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How To Repair 13 Macbook Pro A1989 That Won’T Turn On

MacBook Pro A1989 Won’t Turn On? Here’s a Step-by-Step Repair Guide

Is your MacBook Pro A1989 refusing to turn on? Don’t worry, we’ve got you covered At Salvation Repair, we offer a limited lifetime guarantee on all parts and labor, and our expert technicians are here to guide you through the repair process. In this tutorial, we’ll walk you through the steps to diagnose and fix the issue.

MacBook Pro A1989 won't turn on

Step 1: Check the Power Button and Power Cable

First, ensure that the power button is functioning correctly. Press the power button and check if the MacBook turns on. If it doesn’t, try plugging in the power cable and check the input voltage using a DC Power Supply. In this case, the input voltage is 20V, but the current reading stays at 0.047A.

DC Power Supply reading

Step 2: Disassemble the MacBook and Test the Motherboard

Next, we need to disassemble the MacBook and test the motherboard. Remove the screws and disconnect the battery connector flex cable. Plug in the BY-3200 power cable and set the input voltage to 5V. The current reading on the DC Power Supply stays at 0.059A, indicating that the motherboard is malfunctioning.

Motherboard testing

Step 3: Identify the Faulty Component

After testing the motherboard, we need to identify the faulty component. The motherboard number is 820-00850-07. Open the schematic diagram and bitmap to locate the T2 chip (U3900) and the power chip (U7800). Measure the standby voltage of the T2 chip, which is supplied by the U7800.

T2 chip and power chip location

Step 4: Replace the SoC ROM Chip

After identifying the faulty component, we need to replace the SoC ROM chip. Remove the SoC ROM chip with a Hot Air Gun at 430℃. Get the BY-T200 and write the new SoC ROM data. Attach the chip to the seat of BY-T200, ensuring that Pin 1 of the chip aligns with the red dot on the tool.

SoC ROM chip replacement

Step 5: Reassemble the MacBook and Test

After replacing the SoC ROM chip, reassemble the MacBook and test it. Plug in the power cable and press the power button. The MacBook should turn on and enter the system. If the issue persists, contact Salvation Repair for further assistance.

MacBook Pro A1989 turned on

At Salvation Repair, we offer a limited lifetime guarantee on all parts and labor. If you’re experiencing issues with your MacBook Pro A1989, schedule a repair with us today Schedule a repair

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