How to MacBook Pro A2141 No Power Issue

The MacBook Pro A2141 is one of the latest MacBook models, and like all advanced devices, it sometimes encounters hardware failures. One of the most common issues found in these models is the “No Power” problem. In this guide, we will walk through the process of diagnosing and repairing this issue by carefully analyzing the motherboard and checking for faults.

Step 1: Initial Diagnosis

To begin, we need to connect our DC power supply and observe the impedance readings:

• When the DC boot cable is connected, the circuit takes in an initial 5V, which then converts to 20V.
• The device consumes approximately 0.06757A (or 0.560A).
• Despite the power draw, the MacBook does not fully power on.
• Instead, it cycles on and off continuously with no fan spin, and the motherboard experiences mild heating.
• This behavior suggests a potential short circuit or power rail issue on the logic board.

Step 2: Inspecting the Logic Board

With the symptoms indicating a potential short circuit, we now proceed to inspect the logic board:

• The MacBook Pro A2141 motherboard part number is 0170-A0820.
• A close examination of the board reveals two main power coils labeled L9580 and L9581.
• These coils, responsible for 2.5V power supply, appear to be shorted to the ground.
• Using a multimeter, we check the resistance of the coils and confirm that they are indeed grounded.
• The PP 2.5V NAND rail, which supplies power to the storage system, is affected by this short.

Step 3: Identifying the Faulty Component

• The coils are connected to an IC labeled U9500 (TPS6210), which is a power management chip.
• The IC is visibly damaged, with signs of overheating and potential burn marks.
• When power is applied, the IC heats up excessively, further confirming that it is faulty.
• We remove the suspect coils and measure the impedance once again.
• The short is still present on one side of the circuit, pointing directly to the U9580 IC as the culprit.

Step 4: Replacing the Faulty IC

• Since the issue originates from U9580 (TPS6210 VGA Power IC), we prepare to replace it.
• Carefully desoldering the IC, we clean the pads to ensure a proper connection for the new chip.
• A new TPS6210 IC is ordered and soldered onto the motherboard.
• After replacing the IC, we recheck the impedance and confirm that the short circuit is no longer present.

Step 5: Reassembling and Testing

• The board is now reassembled, ensuring all components are securely in place.
• Connecting the DC power supply, the MacBook now successfully converts 5V to 20V.
• The device powers on, and the display comes back to life, confirming that the repair was successful.
• Final temperature checks show that there is no longer excessive heating on the board.

Conclusion

The “No Power” issue on the MacBook Pro A2141 was caused by a faulty TPS6210 VGA Power IC (U9580), which led to a short on the PP 2.5V NAND rail. By diagnosing the issue step by step and replacing the defective IC, we successfully restored functionality to the MacBook.

This process demonstrates the importance of precise diagnostics, power rail analysis, and component-level repair skills when dealing with MacBook Pro A2141 logic board failures.

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