Greece
          #3
          Re: LA-E791P Fan voltages

          Thank you for the fast responce.
          Landed near cpu fan's jack.

          I tried new fan. The same results. No spin

          4pins fan. The blue one takes control depends on the temperature...
          I metered voltages from another working board from an HP-15 with AMD cpu, and I saw that the blue has 1v on startup and next goes to 3v giving spins to cpu fan

          The problem is that there is no schematic for this sh!t and I can't find the pinout circuit of blue cable and where it goes...
          Last edited by Chieftain; 05-10-2021, 12:44 PM.

            Comment

            • Chieftain
              Senior Member
              • May 2016
              • 72
              • Greece
              #4
              Re: LA-E791P Fan voltages

              I found that it takes voltages from ENE which is programmable. pin 26 is for blue cable which is bridged with ground.. It means that I need another ENE chip programmed properly...

                Comment

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