Lenovo Flex 2 14" LF14M MB Please help me to identify component

[loser18]

Re: Lenovo Flex 2 14" LF14M MB Please help me to identify component

Also I'm notice on pin 76 KBC that is connecting to 3D3V_AUX_S5...

Actually it's PIN75 (at least on my shcematic) and I have 3.3V there.

Just noticed that AC_PRESENT signal on PIN112 fluctuates.

My gut tells me the KBC will be faulty.

[on/off]

Re: Lenovo Flex 2 14" LF14M MB Please help me to identify component

Actually it's PIN75 (at least on my shcematic) and I have 3.3V there.

Just noticed that AC_PRESENT signal on PIN112 fluctuates.

My gut tells me the KBC will be faulty.

Ok my big mistake. seem my eyes didn't work correctly.

[piernov]

Re: Lenovo Flex 2 14" LF14M MB Please help me to identify component

Had a faulty EC on (I think) the same laptop. Partially shorting the 3V LDO output to ground, injecting voltage there made it eat more than 200mA but strangely enough it turned on and worked… Well, replaced EC and everything was working fine again.

[loser18]

Re: Lenovo Flex 2 14" LF14M MB Please help me to identify component

OK...

So I've replaced CPU & laptop finally started charging, but still didn't want to turn on.
Re-checked KBC main voltages & they were exactly the same.
After replacing KBC the laptop seems to be fully working now.

Thanks to everyone for help...