820-00291

[Mac Tech]

Greetings to all.

This machine does not have pp3v3_s5.

Voltajes en U7600

Pin 12: PM_EN_FET_P12V_S5_SSD (3.41V)
Pin 24: PM_EN_REG_P5V_S4_R (0.00)
PIN 17: PP12V_S5_FET_P3V3_S5_P5V_S4 (12.0V)
PIN 4 y 5: 0V

Pin 5 y 4 it's an LDO which is generated by the same u7600.

I changed it a couple of times and nothing.

I know I must have that LDO first.

no shorts on L7610 or L7650.

 

[2informaticos]

Check diode mode to ground on LDO5 and its coils.
Be sure to get good solders and check all traces too.

 

[Mac Tech]

L7650 Diodo: 436
L7610 Diodo: 435

PP5V_S5_LDO Diodo: 448

 

[2informaticos]

Check solders, traces and all U7600 surrounding components.
Be sure to use "C" version of the chip (ISL62383C),

 

[Mac Tech]

Solved, I made a mistake. Pin 12 PM_EN_FET_P12V_S5_SSD had no voltage, let me be guided by the voltage that reaches R7698 PM_EN_FET_P12V_S5_SSD. I thought that this entered pin 12 of the u7600 and it is not.

Analyzing well who arrives at that pin 12 is PM_PGOOF_FET_P12V_S5_SSD_K that comes from the u8490. Heat it up a bit and you're good to go.

Thank you. Apologies.

Thank you @2informaticos