Showing results for 
Search instead for 
Did you mean: 
Paper Tape
Posts: 1
Registered: ‎01-08-2017
Location: HU
Views: 658
Message 1 of 2

Lenovo z50-75 bios update failed, black screen

Hi.  I have got a Lenovo z50-75 notebook. I made a bios update yesterday, but it failed and when turn on the screen black. How I solve This problem? Solutions? Thanks for everybody. 

Retired Support Specialist
Posts: 3,772
Registered: ‎12-24-2015
Location: IN
Views: 578
Message 2 of 2

Re: Lenovo z50-75 bios update failed, black screen

Hi there, Gabor           -


Thank you for writing in to the Lenovo Forum - happy to have you here today.


From viewing your model's Hardware Maintenance Manual there is a motherboard CMOS battery.  Unfortunately from the illustrations in the manual it would appear that the CMOS battery on the Z50-70 is soldered directly to the motherboard and cannot be easily removed.  In that case try removing the main battery pack again and then press the power button for 60 seconds or longer.  Hopefully the CMOS battery will not be able to keep up with the power drain and will clear the CMOS.  Then reinstall the main battery pack and try powering it up. 


For your reference, here is a link to the Hardware Maintenance Manual......


If that doesn't resolve the problem then I would recommend contacting Lenovo service centres and applying the normal phone techniques to get it replaced promptly or assist you further.


Schedule a Call-back for faster support

English 24 hours a day 7 days/week 

During business hours, you may also engage with live chat support.


Update us how it goes.








Tap that kudos button if I helped 
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution

Check out current deals!

Shop current deals

Top Kudoed Authors