Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Model : Lenovo Ideapad S340-15IWL Type 81N8
Board id: EL5C3 EL531 EL431 LA-H101P REV 1.0

Problem is "q" Key is stuck and appear repeadely without Keyboard. I flash BIOS from supported original lenovo website and BIOS and EC version are changed. But problem still exits. There is nothing (Capacitor, Diode, etc ... ) on Keyboard circuit line. All are directetly connect with EC. Need help.

Disconnect the keyboard while in the app (eg. Notepad) and check if "q" letter is still typed. If NOT, replace the keyboard. If SO, replace the EC.

I already tested with disconnect keyboard. When i replace EC, can i need to reprogram?

If you will use a brand new KBC chip (or a erased one), it should automatically program itself the first time you connect the power supply to the board.