820-4924 power but no boot with trackpad plugged in

arghhh

New member
820-4924 liquid damage, C5125 and R5489 were corroded so I replaced them and it turns on now, however once I plug the trackpad in it chimes then gets stuck at a blank black screen before the Apple logo. Already tried a known good trackpad and cable, and the trackpad does click when it is on. Ideas?
 
Top