820-4924-A No Trackpad or Keyboard

[No-Clean]

Clean board, trackpad/keyboard don't work either before or after OS loads, already tried known good trackpad/flex/keyboard even tested it on a different case and same thing.

External mouse and keyboard does work fine

Alt key doesnt work so no boot menu but even before boot there is no trackpad

Tried clean BIOS same thing.

New U4910, U4820, U4830 same thing

U4910 related resistors are all fine

R4902-04 OKAY

Diode reads on J4802 are on par with good board and J4802 looks clean and good

pp5v_s4_tpad_f 5.19v
pp3v3_s4 3.33v
smc_lid 3.3v
smc_pme_s4_wake_l 3.297v
tpad_spi_if_en_conn 3.33v
PPVIN_S4_TPAD_FUSE 12.6V

 

[2informaticos]

Check TPAD_VBUS_EN and TPAD_SPI_BUS_EN, before and after macOS is loaded.
These lines must have complementary voltages.

 

[No-Clean]

TPAD_SPI_BUS_EN Before 3.3V - After 0V
TPAD_VBUS_EN Before 3.3V - After 0V

 

[2informaticos]

These are complementary signals; shouldn't have the same voltage.
Post U4910 voltages, in both cases.