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05-23-2019

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T420s remains in sleep mode when I use F4 to put in sleep mode (after fan replacement)

2019-05-23, 21:26 PM

I just had the fan replaced, and now when I use F4 to put the laptop in sleep mode and then close the lid, it remains in sleep mode when I open the lid.  Same thing occurs when I close the lid (no F4) for sleep mode and then open the lid. 

 

However, when I select Sleep on the Windows 7 Start Menu and close the lid, the laptop does resume when I open the lid.

 

NOTES:

- Before replacing the fan, I used F4 for sleep and resume, because when I close the lid I would sometimes find the fan running the next morning

- BIOS is up-to-date

- Keyboard and mouse are set to wake PC

- Power Options Settings:

   - Allow hybrid sleep set to OFF and Hibernate set to NEVER (As they always have been)

   - USB Settings > Disabled USB selective suspend settings  (These were enabled)

 

While this isn't a huge problem, I would like to have things working as before, preferably without having to go back to the Lenovo certified shop.

 

Thank you in advance for your help.

 

Jeff

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456 Posts

08-02-2018

PH

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Re: T420s remains in sleep mode when I use F4 to put in sleep mode (after fan replacement)

2019-05-25, 3:52 AM

Hi JeffAK!

 

Thank you for using the community forums.

 

Have you tried using the combination of Fn+F4 and check if it works? You can change the action of the Fn+F4 key combination by changing the settings in Power Manager. You can also refer in the Hardware Maintenance Manual for more info https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t420s_t420si_hmm_en_0a60241_07.pdf (Page 51).

 

Let us know the result.



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2 Posts

05-23-2019

US

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Re: T420s remains in sleep mode when I use F4 to put in sleep mode (after fan replacement)

2019-05-26, 13:00 PM

Sorry I wasn't clear.  I meant Fn+F4, that's what I was doing prior to fan replacement (it worked), and that's what now doesn't allow me to resume from sleep mode.

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175 Posts

09-06-2018

PH

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Re: T420s remains in sleep mode when I use F4 to put in sleep mode (after fan replacement)

2019-05-30, 16:17 PM

Hello JeffAK!

 

Page 61 of the hardware maintenance manual shows a list of fn key combinations: https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/t420s_t420si_hmm_en_0a60241_07.pdf.

 

Fn + F4 puts it to sleep and to put it back on normal operation you just need to press on the Fn key only without any function key. 



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