Repair For MacBook Pro A1989 That Won't Turn On

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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.

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Repair For MacBook Pro A1989 That Won't Turn On

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