Lenovo SL510 Keyboard issue - bad unidentified resistor

[Monument]

Hello, recently got a Lenovo SL510 laptop. The laptop had a coffe spill, I cleaned it up, put it back together, the keyboard worked just fine. After the laptop had not been used for two weeks, the keyboard stopped working. So I took it apart again and removed the stickers on the motherboard to find any residue. What I found was bad, the coffe got under one sticker and was already "eating" the components, I cleaned the board with a toothbrush and alcohol and found a resistor that was not working and looked very bad, I can't identify the value of the resistor, or maybe it's a small SMD diode?
The small red mousethingy is working fine, also external keyboard is working. I am out of ideas guys.
Maybe someone can help me find a schematics of the motherboard, Monument.

[Monument]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

I can't find the schematics anywhere.

[robrock1]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

hello, is this the schematic for it?

[Monument]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

No sir, it's not. When I check for an example "R345", the values are different from the ones in this pdf file.

Here's the image of this area.

[Monument]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

I am out of ideas.

[Francisco.s]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

I am out of ideas.

Clean this zone of PCB, and post new photo.

[Monument]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

I took out the resistor, it was very oxydated, couldn't tell the value, even the surrounding PCB is a bit damaged.

[Francisco.s]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

Are Q17 and U26 in contact through any of its pins?
The quality of the photo is good, but I can not see the name of U26.
Could you post it?
Is there a motherboard code number?

[Monument]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

One end of the resistor should be in contact with the transistor. I believe the motherboard code is dagc3amb8 and I read
"KXTC8
20020
1511"
on U26 chip.

[Francisco.s]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

I believe the motherboard code is dagc3amb8

I think this is the code, but I haven't this diagram.
See if this diagram helps.

[Monument]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

I think the resistor is R349 with a value of 1Mega ohms.

[lezsimply]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

yes it is

[khaahk]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

Schematics can be found via google. Still, replacing the resistor should not make the keyboard work. The keyboard itself might be damaged.

[Monument]

Re: Lenovo SL510 Keyboard issue - bad unidentified resistor

Yes, it didn't fix the keyboard, however, the laptop seems to work just fine, external keyboard is also working fine so I assume the keyboard is malfunctional.