Solved: I did replace the flex cable, no positive effect. so, I did order un new trackpad and replaced it. It works ! I think the old one did break during the battery replacement because of mechanical stress (the battery had expanded…)
Great tutorial, thanks to authors.
Unfortunately, after having successfully replaced the battery, the trackpad & keyboard don’t work anymore.
Yet I did all steps very carefully. I did reset VRam, SMC but got no effect. External USB keyboard & mouse are working well.
More, the trackpad seems to be very hard to press (to get a “click”).
I’ve ordered a new trackpad flex cable (quite easy to replace), hoping this solve the problem.
Has somebody else already experienced the same ?