macbook a1707 820-00928

[PITERPENY]

there is no reaction, it hangs at 20 V/0A. There was a little corrosion in the u7650 area. Replacing the u7000 did not help. Tell me, what else could it be? PPBUS_G3H=12.9V
Flashing the bios with a clean region also did not work!

[mon2]

From Rossmann forums:

Post U7650 basic voltages: 23, 22, 12, 13, 29, 21.

SMC_PM_G2_EN comes high?
Are you using 87W charger?

[PITERPENY]

Post U7650 basic voltages:
23,=12.64V
22,=3.3V
12,=3.4V
13,=1.99V
29,=5V
21.=3.4V

SMC_PM_G2_EN comes high? = 3.4 V
Are you using 87W charger? = used 100W

[mon2]

Try..

"SMC bypass mode"
Put SMC_ONOFF_L to ground, connect charger, maintain contact 5-10s; board should start when you release SMC_ONOFF_L.

Remember to work with board alone, nothing connected apart of charger (no battery).

[PITERPENY]

when connected to all 4 ports, the same behavior is 20V / 0A, the consumption of 0A is fixed, not the slightest consumption from the moment of connection.

[PITERPENY]

Put SMC_ONOFF_L to ground, connect charger, maintain contact 5-10s; board should start when you release SMC_ONOFF_L.
The power tester reboots and still no changes, I tried several times(

[mon2]

What is the voltage to ground of:

PP3V3_S5
PP5V_S4

[PITERPENY]

PP3V3_S5=3.3v
PP5V_S4= 0v

[mon2]

Remove all power -> meter in resistance mode -> measure the resistance to ground of PP5V_S4.

Also confirm, the voltage to ground of the EN1 signal @ P5VS4_EN_RCD. Carefully measure this at the IC.

What is the voltage to ground of ALL_SYS_PWRGD ?

[PITERPENY]

PP5V_S4= 8,23 kOhm (0.390 diod mode)
P5VS4_EN_RCD =0V (46 kOhm)(0.457 diod mode)
ALL_SYS_PWRGD=0V(8.5 kOhm)(0.416 diod mode)

[mon2]

With no power to the board, meter in resistance mode, measure the resistance to ground of each inductor (usually grey in color). Checking for shorts on the power rail.

[PITERPENY]

diod mode/resistance
L7030=0.413/43.6kohm
L7960=0.33/71.5ohm
L8000=0.18/52.9ohm
L8020=0.388/8.14kohm
L7900=0.215/0.695kohm
L7600=0.393/8.32kohm
L7660=0.252/2.030kohm
L8410=0.778/35.5kohm
LB700=0.230/1.697kohm
LA300=0.018/54.2ohm
LA350=0.013/40.3ohm
LA650=0.000/2.7ohm
LA640=0.000/2.7ohm
L7330=0.007/23.2ohm
L7231=0.000/4.2ohm
L7221=0.000/4.2ohm
L7211=0.000/4.2ohm
L7420=0.001/6.7ohm
L7410=0.001/6.7ohm
I don’t find a short circuit, maybe the problem is in the SD3215?

[mon2]

You have 20V so that implies that each CD3215 is operational. You can test by testing each USB Type C connector and also by rotating the USB C connector head by 180 degrees to confirm the operation of each side of the USB blade.

Check the voltage to ground of each pin of the main SPI flash ROM.

[PITERPENY]

U6100
1=1V
2=0.022V
3=0.027V
4=0
5=0
6=0.022V
7=0.020V(hesitate)
8=0.

all 8 sides of USB-C have the same readings

[PITERPENY]

PP3V3_SUS=0V

[mon2]

Check the resistance to ground of this missing power rail. No power during this resistance testing.

[PITERPENY]

PP3V3_SUS=0V .DIOD=0.320 .RESISTANS=2.8 kOhm

[PITERPENY]

where is PP3V3_SUS formed?

[mon2]

See attached (U8200). Carefully review the voltage to ground of this critical load switch.

PP3V3_S5 must enter this load switch

EN signal of PM_SLP_SUS_L = '1' = ~3v3 then output will be the PP3V3_SUS to further power other devices.

[PITERPENY]

I removed f7000 and f7001 and my consumption is 20V but 0.000A is stable, I think the problem is in the power circuit and this is the CD3215. What do you think?