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10-02-2019

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Charging Issue: starts and stops every few seconds (T550)

2019-10-02, 19:56 PM

[first time posting; thanks for your patience]

 

Model: T550.  

 

Problem: when plugged in, the battery begins charging, then stops, and then begins again, in a loop, every few seconds.

 

IMPORTANT: when the PC is off, the battery charges fine (i.e. continuously, without the on-off loop).  

 

So, it is not the power adapter or the jack, since the PC charges continuously when the PC is off (as determined by listening to the faint buzzing in the transformer, and the lack of the flashing light that indicates the beginning of charging).  

 

The problem may have presented after a BIOS or Windows update (i'm not certain, though).  

 

I've tried using Divice Manager to delete the battery drivers and let Windows reinstall--no luck.   

 

My problem is similar to that listed in another post, but that post was about T440s, did not have a good solution, and did not mention the detail about the problem being present only when the divice was powered on.  cf.  https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/Charging-stops-and-starts-every-few-seconds-in-a-loop-T440s/m-p/4249134/highlight/true#M129067

 

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2 Posts

11-22-2019

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Re: Charging Issue: starts and stops every few seconds (T550)

2019-11-22, 20:48 PM
Hi, I have the same problem as you. I also think it may be due to some update of Windows or BIOS. I also have a T550 Any solution?
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3 Posts

12-16-2019

ID

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Re: Charging Issue: starts and stops every few seconds (T550)

2019-12-16, 15:06 PM

Hi.. I just got the same issue with my T490.. Any solution? Please help..

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Re: Charging Issue: starts and stops every few seconds (T550)

2019-12-16, 15:32 PM

I have completely resolved the problem--at least for my device.  

 

Solution: buy new, higher powered (65W) AC adapter.

 

Details:

 

I believe the problem was that the AC adapter I had (45W; aftermarket) was not supplying enough power to the device to both charge the battery and power the machine.  So, if I had the PC off, it would charge fine (without the on-off interruption) ; but if I had the PC on, and especially if I had the screene open, it would togel back and forth between charging and powering the device.  (Also, Ithink I got the charging-on-off-every-few-seconds issue only when the battery was less than 50% or so--which would make sense, since I believe that the PC draws more electricity and charges the battery more agressively the lower the battery is--some "fast charging" technology).  

 

The solution was to buy a new, higher powered charger: a 65W. 

 

Since using the new charger, I've not had any problems. 

 

 

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Re: Charging Issue: starts and stops every few seconds (T550)

2019-12-16, 15:32 PM
see solution just posted to original post
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3 Posts

12-16-2019

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Re: Charging Issue: starts and stops every few seconds (T550)

2019-12-17, 15:21 PM

The original charger of T490 is 65 Watt. And yes, it happened when the battery less than 50%.. No problem when charged while off and above 50%..

 

It's very unconvinent though to work, just like I have only half of the battery functioning..

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Re: Charging Issue: starts and stops every few seconds (T550)

2019-12-17, 15:40 PM

If your charger was beginning to fail, and thus not provide the intenteded (and requisite) amount of energy, this would explain what's going on. Given that a new charger solved the problem for me, I'd consider trying a new charger--but that's just what worked in my case. 

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