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2 Posts

05-05-2018

NZ

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T480 - High cpu temperature when AC charger is connected

2018-05-05, 2:56 AM

 

 Hi.

 

 I bought the T480 and received on 4th May.

 

 I found out that the CPU temperature is high when the USB-C charger is connected (Idle 45~ degrees celcius) and up to 60 degrees celcius

 

 thus making the fan noise.

 

 -----Additoin

 

 I thought it was the same ACPI issue so i've disabled the thunderbolt 3 I/O port thorugh the UEFI setup however the the idle temperature

 remains up to 45~50 degrees celcius when the USB-C is connected even the performance is set to better battery life power-mode.

 

My T480 does not have dual heatpipe cpu cooler due to integrated graphics.

 

 Is it normal to be 45~50 idle and 60~70 when the cpu is working with USB-C charger plugged in becuase of maximum performance setup in UEFI?

 

 Using HWMonitor, i can see the VID #0-#4 is 1.0~ 1.1V with USB-C Charger on, 0.5~0.6V with the battery.

 

 Any idea what's going on? I'm not sure whether it is normal to have 45~50 for idle and 70 when loaded..

 

 Regards

 

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1 Posts

05-30-2018

RU

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Re: T480 - High cpu temperature when AC charger is connected

2018-05-30, 8:51 AM

Hi,

 

we have the same problem with our lenovo t480 (i5), recently we purchased a test batch 5 laptops and each of them was heated when working from the charger to 90-95 degrees Celsius, while that on the laptop at this moment is not running any heavy applications,

 

in our opinion, this is completely unacceptable, the plastic of the notebook strongly revels from this temperature with prolonged heating,

 

Do we need to get an official response from Lenovo or we need open a warranty case directly?

 

Thanks

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3 Posts

07-18-2019

SE

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Re: T480 - High cpu temperature when AC charger is connected

2019-07-24, 10:03 AM
Hi,

exact same problem here. Is there any solution to that? I have read about the TP Fan control software but this solution will take care of the fan and not of the unusually higher temps and clocks when the laptop is with the AC cable.
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3 Posts

07-18-2019

SE

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Re: T480 - High cpu temperature when AC charger is connected

2019-07-31, 19:49 PM
Sent the laptop for repair and they changed the motherboard and the pcb assemblies. Looks like the problem is not present anymore.
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11267 Posts

01-02-2010

US

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Re: T480 - High cpu temperature when AC charger is connected

2019-07-31, 20:00 PM

It would be normal to run hotter on AC.  The CPU tends to throttle down to concerve power when running on battery.  Faster = hotter


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
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3 Posts

07-18-2019

SE

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Re: T480 - High cpu temperature when AC charger is connected

2019-07-31, 20:07 PM
Sure but at certain points when the laptop was iddle the processor would go full speed, temp increase to 65 degrees for a good 2-3 minutes, then cool down and start over after a while.
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