Please check pin 48 for sio chip
me_ac_present
and resolder sp2219 if it is available to be soldered
thank you very much ... only that now it happened to me to make a short with the tip of the tester between pin 11 and 12 of U8100a that it burns a lot, I have to restore the situation, surely I have to replace the qfn then you update, thanks
after replacing the U8100 it also turns on with only the adapter and with only the battery, if after inserting the battery the adapter is connected this goes in protection, if instead I insert the battery after connecting the adapter this does not go into protection but does not charge the battery even if the amber LED is on, if at this stage you press on button it turns on but it is the battery that powers it, the problem can be U8800?
check discharge fet, it might be shorted. Your adapter is going in protection mode when battery is connected means battery voltage is reaching on ac voltage points.
the problem is caused by Q8800 which is shorted between S and D, after its replacement everything works properly, even the battery is charged regularly, I thank everyone for the precious collaboration
Exellent reparation!! I am newbie in electronic repair and I enjoey much when I read a success reparation. But I am a question:
The voltage in shorted transistor Q8800 was measured in the message #7. The owner of the laptop measured 19v in Source and in Drain. The short was not discovered in view of these measures. why? Are these values not enough to reveal the shorted situation??.
But in a shorted MOSFET what is the typical values of voltage for Drain, Source and Gate?? In this laptop the Gate voltage for Q800 would be also 19 volts?? It is an indicative of short that the voltage in the 3 pins have the same values??
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