820-00239 does not accept commands

iClub

Member
presents the folder with interrogation, I have already tested the external keyboard, disconnected the flats and used a Bios file ok, but without result.
 

2informaticos

Administrator
Staff member
Cannot access boot menu?
Did you try to boot USB macOS?
Is J9600 installed?
 
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iClub

Member
It is connected j9600.
The boot menu does not appear and when holding CMD + R it does not appear either. It is only on the INTERROGGATION PASTER.
 

iClub

Member
same thing stays only in the INTERROGATION PASTE.I tested it with another keyboard and apartment. I disconnected the peripherals, but I didn't have a different result.
 
Last edited:

iClub

Member
yes I did. the following message appears “the software needs to be restored, as there is a critical system error”. Trackpad and wifi don't work on this screen.
 

2informaticos

Administrator
Staff member
Did you try all steps recommended for critical error on touchbar machine???

 

iClub

Member
PP3V3_2V7_NAND_VCC 0v.
PP1V8_SSD_COLD 0V
STORAGE_LB_EN 0.42V
SSD_RESET_LB_L 0.42V
LPSR_EN_LB_L 1.34V
SSD_PCIE_CLKREQ_LB_L 1.34V
SSD_BOOT_LB_L 0.81V
R9406 2.2ohms
 

iClub

Member
There is no SSD/NAND short in reference to the ground.

Still cannot access USB boot?'' I cannot enter the boot menu.

I identified that R9350 has 200k instead of 1.3M, replace with an equivalent, but I didn't get a result.
 

iClub

Member
STORAGE_LB_EN 1.55V
SSD_RESET_LB_L 1.73V

PD_L 0.75V

SSD_PCIE_CLKREQ_LB_L 1.75V

"Be sure J9600 has good contacts" are all good.
 

2informaticos

Administrator
Staff member
"3V3_S5_SSD 766mV"
Do you also miss PP3V3_S5_SSD_LB?
If yes, bad contact on J9600.
Be sure no short at PP3V3_S5_SSD_LB and then you can bypass J9600 with an wire.
 
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