820-3662-a

MarcinRdm

Member
MacBook Pro A1398 stuck on Apple logo with trackpad flex. Replacing the trackpad and tape does not help. Only turns on without trackpad flex in the motherboard - J4800. I did a pram and SMC reset. Please help.

PP5V_S5_CUMULUS - 5v
PP3V3_TPAD_CONN 3v
R4800 and R4808 are ok
 
Last edited:

2informaticos

Administrator
Staff member
You can't start ASD at all?
Can you access boot menu at least?
Disconnect keyboard, let only trackpad connected.
 

MarcinRdm

Member
I can't run ASD with trackpad flex.
I can't access boot menu.
With the keyboard disconnected MacBook stuck on Apple logo.
 

MarcinRdm

Member
Diode mode shows no differences.
Test ASD stuck on CPU test.
Hear a jammed chime during startup with trackpad flex.
 
Last edited:

2informaticos

Administrator
Staff member
Can you start in SMC bypass with both charger and battery connected?
The "new" battery was tested in other machine?
 

MarcinRdm

Member
SMC bypass does not help.
The battery is tested and operational.
MacBook with battery loops startup sound.
Only disconnecting the battery or the trackpad flex helps.
 

MarcinRdm

Member
I tested on 3 different batteries.
I noticed that PPBUS_G3H without battery has 12.56v and with about 11v. - on three different batteries
 
Top