820-3662 - Sometimes no Trackpad and Keyboard after sleep

[phuketmymac]

Hello,

I have that board on which we've replaced the whole topcase (kb + tp) but same behavior.
It will sometimes works fine after sleep but sometimes you just get no TP+KB. External USB mouse and keyboard will work fine however.
I can see the caps lock light on when this is happening.

Any idea which area I should look at first?
Thank you.

 

[dukefawks]

When it is not working is the TP+KB recognized as a USB device?

 

[phuketmymac]

Hello Duke,

It seems yes as it still shows up in the system report...

 

[dukefawks]

Probably on the TP interface. Inspect connector and traces for corrosion/damage, maybe bad U5701. This is probably going to suck