Hello,

I have a Lenovo MB LC40CM 19863-1 when press button is pushed the keyboard backlight turns on and off twice and the power button light keeps blinking and the fans spins for a few seconds and stops then again spins and stops (Three times) then laptop turns off. no image on screen. sometime when you leave it for few days it will turn on and work but once you restart it won't turn on.

Tried to reball RAM 1,2,3,4
Checked all voltages on big coils all present except 1V_VCCGT is not present I get 0V on this rail. is this voltage should be present once power button...

Thank you, I wrote it in still same issue, fans spin, keyboard light and cap light on but nothing on display. if I leave it for two days with battery unplugged then try to turn it on it will work find but once I restart then it shows blank screen and no image......

Hello everyone

I need bios for Lenovo Yoga C940-15IRH
LC40 MB 19863-1
MTM: 82DE0011AU
serial number : R9118756

Thank you...