MacBook A1466 notebook into the water does not open the machine repair

Machine model: MacBook A1466

Malfunction: Notebook water damage can’t be turned on.

Maintenance process: the machine water damage can be charged after treatment, or discharged by unplugging auto power off source, only using no power on battery. When measuring 3.42V with a single battery, the EC condition is normal. Press Switch and current of change to enter the EC. The condition of the bridge is also checked. No problem is found. EC, 6259 and BIOS are changed.

Borrowing the board of A1465, all pin of U5110 were measured by battery alone, and it was found that 6 pin was 3.42 V, U5110 6 pin of A1466 was only 0.4V, and VCC was only 0.4 V measured by SMC _ LSOC _ rst _ L.

MacBook A1466 notebook into the water does not open the machine repair Figure 1.

MacBook A1466 notebook into the water does not open the machine repair Figure 2.

There are few places for this signal to go. Only one Capacitor is removed, and it is still the same. I pulled up a 3.42V for him. It is useless to measure this signal again. The 3.42V was actually pulled down to only 0.3V, and it was determined that it was PCB layer short-circuit current here. After cutting the 6 pin of U5110 and the 18 pin of the touch interface, another line flew, and the fault was solved.