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Today we will share a case about repairing a MacBook that wonamp;#39;t turn on Press the power button The MacBook wonamp;#39;t turn on Plug in the BY-3200 power cable and the input voltage is 20V The current reading on the DC Power Supply stays at 0.047A Unplug the power cable Next, we need to disassemble the MacBook and test The MacBook model is A1989 Remove the screws Disconnect the battery connector flex cable Plug in the BY-3200 and the input voltage is 5V The current reading on the DC Power Supply stays at 0.059A The power supply of the motherboard is only 5V, which is abnormal The normal power supply should be 20V It indicates that the motherboard has malfunctioned Then we remove the motherboard the power connector flex cable The motherboard number is 820-00850-07 Open the schematic diagram and bitmap U3900 is the T2 chip U7800 is the power chip Measure the standby voltage of the T2 chip, which is supplied by the U7800 Find U7800 on the schematic diagram This table shows the st