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Working Asus r752lx, orange light when connect adapter, even without battery

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    Working Asus r752lx, orange light when connect adapter, even without battery

    I have 17.3 inch asus laptop probably whit dead battery, so i decided to replace with new one. But not charging, on old battery show 0% and with new battery its 1%. Looks like that laptop detecting battery always. On battery connector its around 15v, 3v, 3v, gnd.
    motherboard is : tmt YA-4A 19 94V-0 E114139, 1533-61-22

    No schematics, no boardview, but i found BQ735 charging chip on mb.U can see voltages on picture.

    I checked mosfets, not all, they looks fine.

    If anyone can explain what here happening ...
    Attached Files

    #2
    Asus usually have the orange light without battery-so nothing unusual here. Are you sure the new battery is ok?
    Generate a battery report following this method and attach the html file here.
    01.Open command prompt by pressing Win+R and typing CMD.
    02.Type powercfg /batteryreport(note that there is space beofre front slash)
    .03. This will be saved in windows\system32 folder.
    04. Open this file in edge/chrome etc and see for yourself.

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      #3
      Hmm. This new battery replacement is not original, could be problem, i contacted seller he can send another one, but not sure if this will help.
      Can u look in those report please. Iam quite confused.
      Attached Files

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        #4
        Sounds like the battery is likely the issue. Is it an original Asus battery or a knockoff? If it came from a reputable seller, returns should be easy enough. Also, try updating your bios, the report showed you are on an older one.

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          #5
          So u think its battery problem ? I will negotiate to return this one and take battery for another laptop model.
          On uploaded reports one battery is original and it showing 0%, and other one is new replica or knockoff like u said. After bios update ill report.

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            #6
            After "risky" bios update situation is same. Battery icon is always present even without battery.

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              #7
              Capacity remaining is not shown correctly in both battery reports. the battery is detected correctly so that proves smbus communication over SCL/SDA is very likely ok.
              Its perhaps a faulty battery.

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                #8
                Believe you mcpisig123. Battery returned to seller ... maybe ill try working bat one day, ill write here. Thinking maybe chip on bat board is locked, and how to activate, maybe manually add voltage or to ground certain pin....

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                  #9
                  I dont have a answer to your query at post#8 as honestly i dont know.

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                    #10
                    To confirm if the bms board on the battery is locked or not, you will need to use an I2C bus analyzer on a known good battery and then this battery. Then compare the bus analyzer logs. There are commercial tools out there for this market as well. Cheaper to just test with another known good battery pack.

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