Macbook A2337 A and D

[Instafixx]

Only A and D working on the keyboard.
Customer had their motherboard replaced from Apple. They had also quoted for the topcase for keyboard issue but the customer declined.

Tried a Known good keyboard.
Installed the board on a known good chasis.
Still the same. Only A and D work. Nothing else

Weird Issue.

 

[2informaticos]

Really weird.
No reaction at all on any other key?

KB information goes to M1 through the same SPI bus as TP.
Check all IPD related components from page 77.

 

[Instafixx]

Everything looks okay to me.
Installed this board on yet another chasis. and in this one it works properly.

I am so confused.
Even used this working trackapd and flex on other chasis and keyboards but the same.