MSI Pulse GL66 11UDK

[YKMN]

Hi everyone,

I have here Pulse GL66 11UDK, when i connect charger the power led is blinking slowly 3 times after that no sign of life.
When i disconnect the KB ribbon and Cmos battery laptop boot without problems every time i connect and disconnect charger.
When i leave the KB disconnected (assuming its broken) and connect only the Cmos battery, laptop power up once and after disconnecting and connecting charger again no sign of life expect 3 slow power led blinks.
Tested with and without battery - same behaviors.
Bios cleaned ME and updated to newer version.

Anyone have any idea what to test more, where to search for problem.
Could that be an option that KBC firmware is somehow corrupted, because of KB ?

[mon2]

Remove the CMOS battery but keep the keyboard connected. Does it boot every time?

[YKMN]

CMOS battery removed (also battery not connected), keyboard connected - no boot only 3x slow blinks power button

[YKMN]

Update
Maybe it will help somebody, after changing KB for new one, everything working correct again.