generic laptop no power on except with adapter pluged in

[desktop85]

Hello to everyone, this is a generic chinese laptop, the motherboard part number is c42IIX Main BD REV.01 / 37GC42200-10

With the charger pluged in the laptop power up and work with total normality, if I unplug the charger with the laptop on it still working with the battery charge for a long time. With the battery totally charged I tried to power it up but the dc adapter unpluged then the laptop won't turn on. I change the battery controller IC OZ8618 but the failure persist. Can someone help me with your wonderful ideas?

[ktmmotocross]

Re: generic laptop no power on except with adapter pluged in

bad battery. seen some with same symptoms

[meritosari]

Re: generic laptop no power on except with adapter pluged in

bad battery. seen some with same symptoms

Hope schematic can helps

[desktop85]

Re: generic laptop no power on except with adapter pluged in

Thanks for the schematics, I don't understand if the battery is damage or working wrong, why when the laptop turn on and I unplug the adapter the laptop still working?. The failure is similar to the Toshiba laptop A305 series with NEC TOKIN

[desktop85]

Re: generic laptop no power on except with adapter pluged in

I think that I wasn't clear on my first comment. This is the problem, I need to plug the adapter to turn on the laptop, then if I want I can unplug the adapter and the laptop still working with the battery charge without problem. But if I turn it off the laptop won't turn on with only the battery, I need to plug the adapter again turn it on and then I can unplug the adapter again and still working with the remaining charge

[desktop85]

Re: generic laptop no power on except with adapter pluged in

I use the adapter like some kind of starter XD

[mcplslg123]

Re: generic laptop no power on except with adapter pluged in

Voltage at pin 15 of pu4?? Check schematic page 29. Some kind of fault likely to be here.