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1 Posts

10-23-2021

India

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-10-23, 1:51 AM

I try all below instruction, It's still not working

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2 Posts

10-27-2021

Pakistan

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-10-31, 17:23 PM

was also facing the same issues with my Lenovo laptop. But this can be solved by using the laptop carefully.

 

thank you!

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4 Posts

05-25-2021

United States of America

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-10-31, 23:18 PM

Hello all!

 

I have temporarily fixed my touchscreen on this laptop!! I have done it twice now, although I'm not exactly sure why it works...

 

How?

 

I pulled the screen loose and poked at some of the components on the digitizer board with my oscilloscope. While probing I was touching the screen looking for data. I didn't see much on the scope, and it's extremely difficult to do both things at the same time...

 

If I had to guess, I shorted some components with my probe. Maybe this shorting restarted the board or something.

 

 

It stops working if you go into suspend or reboot.

 

So, new theory: There is some initialization process that a firmware component stopped doing correctly.

 

Stay tuned - if I can nail down the exact procedure to fix it maybe, just maybe, Lenovo will listen.

 

Thanks!

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4 Posts

05-25-2021

United States of America

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-11-01, 0:53 AM

I have managed to reproduce it at least 6 times. I think I've isolated the area to poke, see attached images.

Those component have a some sort of clocked signal, running around 400khz

 

While trying to get the shot of the scope I inadvertently got it working again.

 

Hopefully we can get a big brain to take a look -  I'm no electrical engineer...

20211031_204934.jpg 20211031_204134.jpg
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2 Posts

08-31-2021

Pakistan

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-11-02, 14:08 PM

I was once facing the same issue that touch screen was not working and, tried to fix it but there was no chance to find a led with touch so I decided to have and led which can be work perfect but without touch .  

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5 Posts

04-30-2021

Morocco

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-11-03, 13:00 PM

@JonasInTheWhale  

It's the best answer since the beginning.This is a kind of a hard reset, a short circuit which get the microcontroller back to work.This confirm that a firmware rework could trigger the same mechanism and get the embedded controller working again. @LENOVO YOU MUST CONSIDER THIS WORKAROUND.

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12 Posts

02-17-2017

United States of America

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-11-03, 18:39 PM

BTW -

This conversation group is not alone.  There are over 100+  other separate conversations with the identical touchscreen issues

that are also part of this help community.  All with the same problem. Some are brand new out of the box.

If you go to the beginning of "lenovo notebooks" and look at the list of issue links and click the link there are over 18 pages

listing conversations about touchscreen problems. You will also see listed ideapads, chromebooks. etc. In other words, Lenovo should be well

aware of this issue because its across all product lines. 

If you get a satisfaction survey pop-up be sure to mention the touchscreen problem.  Strength in numbers.  

 

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9 Posts

06-20-2021

Belgium

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-11-03, 19:44 PM
Could you list these conversations up? I think it would be useful to consolidate all the Lenovo faulty touch screen threads. Strength in numbers as you mentioned. BTW my unit is not even one year old and the touch screen is also failing.
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12 Posts

02-17-2017

United States of America

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-11-03, 20:11 PM
Its one one of the 'top tags' On my screen it's to the right of this message...hit "View all" and its towards the bottom of page 1. Click on "touchscreen" and find the whole universe. Good luck
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1 Posts

12-01-2021

United Arab Emirates

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Re:LENOVO YOGA 720-15IKB Touch Screen not working

2021-12-01, 12:01 PM

hey! watch this video https://www.youtube.com/watch?v=-TNAHf9r_qs&ab_channel=TheWebmaster/ this will surely help you!

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