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LENOVO G50-70 Charging circuit issue


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#1 MICKY1004

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Posted 14 January 2018 - 08:29 AM

Hi I have the following problem in my G50-70 Laptop

1. While charging the battery ,  sometimes power supply suddenly stops although the charger is plugged in..The behavior is totally erratic ..There is no pattern....it can stop taking power anytime and then the laptop has to draw power from battery...sometimes if i leave the laptop without using it for 3-4 days and will plug it then it will charge smoothly to 100% the battery and will work fine for few hours...but again after sometimes it will stop getting power from charger..sometimes it blinks also like after every few seconds power coming and going as if u are switching off and on the power switch but eventually it will stop getting power from charger..

 

2. I tried calibrating my battery..no use.

 

3. I removed the battery and tried working on direct power supply ..it stopped taking power after 1 hour and switched off

 

What i suspect is that some IC in the power suppply circuit has malfunctioned and when i'm overusing it and it gets heats up then only it stops taking power from outside...may be a capacitor or a fuse or a MOSFET.....

 

KINDLY RESOLVE THIS ISSUE and also share Lenovo G50-70 Schematic circuit diagram for the CHARGING and battery section displaying correct amount of Voltages at every ICs output and input  so that i can check on my own....



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#2 mightywiz

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Posted 15 January 2018 - 02:05 PM

it's 1 of 2 things, either a bad battery or a bad charger.   and your system is probably 3 or more years old?

 

and if it powered off during use without a battery plugged in, i would guess the charger is at fault.  if you purchase a replacement make sure the voltage and current are the same. and you buy an OEM replacement.

generic replacements are not built the same and most likely you will still have issues.



#3 MICKY1004

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Posted 15 January 2018 - 02:34 PM

I have used other charger also ..same problem persisted....both chargers are OEM and for the same model..Battery is also fine ..yes the system is exactly 3.2 years old


Edited by hamluis, 19 January 2018 - 05:51 PM.


#4 mightywiz

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Posted 15 January 2018 - 05:12 PM

then i would think the internal connector on the inside of the computer is the problem:

 

Here is a listing:

https://www.walmart.com/ip/Lenovo-IdeaPad-G50-70-G50-80-G50-85-G50-90-Laptop-Dc-Jack-Cable-DC30100LE00/967921366?wmlspartner=wlpa&selectedSellerId=616&adid=22222222227079236621&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=c&wl3=191904424318&wl4=pla-302345825996&wl5=9029519&wl6=&wl7=&wl8=&wl9=pla&wl10=112354285&wl11=online&wl12=967921366&wl13=&veh=sem

 

now it's either a worn out connector or the charging circuit on the MOBO is bad.  but I would suspect an intermittent connector is your problem.



#5 MICKY1004

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Posted 17 January 2018 - 10:01 PM

ok thanks ..i will try this...


Edited by hamluis, 19 January 2018 - 05:52 PM.





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