820-4924 no trackpad and keyboard

[No-Clean]

Clean board, sometimes when the battery is disconnected and connected again trackpad and keyboard works fine for a few hours or days, but it always comes back with no trackpad and keyboard.

Board is perfect.

 

[2informaticos]

Does this only happens once logged in?
Check if you can access boot menu always.

Try known good trackpad board/flex.
Be aware of new chinese cables, many bad.

 

[No-Clean]

Thanks, when it happens even at login screen no trackpad and keyboard and no boot menu option.

So if the trackpad cable goes bad keyboard doesn't work?

Recently you helped me fix an Air with similar issues but that mode the keyboard and trackpad connect via the same cable, on this MBP they connect via different cables.

 

[2informaticos]

KB has separate cable, but after decoding its information goes to TP.
PCH gets all TP/KB information from TP board, via TP flex...

 

[No-Clean]

Ok great, where should I measure to check that is is not board level problem.

 

[No-Clean]

MBP came in with the problem, I did some measurements, put the board back in and it works again, this has now happened a few times in the course of 3 months.

 

[No-Clean]

I just ordered a new trackpad cable (pulled from working MacBook) will wait for that to come and test, thanks a lot for your guidance.