Lenovo Thinkpad X13 Battery not charging

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • mferna14
    Badcaps Legend
    • Jun 2018
    • 1015
    • Canada
    #1

    Lenovo Thinkpad X13 Battery not charging

    Hi., I am working on a Lenovo ThinkPad X13 Board # NM-C891. The unit is working fine but the battery does not charge & the laptop does not stay on with a charged battery, if I removed the Adapter cord it just turns off. I put in a new battery & when I turn on, it gives beeps & then laptop does not turn on at all. I checked the battery terminal (JDC1). The reading are as follow:
    Pin 1-2 GND
    Pin 3 NOT Connected
    Pin 4 M_TEMP 2.2v which is very abnormal. This should change to low (GND) when good battery is attached. The volts on this pin never changes with or without the battery or the AC Power in or out.
    Pin 5 DATA 3.3v
    Pin 6 Clock 3.3v
    7-8 Positive (No voltage at all)

    M_TEMP signal is directly coming from UCE1A (MEC1663-WC_WFBGA144) .... Do you think this chip got defective. Is this chip programmable?? Can someone look into this. Thanks in advance
    Last edited by mferna14; 06-04-2023, 11:40 AM.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13955
      • Canada
      #2
      Re: Lenovo Thinkpad X13 Battery not charging

      Pin #4 is driven by the battery pack. Given that both tested batteries are unable to pull this line low, review the actual battery contacts. Next, check the resistance from this battery contact on the connector back to the UCE1A chip.

      That is, the MEC1663-WC is using an input pin (ADC = analog to digital converter) to detect if the battery is connected or not by monitoring the M_TEMP signal.

      After the above checks, use a piece of wire to manually drive the M_TEMP pin low @ junction of PR0101 & PC0102.

        Comment

        • mferna14
          Badcaps Legend
          • Jun 2018
          • 1015
          • Canada
          #3
          Re: Lenovo Thinkpad X13 Battery not charging

          Our saver mon2!!! thanks for the tips I will check tomorrow... Regarding this manual drive "piece of wire to manually drive the M_TEMP pin low @ junction of PR0101 & PC0102." So as I understand One end of the wire goes to the M_TEMP battery terminal & the other end to the junction of PR0101 & PC0102!! Is it right what I have understood???

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13955
              • Canada
              #4
              Re: Lenovo Thinkpad X13 Battery not charging

              No. One end of the wire to the junction of PR0101 & PC0102 and the other side of the wire to ground.

                Comment

                • mferna14
                  Badcaps Legend
                  • Jun 2018
                  • 1015
                  • Canada
                  #5
                  Re: Lenovo Thinkpad X13 Battery not charging

                  Ok thanks, will do this & inform you tomorrow...

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india
                      #6
                      Re: Lenovo Thinkpad X13 Battery not charging

                      Pin7-8 too should show voltage as long as battery is charged(one of the batteries is new as per your post). Resistance check to GND on pin7-8?

                        Comment

                        • mferna14
                          Badcaps Legend
                          • Jun 2018
                          • 1015
                          • Canada
                          #7
                          Re: Lenovo Thinkpad X13 Battery not charging

                          Thanks for all replies, my client has taken the laptop for data backup, once he gets it back, I will troubleshoot once again & let you guys know.

                            Comment

                            Previous template Next

                            Related Topics

                            Collapse
                            • Bowline
                              Dell E6400 PT434 type Battery Charging Stuck at 1%. Battery Pinouts?
                              by Bowline
                              My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?

                              Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?

                              My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
                              The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
                              I have tried multiple different Dell power adapters. My Dell...
                              06-11-2025, 10:13 AM
                            • jared101
                              Lenovo Ideapad 320-15IKA NM-B452 not charging battery
                              by jared101
                              Lenovo Ideapad 320-15IKA
                              NM-B452

                              Hi guys. I've used the forum a lot but never asked questions before. I had a Lenovo come in that was shorted on the 20V rail. I fixed that and thought my job was done until I realized it wasn't charging the battery. Here is what I've checked so far

                              On the BQ24780SRUYR charging ic
                              VCC 20V
                              SMBUS lines
                              SDA 3.3V
                              SCL 3.3V
                              Current Sensing lines
                              ACP/ACN 2.3 ohms
                              SRP/SRN 21.2 ohms
                              REGEN line 6V
                              PHASE .84V with no battery installed(this may be normal)
                              ...
                              08-03-2022, 09:19 PM
                            • Julian Bailey
                              HP ProBook 445 G8 Battery not charging
                              by Julian Bailey
                              Hi all

                              We have in a HP ProBook 445 G8 laptop with AMD Ryzen 7 CPU. When power is connected the power LED light blinks 5 times then stops. Normally HP laptops will blink this LED 10 times as it does a self test when the AC adaptor is inserted. So there must be some sort of short somewhere.

                              The battery doesn't charge, and is erratic on the MM voltage. Bench PSU LED pulsates when the battery is connected also. So the fault must be on the charging circuit?

                              I have gone around the board with a MM and cant find anything

                              Windows shows the battery fine,...
                              10-11-2024, 10:34 AM
                            • mferna14
                              Lenovo Carbon X1 Battery not charging
                              by mferna14
                              Hi, Working on a Lenovo X1 Carbon 1st Gen (Type 3444) Laptop. Came in for battery problems. Upon testing the battery, I noticed that one of the cells is bursted & has to be replaced. Ordered a Brand New battery. Now it works on battery but does not charge at all. I see in Windows 10 it shows the charging sign & AC power connected but stuck on 79%. I did a press-in switch reset at the botton of the laptop, but did not help. Checked the Voltage on the chip BQ24760RSBR, all seem to be fine. Battery voltages are ok 14.4v but on the battery coil L24, when AC is plugged in I only get 1.8V. Then...
                              02-24-2023, 05:25 PM
                            • Document Archive
                              Lenovo ThinkPad ThinkPad E15 Gen 2 (Intel) Notebook E Specification for Upgrade or Repair
                              by Document Archive
                              This specification for the Lenovo ThinkPad ThinkPad E15 Gen 2 (Intel) Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the ThinkPad E15 Gen 2 (Intel) boardview and ThinkPad E15 Gen 2 (Intel) schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties...
                              09-07-2024, 05:00 AM
                            • Loading...
                            • No more items.
                            Working...