Lenovo G710 battery won't charger

[Thermaltake]

Hi I have Lenovo G710 laptop, and my friend diagnose that battery charger chip BQ737 was damaged and won't charge the battery. When he allegedly repair it and return laptop to me I insert my own battery that I purchased from my other friend but he wasn't sure that battery is still OK and have capacity. When I insert that battery into my laptop, it won't charge, it is always on 1% and sometimes charging appear and disappear. And even sometimes it won't recognized battery at all. It even shuts down my laptop after few minutes of use with battery inside, when I remove it laptop was working normally. I asked my friend how did he repair that because it's the same as before, and he told me that I maybe burn that chip with this battery again. I tried three more batteries that my other friend borrow me and told me they are OK, and same thing with all three of them when I try to charge them.

I'm not saying that I don't believe him, but I just want to aks is that really possible, could that chip really be damaged by battery that easily ?

[Techtiger]

Re: Lenovo G710 battery won't charger

Dissembled The laptop come up with the voltage readings of the battery connector pins with battery and with out battery

[Thermaltake]

Re: Lenovo G710 battery won't charger

Dissembled The laptop come up with the voltage readings of the battery connector pins with battery and with out battery

I am more of hobbyist in electronics, I am not much of an expert. That's why I leave that stuff to him. But I was just wondering if it's possible, I tried four batteries and same thing on every four. He told me that he discharge his own batterie to 0 and charge it to 100% and everything went well, and that's only his word, not that I have any other proof.

[Techtiger]

Re: Lenovo G710 battery won't charger

The BQ737 is working fine up to certain point if not the MB will not power on but with out checking some of the input & output pins of BQ737 chip Cannot tell if the charging section working or not may be faulty caps or Mosfet related to charging section

[Thermaltake]

Re: Lenovo G710 battery won't charger

The BQ737 is working fine up to certain point if not the MB will not power on but with out checking some of the input & output pins of BQ737 chip Cannot tell if the charging section working or not may be faulty caps or Mosfet related to charging section

Motherboard is powering On, and laptop is working fine without battery, even with battery it's ok but sometimes it shuts himself off because battery is inside, and showing sometimes that battery is not present or just saying 1% and staying all the time at it. I power on aida64 power managment and charging appears sometimes, and it powers up battery a little then disappear, very strange.

[Thermaltake]

Re: Lenovo G710 battery won't charger

Charger chip BQ737 was the problem. After replacing the chip laptop is charging fine. I been using it now for few weeks without any problem.


Thanks for all suggestions and help