HP 15 LA-G078P No video

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  • ruletero
    Senior Member
    • Nov 2018
    • 182
    • Mexico

    #1

    HP 15 LA-G078P No video

    Hi friends

    Please help me with this laptop, it turns on without video...

    Model: HP 15-db0004la
    MB: LA-G078P
    Processor: AMD A4

    I have this laptop that powers up without video, has all of its voltages on its coils, and draws 460 mA.

    No schematic, no boardview, I have been using LA-C701P schematic with kb9022 EC.

    I have these measurements:

    LID_SW# 3.07v (EC pin 115)
    PCH_RSMRST# 1.8 v ??? (EC pin 100)
    PCH_PWROK 3.3v (EC pin 32)
    PLT_RST# 3.3v (EC pin 13)

    Ram Measurements (in red)

    DDR4 ram section voltage check list at ram slot

    DDR4 operating voltage VDD (at coil )= 1.2V 1.2v
    and 142 pin 1.2v

    VTT/Termination voltage= 0.6V PIN 258 0.6v

    VRef_CA. = 0.6V PIN 164 0.6v
    VDD SPD = 3.3V PIN 255 3.3v
    SDA data = 3.3V PIN 254 3.3v
    SCL clock = 3.3V PIN 253 3.3v
    DRAM_RST# = 1.2V PIN 108 0v ????

    Other measurements

    APW8868C (Ram IC) pin 10 (PG) 1.2v ( I guess is correct)
    SY8286BRAC (3alw IC ) pin 9 (PG) 1.3v (LA-F486 schematic)
    SY8288CRAC (5alw IC) ping 9 (PG) 1.2v (LA-F486 schematic)

    I know my problem is RSMRST# (1.8v) but without boardview or schematics is very dificult to find where component is connected, also, having PLT_RST# I thought that all of the above was fine.

    Could you tell me how to continue please?

    I attach all the files
    Attached Files
  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    Re: HP 15 LA-G078P No video

    RSMRST# 1.8V is very likely correct as bios chip may be 1.8V on this mb. Your problem is DRAM_RST 0V. Check consumption on dc supply
    01 With RAM
    02.Without Ram.

    Comment

    • Techtiger
      Badcaps Legend
      • Oct 2014
      • 1601
      • france

      #3
      Re: HP 15 LA-G078P No video

      try a locate RC308 & find out the voltage top both sie of the RC308 feedback

      Comment

      • ruletero
        Senior Member
        • Nov 2018
        • 182
        • Mexico

        #4
        Re: HP 15 LA-G078P No video

        Originally posted by mcplslg123
        RSMRST# 1.8V is very likely correct as bios chip may be 1.8V on this mb. Your problem is DRAM_RST 0V. Check consumption on dc supply
        01 With RAM
        02.Without Ram.
        Thank you mcplslg123

        sorry for the mistake... It consumes 436 mA with Ram and 425 mA without RAM

        Comment

        • mcplslg123
          Badcaps Legend
          • Jun 2015
          • 7262
          • india

          #5
          Re: HP 15 LA-G078P No video

          System is not reading Ram. check ram ic requirement as well as voltage on ram slot. Thoroughly clean the ram slots(assuming its not onboard memory). Last but not the least, try with known good ram stick. Btw, Did you flash bios??

          Comment

          • ruletero
            Senior Member
            • Nov 2018
            • 182
            • Mexico

            #6
            Re: HP 15 LA-G078P No video

            Sorry, I forgot to tell it, yes, I have programmed bios with the oficial from HP ( I downloaded and extracted it).

            Too I have checked all the ram requirements,they are higher friend, all the voltages seem fine except DRAM_RST.

            And I have three DDR4 memory modules, I have checked each with without success.

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india

              #7
              Re: HP 15 LA-G078P No video

              IF you have taken all the steps, it could be bad memory controller in SOC.

              Comment

              • ruletero
                Senior Member
                • Nov 2018
                • 182
                • Mexico

                #8
                Re: HP 15 LA-G078P No video

                Originally posted by techtiger
                try a locate RC308 & find out the voltage top both sie of the RC308 feedback
                Thank you friend but I didn't find any component o resistence connected to Dram_rst, only a test point...

                Comment

                • ruletero
                  Senior Member
                  • Nov 2018
                  • 182
                  • Mexico

                  #9
                  Re: HP 15 LA-G078P No video

                  Originally posted by mcplslg123
                  IF you have taken all the steps, it could be bad memory controller in SOC.
                  Ok, I'm going to give the bad news to the client: /

                  thanks for everything mcplslg123

                  Comment

                  • mcplslg123
                    Badcaps Legend
                    • Jun 2015
                    • 7262
                    • india

                    #10
                    Re: HP 15 LA-G078P No video

                    @ruletero, faced this on many occassions specially more on SOC platform where we dont have the liberty to replace the cpu and/or pch. So have to give up.

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india

                      #11
                      Re: HP 15 LA-G078P No video

                      However, as a last ditch attempt, you can try to replace the pch power ic and its surrounding caps. The cmos cell must be inserted and ram stick also put in place and then power on-it may read ram properly but once you change the ram slot and/or remove cmos cell, it will start behaving same. This trick works on dell 3521 LA-9104P mb where system not reading ram is common fault(replacing the pch is the ultimate solution)-solved many cases utilising this. May help others struggling with this fault.

                      PS: Not sure whether it'll work or not on AMD Platform. Honestly never tried it on AMD Platform.

                      Comment

                      • ruletero
                        Senior Member
                        • Nov 2018
                        • 182
                        • Mexico

                        #12
                        Re: HP 15 LA-G078P No video

                        Originally posted by mcplslg123
                        However, as a last ditch attempt, you can try to replace the pch power ic and its surrounding caps. The cmos cell must be inserted and ram stick also put in place and then power on-it may read ram properly but once you change the ram slot and/or remove cmos cell, it will start behaving same. This trick works on dell 3521 LA-9104P mb where system not reading ram is common fault(replacing the pch is the ultimate solution)-solved many cases utilising this. May help others struggling with this fault.

                        PS: Not sure whether it'll work or not on AMD Platform. Honestly never tried it on AMD Platform.

                        Sorry for my ignorance, in this platform what is the pch power ic? 1.05v?

                        Comment

                        • mcplslg123
                          Badcaps Legend
                          • Jun 2015
                          • 7262
                          • india

                          #13
                          Re: HP 15 LA-G078P No video

                          very likely yes but need schematic to be sure.

                          Comment

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