Apple MacBook Pro A2338 notebook can be repaired when it enters water

UP700 1-pin power supply is normal, 2-pin power supply is normal, 5-pin power supply is not output, and the measurement is not short-circuited. Connect it directly. Start the test, the screen display is normal, troubleshooting, and maintenance is over.

Machine model: apple MacBook Pro A2338 notebook

Board number: 820-02020

Fault phenomenon: the notebook does not boot when it is flooded.

Maintenance process:

An Apple MacBook Pro A2338 notebook, with a large area of water, can be poured out after disassembling the machine, and does not boost the voltage after the measurement is plugged in.

Apple MacBook Pro A2338 notebook enters the water and does not start up for maintenance Figure 1

U5700 6-pin short circuit, burning machine found that the Type-c chip in the upper left corner was hot, and there was a short circuit when it was removed. U5700 3.8V chip was also broken.

After the replacement test, the boot sound is normal, and the screen is not displayed. Look carefully at the dark screen and find the definition of screen line interface.

Apple MacBook Pro A2338 notebook enters the water and does not start up for maintenance Figure 2

PPVOUT_LCDBKLT is not boosted by 0V, the screen power supply PP3V3_SW_LCD_CONN 3V is normal, and PP5V_SW_LCD_CONN 0V is abnormal.

Repair the 5V power supply first.

Apple MacBook Pro A2338 notebook enters the water and does not start up for maintenance Figure 3

UP700 1-pin power supply is normal, 2-pin power supply is normal, 5-pin power supply is not output, and the measurement is not short-circuited. Connect it directly.