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omegaone
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Posts: 11
Registered: ‎09-17-2018
Location: CA
Views: 702
Message 1 of 11

Lenovo G700 unable to enter bios

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.

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Registered: ‎08-02-2018
Location: US
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Message 2 of 11

Re: Lenovo G700 unable to enter bios

Hi omegaone! 

 

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. 

 

Regards! 



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SeniorGuru
Posts: 2,299
Registered: ‎11-07-2014
Location: US
Views: 657
Message 3 of 11

Re: Lenovo G700 unable to enter bios

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.

CB


I do not work for Lenovo, I only provide suggestions based on my personal willingness to help others. All advice and comments are based on my experience, and do not reflect Lenovo policy, terms or conditions.
omegaone
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Posts: 11
Registered: ‎09-17-2018
Location: CA
Views: 651
Message 4 of 11

Re: Lenovo G700 unable to enter bios

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.

omegaone
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Posts: 11
Registered: ‎09-17-2018
Location: CA
Views: 650
Message 5 of 11

Re: Lenovo G700 unable to enter bios

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.

omegaone
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Message 6 of 11

Re: Lenovo G700 unable to enter bios

External monitor connected and checked. No display. If there is anything more to do to confirm motherboard malfunction please let me know
SeniorGuru
Posts: 2,299
Registered: ‎11-07-2014
Location: US
Views: 626
Message 7 of 11

Re: Lenovo G700 unable to enter bios

Hmm... The AC charging port was replaced by the prior owner?

At this point I have to agree fully with ChrisE - the notebook needs to be on a service bench to figure out what needs to be done.

CB

I do not work for Lenovo, I only provide suggestions based on my personal willingness to help others. All advice and comments are based on my experience, and do not reflect Lenovo policy, terms or conditions.
omegaone
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Posts: 11
Registered: ‎09-17-2018
Location: CA
Views: 618
Message 8 of 11

Re: Lenovo G700 unable to enter bios

Thank you. Are you able to comment on if this laptop would accept power input without main battery being present?
SeniorGuru
Posts: 2,299
Registered: ‎11-07-2014
Location: US
Views: 614
Message 9 of 11

Re: Lenovo G700 unable to enter bios

It should power up without the main battery installed, and work as normal for testing purposes, however - some models do not boot the OS, just go thru POST then tell you to insert the battery.

CB

I do not work for Lenovo, I only provide suggestions based on my personal willingness to help others. All advice and comments are based on my experience, and do not reflect Lenovo policy, terms or conditions.
omegaone
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Views: 610
Message 10 of 11

Re: Lenovo G700 unable to enter bios

Thank you. In my case, it does not power without the battery or if I remove the battery while powered. it powers down. Also when connecting power, it powers up without power button being pushed. As far as I know, As far as I know, After the replacement of AC power port the system worked without any issue for long time.

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