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La-7912p No Power

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    #1

    La-7912p No Power

    Hello
    i have 19v vsb on one side of r368 but on the other side i dont have any voltage, i chkd and i dont have any short and i replaced r368 its the same, as i remove q25 the laptop led lights on, the problem i think is susp i have 5volt on pin 2 and 5 of q25, i shorted pin 1 and 6 on q27 laptop turns on and i get 0.10 amper on power supply. (even if this method would have worked how to fix this problem without this shortuct?)
    i have 0 voltage on pin 116 of kbc and 3.3v on 114 when i press power button it goes down to 1v for a short time.
    and i already replaced the kbc and i know its programmable but cant program it i get error while programming it after shorting q27
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    #2
    Re: La-7912p No Power

    Check PCH_RSMRST#, PM_SLP_S5#, PM_SLP_S4#, PM_SLP_3# when triggering power button.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

      #3
      Re: La-7912p No Power

      I dont think this mb will work unless kbc is programmed.Lots of signals may not rise just 'coz of kbc bios. Afailk, this mb kbc doesnt gets programmed automatically on first boot like asus laptops.

      Comment

        #4
        Re: La-7912p No Power

        Right I missed that point. EC needs to be programmed.
        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

          #5
          Re: La-7912p No Power

          Originally posted by piernov View Post
          Check PCH_RSMRST#, PM_SLP_S5#, PM_SLP_S4#, PM_SLP_3# when triggering power button.
          thank you for answering all of them have 0 voltages

          Comment

            #6
            Re: La-7912p No Power

            Originally posted by piernov View Post
            Right I missed that point. EC needs to be programmed.
            but i cant program it it gives me error that it cant identify the kbc

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              #7
              Re: La-7912p No Power

              Which programmer did you use, how did you connect it, what procedure did you follow, why did you replace it in the first place, etc…?
              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

              Comment

                #8
                Re: La-7912p No Power

                Originally posted by piernov View Post
                Which programmer did you use, how did you connect it, what procedure did you follow, why did you replace it in the first place, etc…?


                my co worker saw u42 dosent have any voltages on pin 1 and 8 he replaced the kbc. after that i started working on this board and i used rt809f to program it i did program kb9012 many times before on other boards and even this exact model and didnt had any problem but on this it gives me error. i have 3.3 on l21 next to kbc
                Last edited by JustX; 12-24-2019, 10:28 AM.

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                  #9
                  Re: La-7912p No Power

                  SIO PIN KBD CON PIN TYPE
                  59 KSI4 23 CS
                  60 KSI5 24 CLK
                  61 KSI6 25 DIN
                  62 KSI7 26 DO
                  42 KSO3 04 GND

                  Make sure your rt809 connection is as per this table.

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