820-01958: PP5V_g3S Unstable/Pulsing

[macRepairAmb]

Have yet another board with no power. 20V present but no current draw. Notice PP5V_G3S is unstable and pulsing.

PM_SLP_S4_L - 0.0
PP5V_S5_LDO - 5.03
PPVIN_G3H_P3V3G3H - 12.3 and stable
PPVIN_G3H_P5VG3S - 12.3 and stable
PP3V3_G3H - 3.3 and stable


P5VG3S_EN_DLY - pulses also

Any suggestions on this one.

 

[2informaticos]

Any history available?
SSD voltages present?
Did you try DFU?

 

[macRepairAmb]

PPVCC_NAND_SSD0 - 0.0

The board does look like it had been cleaned in the past but i can't find any corroded components.

Yes, i did try DFU and it failed with an error.

 

[2informaticos]

Check diode mode to ground on big coils
Also check at SSD power rails...

 

[macRepairAmb]

what page is the ssd power rail for this model

 

[macRepairAmb]

PPBUS_G3H_SSD0 - 12.3
PVCCNAND_EN - 0.0

 

[macRepairAmb]

diode mode reading of big coils

L7670 - 0.43
L7690 - 0.39
L7030 - 0.48
L7400 - 0.2
L7230 - 0.06
L7220 - 0.06
L7210 - 0.06
L8410 - 0.86
L8100 - -0.08
L9060 - 0.41
L6520 - 0.43

 

[2informaticos]

1V8/3V3_G3S pulsing too?

 

[macRepairAmb]

yes 1V8/3V3_G3S both pulse

 

[2informaticos]

What error do you get on DFU?