[help] 820-01958 dead: 20v not switching

[phantomEVO]

I've check also about u7800 ldo..


LDO_CORE 1,49
PP0V8_SLPS2R 0v
PP3V_G3H 0v
PP1V2_AWAKE 0v
PMU_LDO3_OUT 1,79v
PP1V1_SLPS2R 0v
PP3V3_G3H 2.4v
PP1V8_SLPS2R 0v
LDO_RTC 1.67

[phantomEVO]

i think that the power supply for pm is PP3V3_G3H_PMU_VDDMAIN


how can i pretend to have ldos if PP3V3_G3H_PMU_VDDMAIN is 2,4v????

so i think that before pp3v3 i should have PPBUS_G3H

but PPBUS_G3H is 12,28v!!

and like i read here

https://repair.wiki/w/MacBook_Air_A2...w_at_5V_repair

PPBUS_G3H is created by the Intersil/Renesas ISL9240 (U7000)

If you are getting 5 V on PPDCIN_G3H, the ISL9240 is likely the cause of the problem

i have already check the current sensors....

so i think i should change u7000 what do you think?|

[mon2]

No. You are confusing ppbus_g3h with PP3V3_G3h.

Post #5 has a valid voltage for the initial value of ppbus_g3h.

(Back to my beauty sleep)

[phantomEVO]

mon, ppbus_g3h is 12,28 ! i should have 12,6!

ps goodnight

[mon2]

Test the voltage to ground of the smbus scl and sda lines used by the ISL9240.

Test the same on the battery connector.

[phantomEVO]

on r5240 0v
on r5241 0v

0,v
SMBUS_3V3_BATT_SCL
SMBUS_3V3_BATT_SDA

measured on d6950

[mon2]

Remove all power. Measure the resistance to ground of:

SMBUS_3V3_BATT_SCL
SMBUS_3V3_BATT_SDA

[phantomEVO]

30k both

pardon: on

SMBUS_3V3_BATT_SCL
SMBUS_3V3_BATT_SDA


I HAVE 2,4V (for me strange, because i soon as i connect usb power, i find only 0,98 that increase slow until 2,4)

[phantomEVO]

is it possible that all problems are generated from PP3V3_G3H LOW ???!??!?! (2,6V INSTEAD OF 3,3?)

[mon2]

What is the voltage to ground of PP3V3_TBT_X_S0?

[phantomEVO]

0v

[mon2]

What is the voltage to ground of PP3V3_TBT_X_SX?

Test with external power adapter on each USB C port.

[phantomEVO]

i've discovered something (i think ) interesting

if i connect the usb port corresponding to u3200, i have this

https://www.dropbox.com/scl/fi/jpbth...=cffslxna&dl=0


you see? half of u3100 become hotter and a quarter of u 3200 flash...

this trange thing doesn't happen if i connect the cable to u3100

PP3V3_TBT_X_SX 0v

[mon2]

I don't see the issue in the posted video. Confirm if you have the power rail (post #32) using one of the USB-C ports. This is important as the CD321x create this LDO rail.

[phantomEVO]

try to rewatch the video...at minute 0.05 you can see what i say...


PP3V3_TBT_X_SX not presente like i said before

[mon2]

1) Are you testing the above power rail with each USB-C port?

2) With no power to the board - What is the resistance to ground of PP3V3_TBT_X_SX? Also test in diode mode. Red meter probe to ground. Black meter lead to PP3V3_TBT_X_SX. What is the measurement?

3) This case goes back to the CD3215 20V article. Need to be sure each LDO rail is functional.


https://logi.wiki/index.php/CD3215_Bootup_Sequence
* follow this power sequence and post details of what is failing

[phantomEVO]

1,47k
0,440

i have no shorts around those chips

[mon2]

Similar logic flow in debugging.

Search for 'LDO_3V3' and this should land onto the CD3217 balls that create this rail. Be sure to test each USB-C connector to test each ACE controller.

[phantomEVO]

on u3200

PP3V3_G3H_RTC 3,3v
PP3V3_UPC_X_LDO 3,3v
PP1V5_UPC_X_LDO_CORE 1,5v

on u3100 all are 0v

[phantomEVO]

same diode mode values on all lines...