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Lenovo T420 - Bluetooth not showing up

2012-08-03, 23:50 PM

I have a Lenovo T420 (4236-A79).  I'm trying to get the bluetooth working, but am failing miserably.  Information about the system:


Windows 7 Enterprise SP1

All latest drivers installed from ThinkVantage System Update

Bluetooth is ENABLED in BIOS (and BIOS at the latest rev)

HOTKEYS installed (and deleted, and reinstalled)

Fn+F5 (or running TpFnF5.exe) only shows the Wireless Radio.  It does not show the Bluetooth Radio.

Tried TpFnF5.EXE /BTON and that did not turn on the Bluetooth Radio.

Downloaded Bluetooth with Enhanced Data Rate Software II for Windows 7 (7zwb06ww.exe), but when I run it and try to install I get the message 'No Bluetooth device was detected.  Please make sure that your Bluetooth device is plugged in properly in order to continue installation.'

When I power on the laptop the green Bluetooth light does go on for a moment and then goes off.

When I do a hardware discovery in Device Manager nothing is found.

The Bluetooth Support Service is running and set to Automatic.


I am at a loss as to what else to look for.  Any ideas would be helpful



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Re: Lenovo T420 - Bluetooth not showing up

2012-08-05, 12:37 PM

When device driver don't see the bluettoth device, then it is not there.


If there is no device, all other activities are useless.


Are you sure the laptop comes with one?

If yes, are you sure it is working?

If you are certain there is a bluetooth device and working, try http://www.uniblue.com/cm/hwinfo/driverscanner/inprogram/download/?aff=21128&x-at=inprogram to scan for drivers and install it




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Re: Lenovo T420 - Bluetooth not showing up

2013-04-02, 20:37 PM
Go to Control Panel >> Network and Internet >> Under Lenovo - Internet Connection click "Turn radios on/off" >> Power on Bluetooth. This worked for me :)

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Re: Lenovo T420 - Bluetooth not showing up

2013-04-03, 17:27 PM

Bluetooth has been a challenging on the T420 for sometime now. The only thing that seems to work is to make sure that you have the most recent BIOS and perform a cold boot. It then seems to work for a while. It doesn't like to show up in Device Manager, in the FN+F5, or anywhere else.


The one time I called support about it, the BIOS update fixed it while I was on the phone. Of course, the next day Bluetooth wasn't working again. I haven't bothered to call back to try again. I imagine the permanent solution is to have the machine repaired under warranty. I'm not sure what they will do to it to repair it. I have a suspicion it is a driver or hardware problem -- I think its not coming back on after the machine is sleeps or is hibernated. 

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Re: Lenovo T420 - Bluetooth not showing up

2018-11-07, 17:49 PM
I've been dealing with bluetooth for two days. I opened an account to thank.

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Re: Lenovo T420 - Bluetooth not showing up

2018-11-07, 17:47 PM

x220 • Gobi 2000 3g | hdd, msata ssd, wwan, wifi, gps -- unique config
ThinkPad 25 Special Anniversary Edition. #Retro. Signed by D.Hill
T470p | X1 Carbon Gen3 | Miix 2 10" | Yoga Tablet 2-1050F (Android) + BT Keyboard
ThinkPad Stack • 2.4/5 Wireless Router, HDD 1 TB, BT Speaker, Power Bank, Mobile Projector

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