A2681 Water damage, trackpad works but no haptic feedback, keyboard not working.

[fixupp]

I tried to replace the damaged component from a donor board, testing with multiple known working trackpads, trackpad cables, keyboards, small keyboard boards, and a new lid sensor, but still can't get the keyboard working. Trackpad works, but no haptic feedback

 

[2informaticos]

What is exact 820-xxxxx code of your board?
What damaged component found on the mainboard?

 

[fixupp]

Sorry board number: 820-02536
I have replaced the components near the trackpad connector JT400. I can see resister burned and need to clean the pad before replacing with new one. Replaced the followings:
RC852, RC832, RC850, UC850 UC840 UT380 UD230 UT3B0 UT3C0

 

[2informaticos]

Just for test, replace LT400 with a jumper.

Be sure all LT20x from page 85 are good.
Check if you get corresct power rails on JT201.