Macbook A1932 Some Keys Not Working

[astroboypaul]

Macbook A1932 had completely dead keyboard. I found liquid damage on circuitry on keyboard itself, and repaired it by replacing what i think was a 10k 0201 resistor (here's my post requesting schematic for keyboard circuitry where I included a photo of the resistor: https://www.badcaps.net/forum/troubl...ic-820-01294-a)
Now most of the keyboard works and I can login, but the following keys don't work: Delete, "/', left arrow, down arrow, (right) option, fn
I'm suspecting some more liquid damage exists that I missed. Could damage to a single trace on the keyboard affect all the above keys at once?

[mon2]

Could damage to a single trace on the keyboard affect all the above keys at once?

Yes. Keyboard scanning works in scanning rows & columns of contacts so if a single trace is broken then a group of keys can fail.

Suggest to replace the keyboard. Plan B is to trace where this mystery component ends up by scraping off the component edge glue / protective sealer with a low heat. Then perform point to point (diode mode should be ok) tracing between the pad and the I2C expander IC that is nearby.

The datasheet for the IC is available:

PCAL6416A - Low-voltage translating 16-bit I2C-bus/SMBus I/O expander with (nxp.com)