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The tale of two T420s and Intel AC 7260\Bluetooth and Pin 51 tape

T400/T410/T420 and T500/T510/T520 Series
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ji2o0k
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Posts: 100
Joined: Sat Oct 31, 2015 6:25 pm
Location: Toronto, ON Canada

The tale of two T420s and Intel AC 7260\Bluetooth and Pin 51 tape

#1 Post by ji2o0k » Tue Jul 04, 2017 8:26 pm

Hoping someone can help explain this to me...

I have two Lenovo T420s (details below). Both are set up very similarily. Both have whitelisted BIOS and I installed the Intel AC7260 + bluetooth Wifi cards. One that had a stock BT worked flawlessly after I installed the AC 7260 card...no issues (I disabled the stock BT adapter and only have the AC7260 BT enabled).

The one without stock BT had issues and I finally stumbled by accident the Pin 51 tape trick. Now everything works flawlessly after taping PIN 51 on the card.

Details below:
Card I am using in both T420s: Intel Dual Band Wireless-AC 7260 2x2 Network plus Bluetooth adapter (7260.HMWWB.R)

PIN 51 tape solution I stumbled upon: https://www.youtube.com/watch?v=F_OWzdeNmD8

1. Lenovo T420s i5 <- this T420s worked right after installing the AC7260 wifi + BT card
Type 4171-53U
Came with stock Bluetooth (I can tell as the BT indicator lights up on the screen bezel)
Disabled the stock BT and everything works well.

2. Lenovo T420s i7 <- this is the T420s that BT didn't work after installing the AC7260 wifi card until I taped PIN 51
Type 4170-CTO
Did not come with Bluetooth (no BT indicator light on screen bezel)

I did install the latest Intel Pro Wireless software package as well as the Intel BT software - but still no dice on T420s #2 - I originally saw the BT in Device Manager but it disappeared after...

Any ideas?

P.S. Forgot to add that both have Bluetooth enabled in BIOS (i.e. Security - IO Port Access)

gobaers
Posts: 3
Joined: Sat Jul 01, 2017 2:48 am
Location: Oakland, CA

Re: The tale of two T420s and Intel AC 7260\Bluetooth and Pin 51 tape

#2 Post by gobaers » Wed Jul 05, 2017 4:33 pm

For the T420s, you shouldn't need to tape the pin, just flash the de-whitelisted bios.

ji2o0k
Freshman Member
Posts: 100
Joined: Sat Oct 31, 2015 6:25 pm
Location: Toronto, ON Canada

Re: The tale of two T420s and Intel AC 7260\Bluetooth and Pin 51 tape

#3 Post by ji2o0k » Fri Jul 07, 2017 4:23 pm

gobaers wrote:
Wed Jul 05, 2017 4:33 pm
For the T420s, you shouldn't need to tape the pin, just flash the de-whitelisted bios.
Weird....both had the same whitelist bios loaded but I couldn't get BT working without taping PIN 51 on the other one.

Whelp, it is working now and will leave it...chalk it up to a mystery...lol

Thx for the help!

rkan
Freshman Member
Posts: 67
Joined: Tue Oct 21, 2008 2:52 pm
Location: Vantaa, Finland

Re: The tale of two T420s and Intel AC 7260\Bluetooth and Pin 51 tape

#4 Post by rkan » Fri Aug 24, 2018 3:24 pm

I'm chiming in with similar issues, altough I've yet to tape pin 51, because I have not had to before. I've had my X220 with AC7260 for two years now, and both wifi and Bluetooth were working without issues until about couple of months ago. Now it seems only wifi is working. I did disassemble the computer once in between, and also might have reversed the antenna connections, which in my opinion shouldn't have anything to do with it. I am going to report back when I get the pin 51 taped! I think I was running a whitelisted 1.42 BIOS. (I'll check that too)

edit: Nevermind, it was the pin 51 tape that had come loose... All good now as usual. Perhaps the pin 51 was just broken on the other T420 / AC7260? :D
T43p - M 770(2.13GHz), 2GB RAM, 60GB HDD, 15in 1600x1200 LCD, 128MB ATI FireGL V3200, CD-RW/DVD-R Multi-Burner, Intel 802.11abg wireless(MPCI), Bluetooth/Modem(CDC), 1Gb Ethernet(LOM)

Sweater Fish Deluxe
Freshman Member
Posts: 86
Joined: Wed Jun 17, 2009 9:22 pm
Location: Ukiah, California

Re: The tale of two T420s and Intel AC 7260\Bluetooth and Pin 51 tape

#5 Post by Sweater Fish Deluxe » Fri Oct 30, 2020 9:25 pm

Can someone clarify for me what's up with the USB lines on the mPCIe ports of the T420s?

The bluetooth daughtercard in my T420s is no longer working and I've already tried putting in a new daughtercard with no luck and also already have an mSATA drive in my WWAN slot, so getting bluetooth working on a combo card in the WLAN slot seems to be my next choice.

The thing is, I thought I understood that the half-size WLAN slot on these machines was PCIe-only and doesn't even carry the USB connections needed for the bluetooth part of a wifi+bluetooth combo adapter. Am I just wrong? I've never tested a combo adapter myself, but I have tested other USB mPCIe devices in that slot and they did not work. These were a microSD card reader and a mPCIe form factor USB wifi card from Realtek, both of which I have tested in other mPCIe slots that do have the USB lines (including my T420s' WWAN slot), so I know they are not broken.

Do all USB devices in this slot need to have pin 51 taped even if they don't have a bluetooth radio? Or is there actually some kind of variation in the USB connection on this slot?

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