Asus VivoBook X540YA can't switch on

Model : Asus Vivobook X540YA Rev 3.0
Board id : DAXKAFMB6E0 Rev: E

Laptop can't switch on and found strange condition. When i remove BIOS ic and solder it back, laptop is running well. But turn it off about 30 mintues, it can't switch on again. Remove and replace bios again and it's running again. But i turn it of and after a few minutes it can't switch on again. BIOS ic is ok. BIOS firmware is ok. I already try to flash bios and also tried to replace new ic. But nothing change. Need help.

Is power button working correctly? Also on this platform there is a screw that needs to be screwed if You want the battery charge etc.

There is no fault in power key. I used to switch on laptop form mb test point. Keyboard power button is also ok. The screw is also ok. I already know this screw for battery charge. May be some steps of power sequence is problem and i don't know how to trace this power sequence. Only boardview is avaliable and can't find schematic.

How You confirmed the power button is working? Check the documentation of KBC chip and make sure that when You press the power button, this pin is reacting (3,3V > 0V). You did not mention the type of KBC chip on this platform, so I cannot exactly tell You where to measure.

cygron писал(а):When i remove BIOS ic and solder it back, laptop is running well.

Try just to heat up the BIOS chip with a hot air gun to about 150°C, wait until the chip cools down and then check if that also revives the machine.

I found cracking solder point on some resitors and resolder it. Now problem is solved. Laptop is running well. Thanks for your helping. Best regards.