A1932 (820-01521) 5V no boot

[Vonevoe]

Hello,I'm reaching out to you again. No, I haven't solved yet the problem with the A1707, but why not continue on this track?

I am currently working on a machine that has some oxidation.
I have changed the CD3215 U3100 and repaired the PPVBAT_G3H_FUSE between Q7070 and Q7065.
We're stuck at 5V; the LDO line from pin 53 of the U3100 is not present (PP3V3_UPC_XA_LDO).
There is no short circuit here.

 

[2informaticos]

Both USB-C ports have the same behavior?
Do you get PPBUS_G3H and 3V3_G3H_RTC?

 

[Vonevoe]

I am encountering this issue on the U3100 board, and it persists regardless of which USB-C connector is connected. Specifically, I am unable to obtain readings for PPBUS_G3H and 3V3_G3H_RTC.

 

[2informaticos]

USB input can't switch to 20V without 3V3_G3H_RTC; which requires PPBUS_G3H first.

Post diode mode to ground at both mentioned power rails.

 

[Vonevoe]

Understood, here's a reformulation:

I'm seeing the following readings:

• 3V3_G3H_RTC = 0.460
• PPBUS_G3H = 0.406
  I've examined both the schematic and the openboarddata, and it appears that the values seem to be incorrect. How should I interpret these values, and how can I make use of them effectively?

 

[2informaticos]

Post U7000 basic voltages: P_IN, AUX_DET, SMC_RST_IN, VDDA/P, EN_MVR, A/BMON.

 

[Vonevoe]

P_IN = 5.18 V
AUX_DET = 1.2 V
SMC_RST_IN = 0
VDDA = 5.10 V
VDDP = 5.10 V
EN_MVR = 0 V
AMON = 0.004 V
BMON - (i2.6 V ~ 2.7)

(What do MVR, AMON, and BMON stand for?)

 

[2informaticos]

"BMON - (i2.6 V ~ 2.7)"
I don't know how to interpret this; should be 0V, like AMON.
If not, check R7061/2 and their traces.