HP 4730s some keys on keyboard not working

[ktmmotocross]

Hello.
Have this HP 4730s that some keys on keyboard not working. it was water spilled. cleaned, replaced keybord, but even with new keyboard, some keys are not working, like q w e r . connector looks clean, KBC looks ok.

how to check it?

[mosfetratus]

Re: HP 4730s some keys on keyboard not working

I/O controller is damaged? No other suspect for such problem.

[ktmmotocross]

Re: HP 4730s some keys on keyboard not working

everything looks ok. pins on kbc looks ok. measured 3.3V on most every resistor connected to connector

[mcplslg123]

Re: HP 4730s some keys on keyboard not working

did you checked pch area for corrosion?? I had similar problem on a hp 2000 mb and found corrosion near pch was the factor(Replacing kbc didnt worked.

[ktmmotocross]

Re: HP 4730s some keys on keyboard not working

yes, no corrosion and whole board was in ultrasonic bath