09-17-2018 09:12 PM
G700 when AC cord connected white light on top of screen. (black screen)
Unable to enter bios with quick button. (Also tried other suggested Fn combination, no fix)
Hard drive removed and tested for erros. No erros.
CMOS battery found to be 3V. New battery installed.
No fix sofar. Each time AC cord is connected it makes some noise and keep looping though. (Even without pushing power button)
Any feedback would be appreciated.
Solved! Go to Solution.
09-18-2018 04:50 AM
Welcome to the Lenovo Community!
First of all, we're sorry for the trouble. Based on what you explained, the laptop is no longer posting up (No POST - Power On Self Test). This particular issue may result to a motherboard replacement. If the BIOS is no longer accessible, meaning, the motherboard is failing or malfunctioning and the next option is to have it replaced. Please try connecting an external monitor right after you power on the laptop and check if you will see a display from the external monitor. If the issue persists, we can conclude that the motherboard is defective.
In addition, you may check this article https://support.lenovo.com/us/en/solutions/ht500216?CID=ww:lenovosocial:20x9m6 on how to access the BIOS of the laptop.
09-18-2018 09:21 AM - edited 09-18-2018 09:23 AM
Did you ever try the AC adapter only without main battery installed? If it is producing the same situation without the battery, and you have a Volt - Ohm Meter (VOM) you can also check the AC adapter to make sure it is working properly. It sounds like the AC adapter or the charging port may be having issues.
09-18-2018 12:36 PM - edited 09-19-2018 03:38 PM
Thank you. I have checked the AC adapter already for Voltage (19.0 V DC) before connecting to laptop.
I do know the input connection wire adapter from external input to motherboard was previously replaced by previous owner.
My question is, if I remove the main battery and connect the adapter to laptop will it accept power?
Any feed back is appreciated.
09-18-2018 12:41 PM
Thank you. I will follow through on your suggestions. Are you able to comment on the effects of a dead CMOS battery to the system?
Prior to failure, the laptop required occasional removal of main battery inorder to power up.
09-19-2018 09:21 AM
09-19-2018 05:17 PM
09-19-2018 06:24 PM