RuamRudy Posted October 19, 2019 Share Posted October 19, 2019 I have a Lenovo laptop that has what appears to be a relatively common problem in that certain keys randomly do not function. It can function normally for days then for no apparent reason certain keys won't work or need to be pressed multiple times to work. According to the forums I have read, Lenovo has done nothing to fix it, but some users discovered that by disconnecting the main and CMOS batteries then reconnecting them, the issue disappears. I don't know much about CMOS batteries - will I cause any problems if I do this (as in ask a technician to do it)? I guess a system backup before I do this would be wise? Thanks Link to comment Share on other sites More sharing options...
Vacuum Posted October 19, 2019 Share Posted October 19, 2019 I've had similar problems on an Acer. Sprayed the keyboard with CRC Contact Cleaner. Link to comment Share on other sites More sharing options...
RuamRudy Posted October 19, 2019 Author Share Posted October 19, 2019 I've had similar problems on an Acer. Sprayed the keyboard with CRC Contact Cleaner. [emoji106]If I start it in safe mode, the issue never occurs. It only happens in the normal Windows environment, so I suspect it is not a hardware issue. Sent from my SM-G975F using Thailand Forum - Thaivisa mobile app Link to comment Share on other sites More sharing options...
Tayaout Posted October 19, 2019 Share Posted October 19, 2019 Disconnecting the CMOS battery won't make any problem. There is even a reset jumper or switch on the motherboard for this reason. You will lose BIOS and time configuration. Most of the time users don't change these anyway. No risk for your data at all. You can search for your specific laptop on YouTube and you can see if you feel confident doing it yourself. For example: Link to comment Share on other sites More sharing options...
worgeordie Posted October 19, 2019 Share Posted October 19, 2019 As far as I know the CMOS battery is there to keep the time and date, take it out and pt back,and PC will reset the time and date again when you reboot. regards Worgeordie Link to comment Share on other sites More sharing options...
thedemon Posted October 19, 2019 Share Posted October 19, 2019 Agree with the above posts. Generally no issues. However before removing the CMOS battery go into the BIOS and check the Boot settings. There will be options for BIOS/UEFI and there may be Secure Boot On/Off. Perhaps take a photo of that page. If your OS was installed with one setting and the CMOS defaults to the other then the system won't boot until it is reverted to the original setting. Link to comment Share on other sites More sharing options...
Speedo1968 Posted October 19, 2019 Share Posted October 19, 2019 7 hours ago, Vacuum said: I've had similar problems on an Acer. Sprayed the keyboard with CRC Contact Cleaner. Yes me too with Acer, every day the key for the letter 'j' or numbers 6 and 8. Link to comment Share on other sites More sharing options...
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