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Lenovo laptop won’t charge

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Melly -  
Didi64_549 Posted messages 2889 Registration date   Status Member Last intervention   -

Hello,

I have a problem with my Lenovo laptop. My two computer chargers, which both work perfectly, no longer allow the laptop to charge (the charger isn’t even detected). What’s strange is that I plugged in my phone charger for 2 seconds to test and it charged normally. I should note that the two computer chargers work perfectly elsewhere, so the problem isn’t with the chargers.

I should also mention that this occurred after I removed the battery to replace a damaged fan, so I must have touched something—but what?

Why can I charge with a low-power phone charger but not with a computer charger?

Where does the problem come from? The battery, the connector, or something else?

Model: Lenovo Yoga C740

Thank you.

2 answers

  1.
    Didi64_549 Posted messages 2889 Registration date   Status Member Last intervention  
     

    Hello,

    What is the reason for replacing the fan on a store PC?

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    1. Melly
       

      Hello, it stopped working. The new one works very well.

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      1. Didi64_549 Posted messages 2889 Registration date   Status Member Last intervention   > Melly
         

        Hi again,

        Did you check compatibility with all the hardware in the PC?

        Is it the same fan?

        You can still try to reset the battery, for example with a small tool like the tip of a pen—the battery symbol has a small hole in front where you can insert the pen tip and see.

        What year is the PC?

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      2. Melly > Didi64_549 Posted messages 2889 Registration date   Status Member Last intervention  
         

        Yes the fan is exactly the same one purchased on Lenovo's site by entering the serial number of my model.

        I did a reset with the button at the back and a power reset, nothing changed.

        It's a 2020 model. I was able to use my computer normally after the replacement. The battery still lasts not too badly until I decide at the last minute to charge it and realize that it wasn't charging (no indicator light / no charger detection)

        The smartphone charger is strangely detected by the computer and keeps it alive when I test it, but it is too weak to recharge the battery, of course. I don't know if it's the low power of the charger or the type of cable that makes the laptop respond positively to that charger. I tested two other chargers yesterday at Fnac which did not work.  

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      3. Didi64_549 Posted messages 2889 Registration date   Status Member Last intervention   > Melly
         

        Hi again,

        Sometimes you have to go over all the power wires to see if they’re intact.

        A single wire or other material that turns out to be defective can disrupt the loading.

        Have you tried Safe Mode as well??

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  2. Melly
     

    Update: Since it accepts only the charger of a smartphone, I wanted to try a compromise and bought a 45W adapter (the original charger is a maximum 65W) and voila it works, the PC starts up, I use it normally but the battery stays at 0%. After 4 hours of usage at 0%, the battery suddenly wakes up and charges normally.
    This morning, I put back the old charger at 65W and it works again.
    I don't really know what happened with the fan change, maybe the processor needed to re-adapt or perhaps removing the battery disturbed things. No idea.

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    1. Didi64_549 Posted messages 2889 Registration date   Status Member Last intervention  
       

      Hi,

      If everything works, there is no need to look for why, because sometimes the new hardware must be recognized.

      You installed the same one, so I think with the new, fresh adapter it probably put everything back in place.

      Indicate the subject as resolved, that way you help more people here on the forum who are in the same situation as you.

      Best regards and see you later.

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      1. Melly > Didi64_549 Posted messages 2889 Registration date   Status Member Last intervention  
         

        Thank you, you too. I’m no longer in control. I don’t know if a moderator can do it.

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      2. Didi64_549 Posted messages 2889 Registration date   Status Member Last intervention   > Melly
         

        Re,

        It's done and good luck.

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