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myswars
Paper Tape
Posts: 2
Registered: ‎07-25-2019
Location: DE
Views: 193
Message 1 of 3

Ideapad 720S-13IKB USB-C / TB not working properly

Hello together,

 

I have a USB-C Display which works perfectly fine with my Thinkpad T470,

but not with the Ideapad 720S. It will charge the Ideapad and mouse+keyboard (which are connected to the display) are working.

 

But the display itself is not working. This problem is identical with both USB-C plugs.

Following the specifications one of the both is supposed to support native DisplayPort or to be Thunderbolt which supports all Alternate Modes.

 

I found similar questions here but without a solution:

https://forums.lenovo.com/t5/Lenovo-IdeaPad-1xx-3xx-5xx-7xx/ideapad-720S-13IKB-charging-over-both-US...

https://forums.lenovo.com/t5/Lenovo-IdeaPad-1xx-3xx-5xx-7xx/Ideapad-720S-13IKB-81BV-Type-C-DP-Altern...

 

But bying multiple adapters and connecting more than one cable is not accaptable for me. My Thinkpad can do it so it looks like a misbehaviour to me.

Is there anything I can try e.g. BIOS update or drivers?

 

myswars
Paper Tape
Posts: 2
Registered: ‎07-25-2019
Location: DE
Views: 158
Message 2 of 3

Re: Ideapad 720S-13IKB USB-C / TB not working properly

I found a Product Specifications Reference of the 720S and it states out the connector is a Thunderbolt 3 for the 720S-13IKB (Intel model):

https://gzhls.at/blob/ldb/5/d/3/a/1cb461bdc56cbb8321ceaecf465826609af8.pdf

 

That means, either the Thnderbolt implementation is not working properly on my model or the spec sheet is a lie.

Anyone has a working Thunderbolt 3 in his 720S ? Otherwise I should propably contact hardware support.

 

 

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marianFCBT
Punch Card
Posts: 17
Registered: ‎07-01-2019
Location: RO
Views: 145
Message 3 of 3

Re: Ideapad 720S-13IKB USB-C / TB not working properly

Well, I have an Ideapad 720s-13IKB with a 7th gen Intel Core i7 processor. The Thunderbolt 3 port in my device won't support charging the laptop, but anything else works flawlessly. I bought a random 30$ USB-C to HDMI adapter from a department store in my town and it works perfectly. So, I think you should be able to passthrough video to your monitor just fine.

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