X202E

[coicoicoi]

hello!
i'm new here and i don't know where to go. i just want to ask somebody about a laptop problem., i have this asus (X202E) laptop that i fix for a button problem only. the laptop works for a month and suddenly it turns off (no charging LED light & no power LED light). the board has: 19v on power rail, 3.3v on power button, 1.2v from one of the coil

I tried this:

1. replacing the BQ735 chip(responsible for regulating power to the battery). The laptop turns on (for a day) and then turns off (no charging LED light & no power LED light)

2. replace the high side mosfet that supply power on battery. the laptop turns on when i test, but after assembling the laptop, it did not turn on (no charging LED light & no power LED light)

3. replace the low side mosfet that supply power on cpu. the laptop turns on when i test, but after assembling the laptop, it did not turn on (no charging LED light & no power LED light)

i don't have schematics & i don't know what else to do.,
i want to flash bios but i don't have the bios file..

any reply to this is much appreciated...