820-4924 no boot with trackpad cable connected ( known good )

[Yoel Ren]

this macbook came in with no display problem, changed u8300, then display is good.
headphone jack need replacement too.
checked j4802 and the backside no corrosion too.. any idea ?

 

[Yoel Ren]

solved : the trackpad itself is bad
but does anyone know how to fix it ? or is it treated like consumable part ?

 

[2informaticos]

Try to clean corrosion, if visible...