lenovo thinkpad t420 wont turn on when cmos battery attached

[dqtech]

please help...this lenovo thinkpad t420 early problem is short 19v...after replace short capacitor all working fine...but, when i attach cmos battery on motherboard this laptop wont turn on, power button not respond....it only work without cmos battery....power button and cmos battery is in good condition...i try replace new cmos battery but problem still persist...any idea?

[dqtech]

Re: lenovo thinkpad t420 wont turn on when cmos battery attached

this is schematic and boardview
https://www.badcaps.net/forum/showthread.php?t=97705

[Sephir0th]

Re: lenovo thinkpad t420 wont turn on when cmos battery attached

If it works without CMOS battery present, it means it does auto-power-on as soon as you plug the charger or can youbuse the power switch normally?