820-02020-A Stuck 5V

[javier_herart]

Hello
I have this clean board stuck on 5V

-USBC1 takes 0.165A
-USBC2 takes 0.145A

Not sure how to start with this M1.

What is the equivalent to PP3V3_G3H?

PP3V8_AON: 0V

 

[javier_herart]

PPBUS_AON: 12.26V
PPBUS_VMAIN_VIN_ISNS: 12.26V
P3V8AON_PWR_EN_R: 5V

 

[javier_herart]

PP3V8_AON: 0.186V (diode mode) and 0.6KOwhm to ground

 

[2informaticos]

Do you get 3V8_AON voltage?
If not, check R5710.

 

[javier_herart]

I mentioned:

PP3V8_AON: 0V
P3V8AON_PWR_EN_R: 5V (on R5710)

 

[2informaticos]

Probably bad U5700...

 

[javier_herart]

Replaced U5700 and the board takes now 20V 0.200A when connected to UF500.

When connected to UF400 only 5V and the USB-C meter restarts.

Any idea? Thanks!

 

[javier_herart]

I measured the power sections, I coulndt find any clue.

UF400
PP5V_S2
PPHV_INT0_AONSW 0.543
PPVBUS_USBC0 0.139
PP3V3_S2_UPC
PP1V25_S2
PP3V3_UPC0_LDO 0.487
PP1V8_S2
USBC0_3V3LDO_EN 0.525
UPC0_SS 0.561
PP1V5_UPC0_LDO_CORE 0.504

UF500
PP5V_S2
PPHV_INT1_AONSW 0.543
PPVBUS_USBC1 0.142
PP3V3_S2_UPC
PP1V25 S2
PP3V3_UPC1_LDO 0.494
PP1V8_S2
USBC1_3V3LDO_EN 0.529
UPC1_SS 0.561
PP1V5_UPC1_LDO_CORE 0.505

 

[javier_herart]

Couldnt find any different measurement on the chips.

I replaced UF400 and the machine taking 20V y both ports.

Now, when connecting the screen I only get 5V on both ports. If I disconnect the screen I can hear it chimes.
I took out the board again and on the bench i do get external video

Any help?

 

[javier_herart]

I have PP5V_SW_LCD shorted to ground when connecting the screen (0 ohms)

When screen disconnected I got 58ohms to ground or 0.064V (diode mode)

-Any recommendation on the screen?

-The 0.064V sounds good?

 

[2informaticos]

Then you must change the screen.

I don't have comparison board for 5V_SW_LCD.