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HP 15-la c701p turn on but no post

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    HP 15-la c701p turn on but no post

    Hello friends

    Model: HP 15-la c701p turn on but no post at internal and external .
    All voltages are present on its coils, consumption is :
    with ram = 0.342 amp
    without ram = 0.331 amp


    I have these measurements:

    RTC section :
    JCMOS1 = PCH_RTCRST# =3.018v
    JME1 = PCH_SRTCRST# =3.019v

    KB9022QD
    LID_SW# 3.07v (EC pin 115)
    PCH_RSMRST# 3.02 (EC pin 100)
    PCH_PWROK 3.3v (EC pin 32)
    PLT_RST# 3.3v (EC pin 13)

    Ram Measurements :
    +1.35V_VDDQ = 1.362v
    +0.6V_0.675VS = 0.681v
    +V_VDDR_REFA_DQ = .683v
    PCH_SMBDATA = 3.3v
    PCH_SMBDATA = 3.3v
    DDR3_DRAMRST 0v....must be 1.35v

    Trace DDR3_DRAMRST until RC308 ( pull up resistor ) : got 1.35v from only one side ; 0v from the other side...the ohm value is correct .

    Try 2 official bios same issue ; other ram too.

    What to check else ...thank you
    Attached Files
    Last edited by lapfix; 06-09-2022, 05:00 AM.

    #2
    Re: HP 15-la c701p turn on but no post

    +1.35V_VDDQ = 3.3v
    ???

    Comment


      #3
      Re: HP 15-la c701p turn on but no post

      Originally posted by mon2 View Post
      ???
      Hello friend...it was a mistake ...1.365v

      Comment


        #4
        Re: HP 15-la c701p turn on but no post

        UC10 measurements??QD1 Checked??

        Comment


          #5
          Re: HP 15-la c701p turn on but no post

          Thank you mcplslg123

          UC10 :
          pin 2 = 1.363v
          pin 5 = 1.3.63v
          pin 4 = 4.95v
          QD1 :
          Drain and source = 1.363v
          Gate = 4.95v
          Last edited by lapfix; 06-09-2022, 08:32 AM.

          Comment


            #6
            Re: HP 15-la c701p turn on but no post

            Both these measurements are fine. Since you have already flashed bios from hp site, Cpu part of the SOC is very likely to be faulty.

            Comment


              #7
              Re: HP 15-la c701p turn on but no post

              Originally posted by mcplslg123 View Post
              Both these measurements are fine. Since you have already flashed bios from hp site, Cpu part of the SOC is very likely to be faulty.
              Yes , i agree with your conclusion .

              Comment


                #8
                Re: HP 15-la c701p turn on but no post

                Strange , got another same motherboard with same behaviour : no post.

                But in this case DDR3_DRAMRST is present = 1.35v ..the 21 power sequence steps are all presents.

                Try clean me and repairing bios still same , consumption is =

                With ram = 0.740 amp
                Without ram = 0.600 amp
                Notice when on the fan spin high without stoping.

                step of communication between CPU and bios called POST is faulty !! any other idea to be sure!

                Comment

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