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12-06-2019

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  • Message 11 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-19, 18:32 PM

Yes that is the same dock

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12-18-2019

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  • Message 12 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-20, 5:50 AM

Thanks.

 

Probably not helpful, since you have the 15" but I just bought this "j5create powerdock" from bestbuy ($129) and it *is* charging my c940 14"

 

Unfortunately it doesn't have an Ethernet... I'm using a usb3 -> gigE adapter which is super janky I know, but it seems to work for now.

 

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12-20-2019

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  • Message 13 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-20, 23:09 PM

Well I am in the same boat with all you guys.  Just got a C940 15" UHD along with a TB3 Gen 2 dock.  After downloading the latest firmware and drivers, no charging.  After being on the phone with technical support for a good hour, they just sent me a new dock.  I am going to pick it up later, but based upon what I am reading here, I am not optimistic.  The term 'fiasco' keeps kicking around in my mind.  

 

I will report back on my experience.  But just to clarify, is the problem that the TB3 Gen 2 dock will not charge the C940, or does the C940 simply not charge using ANY charger on the USB type-C ports?

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  • Message 14 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-21, 16:23 PM

UPDATE!!.... Finally talked to someone in support and they said the TB3 gen3 Type C does NOT charge the Yoga C940. The TB3 is a 135W but the output is only 90w. They did say it is compatable again and this is the one the website recomends. I told him if it does not charge then it is not compatable. So WE will have to look elsewhere for a docking station that the type C output power is 135w. I will start the search but if anyone else finds one first please let me know. 

 

now i get to fight with customer support to return the TB3 because it is after the 30 days now. Probably the last time i buy anything from Lenovo (it"s a shame because i like the C940)

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2 Posts

12-23-2019

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  • Message 15 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-23, 18:37 PM

100w is the maximum power delivery per Thunderbolt specs. The only charger I am aware of that exceeds that is the Dell dock, and it only supplies more than 100w to a Dell laptop. I have a Del, new C940 15", Dell dock, and Lenovo Gen2 dock. There is nothing that will charge the C940 over Thunderbolt.

 

I will be returning my C940 and replacing it with another Dell. It was a mistake for Lenovo to not allow charging over Thunderbolt, even at 100w. This ruins an otherwise perfect laptop.

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12-23-2019

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  • Message 16 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-23, 21:17 PM

Hey everyone...  While looking for a dock I too ordered the TB3 Gen2 dock from Lenovo.  It arrives today...   Will let you know what if I experience same behavior.

 

However, before I bought this dock, I stumbled across this one which a lot of folks were raving about.  I read up on it on WireCutter here:

https://thewirecutter.com/reviews/best-thunderbolt-dock/

 

This dock is going for $249 at your local Apple Store (is not Apple only - is TB3). My next step before returning a laptop will be to try this dock if the Lenovo one doesn't work.

 

Disclosure - I have the 14".

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12-23-2019

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  • Message 17 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-24, 17:17 PM

Quick update. The Lenovo TB3 Gen2 dock works as advertised for me in charging the Yoga C940 14".

However, I can't get the docks firmware update software to update the firmware...

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12-23-2019

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  • Message 18 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-25, 0:19 AM

Further update.  Purely speculating here, but I don't think the Thinkpad TB3 Gen 2 dock can be firmware updated from the Yoga.  I think there may be some sort of Thinkpad-to-Thinkpad_Device thing going on here... possibly enabled by a BIOS setting on Thinkpads.  (The thinking might be that docks are for business users, posers go home?)

 

The Lenovo dock is likely going back.  If I can't make use of full funtionality (including Firmware updates) from the Yoga, that's a no go for me.

 

Picked up the CalDigits TS3 Plus+ this afternoon and it's working very well thus far.  Charges the 14" C940 just fine and the TB3 passes video well (although I'll probably free that up and just connect via DP since I've only one external monitor).

 

Warm to the touch, but not hot...  Whole thing looks like a heatsink anyway.  :)


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12-20-2019

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  • Message 19 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-27, 18:42 PM

Well Lenovo sent me a replacement Thunderbolt 3 Dock Gen 2 (40AN0135US) and unfortunately, but not unexpectedly, it failed to charge my C940 15" UHD Yoga (C940-15IRH 81TE).  So I have asked for a return authorization, and will need to find an alternative solution.

 

Sad.

 

 

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12-23-2019

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  • Message 20 of 39

Re: Yoga C940 no charge w/ Thunderbolt3 Gen2

2019-12-29, 0:51 AM

From what' I've read on these boards, the 15" is a problem for docking.  Not just Lenovo docks, but a LOT of other docks.

 

You may have to locate one that puts out 100W power...  

 

It may be a better solution to use a power supply (buy an extra you can keep at all times on the desk) and then get a portable dock that can extend the remaining thunderbolt port to other types.

 

Not ideal if you wanted to daisy chain monitors and/or storage....

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