Mac A1502 820-4924-a No Keyboard no Trackpad

[zcinciev]

PP3V3_S5 3.3v
PP3V3_S4 0.1v
PP3V3_S4_FET_R is missing on U8000... u8000 Bad?

Edit: Reflowed u8000 now i got 1.1v on PP3V3_S4

 

[2informaticos]

Diode mode to ground on 3V3_S4_FET?
If OK and also =P3V3S4_EN is present, then change U8000.
If no good, check disconnecting RIO power connector and trackpad flex.

 

[zcinciev]

Diode mode 3V3_S4_FET 0.104

It's strange now i get IN and OUT voltage on U8000.

all measured just board plugged in

 

[2informaticos]

Still not working?

 

[zcinciev]

no Still not powering on

 

[2informaticos]

Wait, your board has non working TP/KB or is not starting at all???

 

[zcinciev]

The board was powering on and now All magically started working trackpad and keyboard... testing now but all seems good Thanks 2informaticos

 

[2informaticos]

Clean both terminals of TP flex, as its connectors too.