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5 Posts

09-26-2019

Canada

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720 IDEAPAD SCREEN FLICKERING / OSCILLATING

2019-09-26, 18:04 PM

My Laptop screen is flickering and gets worrst when I change brightness. I have tried unistalling ang updating drives and still no solution. This started after an update. Can anyone help me? I have realized how bad Levono support is. How is it that there is no support/tech agent to contact? When I open the task manager it flickers as well. This has been a recurring issue. The problem went away for a few months and now its back. 

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264 Posts

07-10-2019

United Kingdom of Great Britain and Northern Ireland

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Re: 720 IDEAPAD SCREEN FLICKERING / OSCILLATING

2019-09-26, 18:15 PM

Does the screen flicker when you are in F2 BIOS setup, launched from Novo button menu?

 

https://support.lenovo.com/gb/en/solutions/ht062552

 

(I don't work for Lenovo)

 

 

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5 Posts

09-26-2019

Canada

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Re: 720 IDEAPAD SCREEN FLICKERING / OSCILLATING

2019-09-26, 18:28 PM

Hey Bill, yes it does. When I open BIOS the screen has the same issue. This is the same problem I had months ago but it went away on its own after some update. Now it's back. I have searched the web and tried every troubleshooting method and no luck. 

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264 Posts

07-10-2019

United Kingdom of Great Britain and Northern Ireland

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Re: 720 IDEAPAD SCREEN FLICKERING / OSCILLATING

2019-09-26, 18:32 PM

Does tilting/adjusting the angle of the screen affect the flickering?

 

imho, there is a hardware fault.   

 

 

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5 Posts

09-26-2019

Canada

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Re: 720 IDEAPAD SCREEN FLICKERING / OSCILLATING

2019-09-26, 18:34 PM

Not that does not solve the issue. I thought it was hardware as well, but this started happening after an update

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264 Posts

07-10-2019

United Kingdom of Great Britain and Northern Ireland

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  • Message 6 of 8

Re: 720 IDEAPAD SCREEN FLICKERING / OSCILLATING

2019-09-26, 18:43 PM

Windows Updates can't affect hardware if you are in the F2 BIOS setup screens.

 

Possibly a BIOS update could affect the screen.  But the fact you say the problem went away and then came back suggests to me you appear to have a hardware problem. 

 

See if there is a reset option within the F2 BIOS to restore settings to default to clear any corrupted settings but I doubt it will make any difference.

 

What is the model number ?  

eg. 720-15ikb   (Last firmware update for this model was July 2018 - 5LCN31WW

 

 

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5 Posts

09-26-2019

Canada

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Re: 720 IDEAPAD SCREEN FLICKERING / OSCILLATING

2019-09-26, 18:52 PM

Could it be something to do with a bad driver update? Well the problem went away the first time after an update, and that's why I believe it may not be hardware.

For months I have been able to continue working despite the screen issue using a another monitor. But this has been an issue that has plagued my laptop for a long time.

This is my model:

720S-13IKB (Type 81BV) Laptop (ideapad) - Type 81BV

 

Hey Bill, much appreciated. You resotre my faith in humanity 

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264 Posts

07-10-2019

United Kingdom of Great Britain and Northern Ireland

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  • Message 8 of 8

Re: 720 IDEAPAD SCREEN FLICKERING / OSCILLATING

2019-09-26, 19:36 PM

Driver updates from Lenovo Vantage or Windows Updates, only affect Windows when it is running, not when in the F2 BIOS menu screens (Windows not running). 

 

As mentioned earlier, only type of update that could affect the LCD screen are BIOS updates, either delivered by Lenovo Vantage app, or hidden in a Windows update (Microsoft is known to deliver BIOS updates to other Lenovo laptops)

 

What BIOS version is installed? (You can find version in F2 BIOS menu, or using 'System Information' in Windows)

 

6MCN31WW 13 Feb 2019  BIOS update

https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/700-series/720s-13ikb-type-81bv/downloads/driver-list/component?name=BIOS%2FUEFI

 

If a bad BIOS is responsible for the flickering, you would think there would be many complaints from other 720s-13ikb owners.  Perhaps you have a bad motherboard and the flickering is toggled on or off each time a newer BIOS is installed - I'm speculating of course.  

 

(BIOS updates carry small risk of breaking motherboards. If laptop is out of warranty, it could prove very expensive to replace the motherboard)

 

 

Only other suggestion is to remove the bottom cover and disconnect both the main battery and CMOS battery to clear any corrupt BIOS settings.  I'm not confident it will fix the issue.

 

A laptop repair centre would probably try a replacement screen and screen connecting cable first.  If fault persisted, they would conclude motherboard is faulty if BIOS update doesn't fix issue.

 

Another 720s-15ikb owner reporting screen flickering problems

https://forums.lenovo.com/t5/Lenovo-IdeaPad-1xx-3xx-5xx-7xx/IdeaPad-720s-Touch-15IKB-Glitch-graphics-display-issues-when/m-p/4536860/highlight/false#M74976

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