Lenovo T470 keyboard keys connector problem

[kuraimangetsu]

Hi again.
i got another weird Lenovo problem today

the keys " R T F G V B 4 5" not working
Replaced the keyboard with two different new kbs
test on diode mode. red on ground and black on pins

10 pin oL
12 ol
19 OL
20 OL
22 OL
23 OL
24 OL
the 7th to the right is buzzing on diode mode with 0.000
all other pins are 0.600 - 0.900 on diode mode

so what to do now?
Do you think it is an EC problem?

[Stevedb]

Re: Lenovo T470 keyboard keys connector problem

inspect the traces to EC chip and also diode mode you must use plus to ground and black probe to the connector.

[kuraimangetsu]

Re: Lenovo T470 keyboard keys connector problem

inspect the traces to EC chip and also diode mode you must use plus to ground and black probe to the connector.

thanks for the replay.
and yeah that what i did. red to GND and black to pins (writing mistake up there. corrected)

how to keep tracing them? with diode mode? and what about the buzzing pin and ol pins that's not normal right?

[kuraimangetsu]

Re: Lenovo T470 keyboard keys connector problem

traced the resistances. 3 got 99 ohm and this one next to the cap is 574ohm

[kuraimangetsu]

Re: Lenovo T470 keyboard keys connector problem

was bad caps near the connector that's it

[Stevedb]

Re: Lenovo T470 keyboard keys connector problem

Good work sorry I was busy. Congratulations