820-3462 no trackpad

[Kyle93]

Arrived not turning on from minor liquid damage on trackpad itself. Replaced with known good trackpad and cable. Keyboard works and trackpad clicks but does not track. Board itself has no liquid damage.

What to check first? Can bad U5701 cause this

 

[2informaticos]

Do you get both voltages for J5700?
Check all traces between J5700 and U5701.
Try another trackpad cable, many chinese cables are crap...

With patience, you can check all the connection between U5701 and the pins of the connector in the trackpad board.

 

[Kyle93]

yes both voltages are at J5700

Traces are fine.. no damage of any sort on the board.

continuity between J5700 and cpnnector on trackpad board are good

 

[2informaticos]

Try another trackpad board too.
You can also change U5701, just in case...