Macbook A1706 820-00923

[ipetro]

hi
20V 0.200A
no image
where to begin ?

 

[2informaticos]

What about PPBUS_G3H?
Board switches to 20V w/ and also w/o battery connected?

 

[ipetro]

PPBUS_G3H=12.09V
20V 0.200A no battery
20V 2.200A battery conected

 

[ipetro]

The image is not displayed on the internal or external display.
The fans don't spin, the caps lock doesn't light up, the touchpad clicks

 

[2informaticos]

Which big coils get voltage?
Did you try SMC bypass?

 

[ipetro]

Did you try SMC bypass? No ! How ?

 

[ipetro]

L7030=13,08v\diod mode 0.436
L8410=0.012v\diod mode 0.778
LB700=0v\diod mode 0.129
L9400=2.7v\diod mode 0.335
L7660=3.35v\diod mode 0.322
L7600=5.13v\diod mode 0.387
L7700=1v\diod mode 0.123
L7900=1.2v\diod mode 0.165
L7960=0.95v\diod mode 0.016
L8050=1v\diod mode 0.008
L8000=1v\diod mode 0.010
L7270=1v\diod mode 0.002
L7220=0v\diod mode 0
L7210=0v\diod mode 0
L7410=0v\diod mode 0
L7420=0v\diod mode 0
L7430=0v\diod mode 0
L3500=0v\diod mode 0.121

 

[2informaticos]

Forget SMC bypass, you have almost all voltages, except VCORE.
However, Google knows something about SMC bypass; for the future.

Try known good BIOS.

 

[ipetro]

I replaced the BIOS chip from another identical board, no changes! could you give me your bios?

 

[ipetro]

To reset SMC and NVRAM you need a keyboard, but as I wrote earlier, the touchpad clicks but the caps lock does not light up green when pressed, which means the keyboard does not work.it's just stuck at 20v and 0.200-0.218a

 

[2informaticos]

As I said, forget SMC bypass.
I asked about it in my first reply, when I didn't know almost anything about your board.

 

[ipetro]

I replaced the BIOS chip from another identical board, no changes! could you give me your bios?

 

[2informaticos]

820-00923-05 OK clean.BIN

drive.google.com

 

[ipetro]

Thanks for the BIOS, unfortunately the behavior remains the same! no change 20V 0.215a

 

[2informaticos]

Probably bad PCH/CPU...

 

[ipetro]

There are two options: bad T2 and bad CPU. And as I understand it, it’s impossible to check either one or the other?

 

[2informaticos]

This board doesn't have T2 chip.
VCORE generation is controlled by PCH, BIOS and CPU.

 

[ipetro]

I removed the cable on the J8500 connector and found a burnout between PP5V_S0_ALSCAM_F and GND, possibly due to water damage. Maybe this will help determine the malfunction (no short circuit was found)!

 

[2informaticos]

Check diode mode to ground on J8500 data lines; compare with good board.
Use S-UEM2, if available.