Asus f15 Fa506 no screen BQ24780s

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  • greg1985
    Member
    • Oct 2023
    • 13
    • Polska
    #1

    Asus f15 Fa506 no screen BQ24780s

    Hi to All. Problem with laptop is no screen after power up. I have changes bios software many times and there is new bios chip also. Laptop still coming on with no picture.
    Every power line is present.
    I have noticed that in off Mode laptop take 7mA and then 10 to 16mA and coming back. Was interesting what is taking this current. Bq24780 is flickering. I check there is 2.6v, 6v, 18v present. Baterry is charging. What could be problem then? When i remove bios chip laptop takes 7mA only. Could be bios issue still or next step is kbc?
    Tags: None
    • greg1985
      Member
      • Oct 2023
      • 13
      • Polska
      #2
      This is third BQ ic tested and still the same

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13830
          • Canada
          #3
          Bq24780 is flickering.
          Can you clarify this comment? Which exact battery charger IC was onboard the original logic board?

            Comment

            • greg1985
              Member
              • Oct 2023
              • 13
              • Polska
              #4
              When laptop is connect to power, under thermal camera bq ic get hot, pulsuating. power supply shows 7 to 16mA. Also I've noticed strange voltage on BATFET gate - from 6.5 to 8volts and changing. There should be voltage from BQ ic connected by 4kohm resistor. But i dont know why this gate voltage changing.

                Comment

                • greg1985
                  Member
                  • Oct 2023
                  • 13
                  • Polska
                  #5
                  Orginal is Bq24780s.

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13830
                      • Canada
                      #6
                      Part should not be heating up.

                      1) Soldered in properly? Pin #1 to pin #1 on PCB? No solder shorts?
                      2) Some offending interconnect is causing this fault. Flux and remove the batfet to test if the issue is resolved. Perhaps leaking?

                        Comment

                        • greg1985
                          Member
                          • Oct 2023
                          • 13
                          • Polska
                          #7
                          Thank You for response. Yes i will do that. My next idea is also to take another laptop (diffrent company) but with the same BQ ic and check pin voltages also.

                            Comment

                            • mcplslg123
                              Badcaps Legend
                              • Jun 2015
                              • 7262
                              • india
                              #8
                              If battery is charging fine,BQ24780S is unlikely to be faulty.

                              Check powergood signals one by one.

                              Mention the voltages on all coils after powering on.

                              All_SYS_PWR_Good is present?

                                Comment

                                • greg1985
                                  Member
                                  • Oct 2023
                                  • 13
                                  • Polska
                                  #9
                                  Thank You for reply. Update is: oscillating voltages on bq ic could be normal. Found on other forum voltages but not sure for 100%.

                                    Comment

                                    • Sametbey
                                      Badcaps Veteran
                                      • Jan 2021
                                      • 229
                                      • Turkey
                                      #10
                                      It was taken from a working device, it may help.
                                      Attached Files
                                      I'm not happy to be so strong. because it's not humanly

                                        Comment

                                        • greg1985
                                          Member
                                          • Oct 2023
                                          • 13
                                          • Polska
                                          #11
                                          Thank You.

                                            Comment

                                            • greg1985
                                              Member
                                              • Oct 2023
                                              • 13
                                              • Polska
                                              #12
                                              Update. Found missing resistor line 1.8v_gpu_aon.
                                              Closed. Thanks for help.

                                                Comment

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