Toshiba L500 not detecting internal keyboard

[dragometin]

I have a Toshiba l500 with LA-4981P motherboard, and the internal keyboard is not working. I already replaced the keyboard. Checking the schemathic all keyboard traces go to the super io. So i resolder all the chip legs but the keyboard still isn't working. If i use a usb keyboard Num lock and caps lock light are working fine. What can i do from here?

[Techtiger]

Re: Toshiba L500 not detecting internal keyboard

Check pin 34 4 for Voltage check rest of the pins for any damage , check in bios post for any options disabled keyboard

[dragometin]

Re: Toshiba L500 not detecting internal keyboard

Thanks for reply

Both voltages on pin 34 and 4 are 3.27v
No errors in bios post
No options to disable keyboard in bios
Later i found there are some caps involved in the keyboard circuit. Checked the caps for shorts. All OK.

[caspian]

Re: Toshiba L500 not detecting internal keyboard

Now, while the laptop is off, check resistance on JKB1 pins with and without the internal keyboard to discover whether any pin is shorted.

[Techtiger]

Re: Toshiba L500 not detecting internal keyboard

Try to clean the keyboard connector is the new keyboard ribbon cable fix inside correct, may be connection between SIO and rest of the pins are bad you can do a continue to test , backup you old DUMP and flash bios