820-01041 Flux All Over The Board, No Power

[brunomotter]

Hello. Got this rabbit hole from hell here with no power. Charger negotiates 5V on all ports. Around 250mA power draw on all ports. Machine enters DFU, but does not complete restore neither revive option. Board has been well poked around by another store and it got flux on the whole board, including around T2 chip (shit!). I think maybe they killed T2 with heat.

PPBUS_G3H is 12.25V
PP1V1_UPC_XA_LDO_BMC - 1.18V
PP1V8_SLPS2R - 1.8V
PP1V8_UPC_XA_LDOD - 1.8V
I2C_UPC_XA_DBG_CTL_SCL - 3.34V
I2C_UPC_XA_DBG_CTL_SDA - 3.34V
PHV_INT_XA_G3H - 0V
PP3V3_G3H_RTC_X - 3.34V
PP3V3_UPC_XA_LDO - 3.34V

 

[2informaticos]

Do you have all SSD voltages present?

Is probably time wasting, other service may have removed components, or made more damage on the board...

 

[brunomotter]

Will post everything with SSD on name:

HS_P3V3_G3W_SSD0_OUT = 0V
HS_P3V3_G3W_SSD1_OUT = 0V
HS_PBUS_MAIN_SSD0_OUT = 0V
HS_PBUS_MAIN_SSD1_OUT = 0V
I2C_SSD0_SCL = 1,8V
I2C_SSD0_SDA = 1,8V
I2C_SSD1_SDA = 0V (probably because SSD1 is not present on system)
I2C_SSD1_SCL = 0V
I2C_SSD_SCL = 1,8V
I2C_SSD0_SDA = 1,8V
ISNS_P3V3_G3W_SSD0_N = 3,3V
ISNS_P3V3_G3W_SSD0_P = 3,3V
ISNS_P3V3_G3W_SSD0_N = 0V
ISNS_P3V3_G3W_SSD0_P = 0V
ISNS_PBUS_MAIN_SSD0_N = 12,25V
ISNS_PBUS_MAIN_SSD0_P = 12,25V
P0V9_LX0_SSD0 = 0V
P1V8_LX0_SSD0 = 0V
P0V9_LX1_SSD0 = 0V
PP2V5_NAND_SSD0 = 0V
P2V5_SW2_TPS62180_SSD0 = 0V

 

[2informaticos]

DFU can't be completed if no SSD voltages present.
Dig around U9000/80.
Check diode mode to ground at L9020/30/80.

 

[brunomotter]

Hello. I'm suspecting U9000 is bad, because I have some voltages around it, but it seems not to be outputting expected signals... I have:

SSD0_OCARINA_FORCE_EN = 0V
PP1V8_SSD0 = 0V
SSD0_OCARINA_IREF = 1,130V
SSD0_OCARINA_VDD_LDO = 1,5V
PP3V3_G3H_SSD0_SNS = 3,3V

Diode mode on coils:

L9020 = 0,165
L9030 = 0,320
L9080 = 0,338

 

[2informaticos]

You can use a T2 power on sequence from available boards; 01598 and 01055 must be somewhere on the forum.
And check the previous signals required by SSD.

 

[brunomotter]

I'm following this power sequence diagram: https://logi.wiki/index.php/CD3217_and_T2_Power_on_Sequence

I have all voltages up to PCH_RTC_RESET_L. From P5VG3S_EN forward I have nothing.

 

[2informaticos]

DFU revive should solve the power on sequence, if btoken because of T2 firmware corruption.
Seems that you have problems with secondary power supplies, or T2 with internal problem.

P3V3MAIN_PGOOD comes high?