820-3435 air trackpad and keyboard works only in boot menu

[ielectron]

trackpad and keyboard works only in boot menu

SMC , PRAM reset done. USB ports working, usb keyboard mouse works, i can boot from ext hdd, but same issue, customer said they replaced trackpad trackpad cable, i happen to have the same working board, that works fine, so it is a board issue for sure. I dont see water damage.

 

[ielectron]

screen backlight wont turn off when i close the lid

 

[ielectron]

i found a missing component, it was desoldered and removed, also there was glue around it originally, that was removed too, so Q4860 connecting to TPAD_SPI_CS_CONN_L was removed intentionally.
Now the trackpad and keyboard works in osx, but the fan is spinning fast, i guess it cant read the touchpad temp sensor, i will check that, and still wont sleep when the lid is closed

 

[ielectron]

i fully assembled it, now the fan is ok, maybe the wifi card was missing for it, so there is only one issue, it wont go to sleep when lid is closed

 

[aprendiz]

The lid sensor is on I/O board, this could be a bad I/O board or cable, inspect both for water damage also the connector on LB....