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I meant to check on that power rail (LDO), where you've said to have lower reading than expected.

Did you check diode mode once U2890 was removed? Each chip has a filter cap near the power pin.

If S5 LED goes off, test replacing Q8110.

Not sure which chip may be involved only with this issue. Sometime bad flex can cause such problem; you've said already tested. https://boards.rossmanngroup.com/threads/macbook-air-m2-a2681-touchpad-keyboard-issue-lid.64702/ One friend mentioned he directly changed all small chips related with...

Check if board starts with airport connected and just one RAM module inserted.

Just for test, interchange trackpad board/flex between both machines; if are the exact same model/year.

Is the machine recognized in DFU mode?

Did you test after changing U3404? If the MOSFETs have the same pin output, no problem to replace.

What about U8100 and U7700 LDOs?

Just in case, test on good machine if trackpad works correctly without daughter board connected.

It should work.

So problem appears only when the airport card receives 3.3V power. Try replacing Q3403 and/or U3404.

The chips from page 57 are simple level shifters, no firmware included. Try to find a LSF0101 from other board.

Replace UD102...

You should get similar reading as 5V_S4_T_USBC.

On some point of T-CON, you should get 50V aprox; near the backlight connector. If not, change the small video cable. BTW, always check in diode mode with red probe connected to ground!

Resolder all components. Then install airport card and isolate 1V5_S0_MINI line (only). Test if starts...

I still suspect overcurrent triggered for 1V5_S0, or 3V3_S0 power rails, once airport card is connected. 3V3_S0 has now good diode mode reading?

Check diode mode to ground at J3300 & JB500 lines; compare with good board. S-UEM2 tool can help you.