Announcement

Collapse
No announcement yet.

Asus f15 Fa506 no screen BQ24780s

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #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
    #2
    This is third BQ ic tested and still the same

    Comment

      #3
      Bq24780 is flickering.
      Can you clarify this comment? Which exact battery charger IC was onboard the original logic board?

      Comment

        #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

          #5
          Orginal is Bq24780s.

          Comment

            #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

              #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

                #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

                  #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

                    #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

                      #11
                      Thank You.

                      Comment

                        #12
                        Update. Found missing resistor line 1.8v_gpu_aon.
                        Closed. Thanks for help.

                        Comment

                        Previous template Next
                        Working...
                        X