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(SOLVED) 820-01598 bootloop

Jeffotskie26

Jeffotskie26

Member
hello i have a2159 apple logo (bootloop)
itried dfu mode but cant detect by configurator2
got 20v usb meter.
btw board is clean no sign of corossion.
PPBUS_G2H 12.6v
PP3V3_G3H 3.3V
P3V3MAIN_PGOOD 3.2V
PP3V_G3H_RTC 3.0V
P5VG3S_EN 1.8V
PP5V_G3S 5.1V

PP1V2_AWAKE 1.2v
PP1V8_AWAKE 1.8v
PP3V3_AWAKE 3.3v

PP0V8_SLPS2R 0.8v
PP1V8_SLPS2R 1.8v
PP1V1_SLPS2R 1.1v

PMU_PVDDMAIN_EN 3.3v

PP1V8_S3_MEM 1.8v
PP1V2_S3 0.0v with 0.125 diode to ground is it normal?
 
Last edited:
Jeffotskie26

Jeffotskie26

Member
U8100
12 5.1v
6 1.8v
16 1.8v
17 1.8v
after i measured this now got
PP1V2_S3 1.2v with 0.125 diode to ground
but still bootloop.
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
Did you follow exact steps from DFU tutorial?

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...
boards.rossmanngroup.com boards.rossmanngroup.com
 
Jeffotskie26

Jeffotskie26

Member
im sorry for my stupidity, i press keys wrongly now i tried revive and restore success with no errors
please check on the video revive restore after this now no more display dont know whats the next step
 
Jeffotskie26

Jeffotskie26

Member
yes but this after the restore no display if u checked the video u can see the screen of other macbook looping the usb connection.
any idea?
 
Jeffotskie26

Jeffotskie26

Member
this solved after no more option thing to do i decided to spray the entire motherboard with electronic cleaner then
i reheat to make it dry using quick 2008 hotair 240/100
suddenly miracle happens.
 
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