820-01814 no power

[Sr. Robot]

Hi, got an 820-01814 that doesnt turn on, no DFU mode, no signs of visible damage.

PPBUS_G3H : 0v

PP5V_G3S: 0v

PP3V3_G3H_T: 0v

PP3V3_G3H_T is 5.1v when using the upper left and lower right usb ports (looking at the board from the open bottom plate position)

 

[2informaticos]

You can't expect DFU without PPBUS_G3H.
Do you get 5V at R7020?

PLEASE, use schematic refference for components.
Locate it on boardview, then translate to schematic, if needed.

 

[Sr. Robot]

Yes, i get the 5.1 v in R7020

 

[2informaticos]

Diode mode to ground at PPBUS_G3H and 3V3_G3H_RTC?
If good, post U7000 basic voltages; P_IN, AUX_DET, SMC_RST_IN, VDDA/P, EN_MVR, A/BMON.
Also check resistance over C7020/23.

 

[Sr. Robot]

Diode mode:

PPBUS_G3H: 0.0002

3V3_G3H_RTC: 0.375

U7000 voltages:

PPDCIN_G3H_CHGR: 5.1v
CHGR_AUX_DET: 1.3v
CHGR_RST_IN: 0v
CHGR_VDDA: 5v
CHGR_VDDP: 5v
CHGR_EN_MVR: 0v
CHGR_AMON: 0v
CHGR_BMON: 0v


Resistance between C7020/23 is 60kohms

 

[2informaticos]

"Resistance between C7020/23 is 60kohms"
Pay more atention when you read; is not first time when I asked such checkings.
Do you really get 60k between C7020 pins???

"PPBUS_G3H: 0.0002"
No need to check U7000 voltages then.
Switch to ohm scale and see if any big coils shows the same value.
Start with CPU coils.

 

[Sr. Robot]

L7330 is 26 ohms to ground
L7420: 6 ohms
L7410: 10 omhs
L8102 : 75 omhs
L7701: 175 ohms

 

[2informaticos]

Check all coils, including SSD ones.
If none gives the same value as PPBUS_G3H, then is safe to use voltage injection method.
First remove F7000 and see which side the short remains.