HP 15-bs001ni No image

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • ebyte64
    Senior Member
    • Jun 2023
    • 51
    • South Africa

    #1

    HP 15-bs001ni No image

    Good afternoon.

    I am at my wits end with a HP 15-bs001ni laptop I am working on. It power on but shows no error codes on the caps lock or num lock and no image on screen or backlight on screen.

    Motherboard model is C5L50/C5L52 LA-E811P Rev 2.0

    Measuring voltages on the incoming mosfets are good. 19v on source and drain and 25v on gate for both the high side on low side mosfets.

    Memory voltage of 1.3v is present.
    Cpu/chipset power supplies has 1v
    EC chip has 3.3v and starts up the other power supplies.
    Bios chip has 1.8v
    usb ports have 5v
    Monitor has 19v but strangely I cannot find the 3.3v on the screen connector.

    The board draws 10MA when powered off for the 3.3v LDO and 230MA when powered on. The board also does not display to an external monitor.

    I initially thought it was a bios issue. A forum member was kind and provided me with a bios but still the same issue.

    I cannot feel anything get hot on the board that is out of place. Sadly I do not have a thermal camera.

    Would anyone perhaps have any idea what issue I might be having?
    Attached Files
  • Stevedb
    Stevedb
    • Feb 2018
    • 624
    • Belgium

    #2
    Re: HP 15-bs001ni No image

    Hi does the laptop reacts on caps/numlock? Do you have picture on hdmi? Or with flashlight?

    Comment

    • ebyte64
      Senior Member
      • Jun 2023
      • 51
      • South Africa

      #3
      Re: HP 15-bs001ni No image

      Hi, sorry I left out some details. No, no caps lock or num lock reaction. No picture with the flash light test and no picture over HDMI. The motherboard does show error codes on caps lock when I remove the ram. But testing other sticks also does not produce a change.

      Comment

      • Stevedb
        Stevedb
        • Feb 2018
        • 624
        • Belgium

        #4
        Re: HP 15-bs001ni No image

        Did you try also external keyboard or ctr alt delete to see if the laptop is posting . Then it is time to see hd picture with all coils voltages. How did you flash bios did you also clean me region if it is intel bios.?

        Regards

        Comment

        • ebyte64
          Senior Member
          • Jun 2023
          • 51
          • South Africa

          #5
          Re: HP 15-bs001ni No image

          I tried an external keyboard and nothing. As for the bios I uploaded a backup copy to the bios request forum and was given a clean bios with the correct DMI information added. I flashed it with the CH341 programmer.

          Comment

          • Sephir0th
            Badcaps Legend
            • Oct 2020
            • 1262
            • Germany

            #6
            Re: HP 15-bs001ni No image

            Share resistance to GND measurements of the secondary power supplied please and also take a look whether you can get a VR_RDY from the VRM Controller.
            FairRepair on YouTube

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india

              #7
              Re: HP 15-bs001ni No image

              DRAMRST# present?

              Comment

              • ebyte64
                Senior Member
                • Jun 2023
                • 51
                • South Africa

                #8
                Re: HP 15-bs001ni No image

                I am fairly new to component level board repair in still learning. Where would the vrm controller be? I would assume near the cpu? I have attached an image so long with the resistance values as requested. Thank you all for your time.
                Attached Files

                Comment

                • ebyte64
                  Senior Member
                  • Jun 2023
                  • 51
                  • South Africa

                  #9
                  Re: HP 15-bs001ni No image

                  mcplslg123, regarding your question I do believe it is. I do believe it should be in the aria encircled on the picture attached if I am correct? I get 1.35v there. Forgive me I doon't have a schematic or board view for this board so I am unsure.
                  Attached Files

                  Comment

                  • ebyte64
                    Senior Member
                    • Jun 2023
                    • 51
                    • South Africa

                    #10
                    Re: HP 15-bs001ni No image

                    My apologies I seem to have been an idiot and way overcomplicated it for myself. It was just faulty ram. Thank you everyone for your suggestions and time.

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 14061
                      • Canada

                      #11
                      Re: HP 15-bs001ni No image

                      Your update is appreciated for closure.

                      Comment

                      Related Topics

                      Collapse

                      Working...