HP 14s-cf0002tu notebook water damage no booting repair

Machine model: HP 14s-cf0002tu
Board No.: 6050a2993001-mb-a01 (A1)
Fault phenomenon: notebook water damage no booting, power on indicator light is not on
Maintenance process:

HP 14s-cf0002tu notebook water damage no booting, power on indicator light is not on.

After dismantling the machine, it was found that a little water was fed into the 3V stand-by place, and the power was turned on after the treatment. There was no 3V in 5V, only 0.5V in 3V LDO, and no Short circuit in the later stage Diode value is normal.After disconnecting ldo3 test point, ldo3 can output 3.3V, chip screen printing L8 =, model rt6265b.

HP 14s-cf0002tu notebook water damage no booting repair Figure 1.
It was found that 6 pin en also had 0.5V power supply, which was abnormal. After disconnection, ldo3 output was normal, and en sent by EC also had 3V. This indicates that the problem lies in this. The chip and peripheral small parts are replaced, and the result is the same.Disconnect 6 pin en, disconnect the standby 3.3 test point,DC power supply add a 3.3 retest point back end,Connect the power supply source can be turned on.