Announcement

Collapse
No announcement yet.

Satellite C55-A-142 Laptop boots only without battery

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    Satellite C55-A-142 Laptop boots only without battery

    Hello! I am fixing a Toshiba Satellite C55-A-142 (model no PSCG8E).

    It came with an old battery. Laptop was rebooting every 5 sec with black screen, not even entering BIOS. If battery was removed it worked perfectly only on charger. I thought it's a shorted battery so I ordered a new one.
    Now with the new one it wont even reboot, but the red battery light is blinking on the laptop. Pressing the power button does nothing. Laptop still works with battery removed.

    So to summarize:
    1. there is no short
    2. Laptop starts only with battery disconnected.
    3. With old battery inserted and AC in it kept restarting over again, without entering BIOS
    4. With new battery it doesnt even start, just battery light blinking. Not even with AC in.

    Please advise. Thank you
    I am a beginner.
    Last edited by SMDFlea; 10-26-2023, 07:16 AM. Reason: Satellite C55-A-142
    Tags: None
    #2
    Re: Satellite C55-A-142 Laptop boots only without battery

    Hi.

    1) review the above sticky thread on chargers by @Piernov. It is a must read.

    2) most likely you have a defective mosfet onboard. The charger ics will drive dcin mosfets (usually 2) from the adapter side and another from the battery side. If one or more is defective, you will this issue.

    3) post a link only for the schematic for this logic board. Only if the schematic is in the dedicated forum. If not known, share pics of the white silk screen from your logic board.

    4) remove all power. Meter in resistance mode. Review the resistance between the dcin mosfets and also do the same for the battery mosfet.

    Check for each:

    Source & drain
    Source & gate
    Gate & drain

    A low resistance means the mosfet is defective.

    Comment

      #3
      Re: Satellite C55-A-142 Laptop boots only without battery

      Thank you for helping.

      I have checked all 3 mosfets and all of them have resistance between everything. Resistances are well above kOhms.
      I guess the DC in mosfets should be OK theoretically too because without the battery the laptop works fine. This only happens when I plug in the battery.

      Comment

        #4
        Re: Satellite C55-A-142 Laptop boots only without battery

        Im not sure what you mean by point 3.
        Could you elaborate please?

        Comment

          #5
          Re: Satellite C55-A-142 Laptop boots only without battery

          If the schematic is available then provide the link here but do not post the schematic here. Instead, post it in the schematic only forum.

          Do post the resistance readings because low K values are not good for mosfets.

          Is the battery charged?

          Review the battery mosfet.

          One of these mosfets is leaking and causing this issue. When the power adapter is connected, what is the voltage to ground of each pin of each of the dcin mosfets? The battery mosfet? (Without the battery connected)

          Comment

            #6
            Re: Satellite C55-A-142 Laptop boots only without battery

            Insert the correct battery, the problem will be solved..
            That's how I solved the problem.
            greeting

            Comment

              #7
              Re: Satellite C55-A-142 Laptop boots only without battery

              Thank you for the responses.

              Battery mosfet with DC in (without battery): 3.11 on the source and gate. 19.19 on drain.
              Battery mosfet with battery: 10.8 on source and drain, 16.9 on gate.

              DC in mosfets with DC in(without battery): 19.3 on source and drain, 24.7 on gate.

              Resistance readings:


              Battery mosf:

              gate to source: 0.39 mOhm
              gate to drain: rising to infinite
              source to drain: rising to infinite.
              Last edited by doboka98; 10-28-2023, 02:03 AM.

              Comment

                #8
                Re: Satellite C55-A-142 Laptop boots only without battery

                Battery is charged. Orange battery light is blinking on the laptop. When I remove the battery from the slot, the power on light will light up for like 0.2secs. Just a tiny blink.

                Voltage is present all over the board with battery.
                Last edited by doboka98; 10-28-2023, 02:11 AM.

                Comment

                  #9
                  Re: Satellite C55-A-142 Laptop boots only without battery

                  Update!
                  Replacement battery was faulty. Ordered a new one and everything works fine.
                  Had to uninstall battery controller modules from Windows in device manager.
                  It reinstalled itself and recognized the battery instantly.
                  Thanks for all the help.

                  Comment

                    #10
                    Re: Satellite C55-A-142 Laptop boots only without battery

                    Originally posted by doboka98 View Post
                    Update!
                    Replacement battery was faulty. Ordered a new one and everything works fine.
                    Had to uninstall battery controller modules from Windows in device manager.
                    It reinstalled itself and recognized the battery instantly.
                    Thanks for all the help.
                    Post no. #6

                    Comment

                    Previous template Next
                    Working...
                    X