Asus P50IJ no power on (Main K50IJ REV 2.3)

Good morning Friends of the forum. This laptop shows up that does not go into power on. The battery charging led lights up (with the battery inserted I have an absorption of 70 miliamps).
I found no traces of oxide. I find the voltages of 3.3V on L8102 and 5V on L8101. The machine does not react to the power on. No voltage rises on the other coils. Absorption remains at 0A (without battery).
I checked the voltage + 3VA_EC and it is present. VSUS_ON is present. SUS_PWRGD is present PM_RSMRST # is present PWR_SW # measures 3.3V and drops to 0V when I press the power button. What I noticed is that the PM_PWRBTN # signal does not drop to 0V when press power on button. I also tried to replace the KBC but nothing to do, it remains fixed at 3.3V. Before changing the kbc I had tried to reprogram the bios but nothing. I tried to replace the cpu but same problem.
Measuring in the coils, I did not find short, the coils that feed the cpu have 14 Ohm with the cpu inserted. The one I found low is the L8201 which measures 14 ohms

Measure voltages on pin 12, 21, 82, 83, 107 of KBC.

Hi Machine
pin 12 1,84v
pin 21 0v
pin 82 0v
pin 83 0v
pin 107 0v

Communication with the South Bridge is missing.
It's probably faulty.
Try a South Bridge reflow.

Thank's Machine
I tried a reflow at the southbridge but nothing to do. The customer is sure to opt for a replacement motherboard due to the low cost. I heartily thank you for your help