cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
y209aex
Fanfold Paper
Posts: 7
Registered: ‎07-18-2018
Location: GB
Views: 172
Message 1 of 7

Yoga 500 14isk wont stay on, charging is erratic.

My Yoga 500 suddenly wont stay on, it turns of after 1-3 second. After maby 15 attempts it will boot untill shut down. I also noticed the battery is charging in similar 1-3 second intervals with the power light flickering in time with it. It runs on battery but on mains it has the problem. Help?

Sr Support Specialist
Posts: 9,519
Registered: ‎11-30-2015
Location: PH
Views: 156
Message 2 of 7

Re: Yoga 500 14isk wont stay on, charging is erratic.

Hi y209aex,

 

Greetings.

 

I suggest you check the integrity of the charger as shown here in the hardware manual (page 21). Second to check is the charging port. See if it easily loosens when you try to wobble the cord a bit. Any unusual warmth on the cable or charger?

 

Update us how it goes.

 

Regards



Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

y209aex
Fanfold Paper
Posts: 7
Registered: ‎07-18-2018
Location: GB
Views: 143
Message 3 of 7

Re: Yoga 500 14isk wont stay on, charging is erratic.

I have two working chargers, and spare power plug from another working unit. It seemes to be a board level issue? Like a mosfet or cap? Any one have the power rail schematics for this board I have a re ball station but where to start?

Sr Support Specialist
Posts: 9,519
Registered: ‎11-30-2015
Location: PH
Views: 108
Message 4 of 7

Re: Yoga 500 14isk wont stay on, charging is erratic.

Hi y209aex,

 

Greetings.

 

OEM schematics are internal documents so it would be a challenge to get one. Perhaps you should consider checking with your trusted schematics provider if they would have one available so you may start voltmeter testing specially if there is no visible physical issue observed.

 

Regards

 



Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

y209aex
Fanfold Paper
Posts: 7
Registered: ‎07-18-2018
Location: GB
Views: 102
Message 5 of 7

Re: Yoga 500 14isk wont stay on, charging is erratic.

Thanks for the reply, who would be my trusted schematics provider? I cant find any on google search. Im wondering if the start up chip may be to blame, keeping a mosfet gate shut?

Sr Support Specialist
Posts: 9,519
Registered: ‎11-30-2015
Location: PH
Views: 97
Message 6 of 7

Re: Yoga 500 14isk wont stay on, charging is erratic.

Hi y209aex,

 

OEM schematics are internal documents and I was thinking you have your source knowing you have your reballing machine. I am not confident that authorized Lenovo service center would provide such as they simply replace the motherboard if the dc in port is not the fault.

 

If you have fellow board level technicians, perhaps they may assist else Service Centers. Hard to guess with the risk with power related issue specially without certified schematics.

 

Regards



Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

y209aex
Fanfold Paper
Posts: 7
Registered: ‎07-18-2018
Location: GB
Views: 50
Message 7 of 7

Re: Yoga 500 14isk wont stay on, charging is erratic.

After alot of testing and research I am confident that the issue is caused by a falty micro controller - a nasty little Nuvoton NPC series chip, which needs programing befor installing. So without Lenovo's chip programing software this particular fault can't be fixed. Thats the problem with always on power from an non removable internal battery.

Check out current deals!


Shop current deals

Top Kudoed Authors