My Device shut it down, then less than an hour later went to turn it on ,the machine in question is identified as the MacBook Pro A2159, which is the Touch Bar variant.
it bears a strong resemblance to the non-Touch Bar version, featuring two USB-C ports on either side. However, the screens are not interchangeable, though they can be used for testing purposes. The trackpads between the two versions are interchangeable, allowing for easy replacement. Additionally, the batteries are also interchangeable, making repairs more convenient.
One major difference between these models is the charging ports. In this version, the charging ports are removable, whereas in the non-Touch Bar version, they are soldered directly to the board.
Table of Contents
Repair and Diagnosis Process
This particular MacBook Pro A2159 was brought in due to a no-power issue, and the repair needed to be completed on the same day as the owner was catching a flight the following day. Before applying power to the device, it was essential to first assess its condition to avoid causing further damage.
The device had previously been examined by another repair company, but the original screen assembly had been replaced at some point. While this would not typically affect the power issue, it was worth noting.
initial inspection, there were no signs of liquid damage. The primary issue with this model often stems from the U7710 chip, which has two instances on the board, as well as the U8110 chip. These are among the most common failure points. In many cases, these failures result in a short on the 5V line, necessitating the removal and replacement of the U7710 and possibly the U8110.
However, there are instances where removing the faulty chips clears the short but does not restore functionality. In such cases, a more severe issue involving the CPU may be the cause, which is significantly more challenging to resolve.
To avoid potential CPU damage, the battery cable was disconnected before making initial voltage measurements. The PPBUS voltage levels were checked first. The measurements showed no short on the SSD line and confirmed that there were no immediate red flags.
Removing the Board for Further Analysis
To proceed with caution, the board was removed before applying power. This would prevent unnecessary damage in case the U7710 chip was indeed the root cause of the issue. The two common failure chips were visually inspected, and no immediate shorts were detected on the 5V line.
Further inspection of the board revealed no obvious signs of damage, so power was applied to assess the voltage levels. The PPBUS voltage initially measured 0.8V, suggesting an issue with power delivery. Additional measurements showed 5V on PPDCIN, 20V on the charging input, and 12.3V on PPBUS, which was lower than expected.
One USB-C port was unresponsive, suggesting an issue with the CD3217 controller, which manages USB-C power negotiation and data transfer. Testing the corresponding fuses confirmed that power was reaching the board, but one of the controllers was not responding.
Identifying the Faulty Component
Using board view software, it was determined which CD3217 controller was associated with the failing port. The faulty chip was removed and replaced with a new one. The replacement process required precision to ensure proper alignment and soldering, as misalignment could lead to shorts or improper functionality.
Once the new CD3217 controller was installed, voltage readings were taken again. The PPBUS voltage was now 12.6V, which was a sign that the machine was beginning to transition into an S5 state. Additional checks showed that the SSD 2.5V rail was now present, further confirming progress.
Final Testing and Conclusion
After replacing the CD3217 controller, the machine successfully powered on. All voltage rails were checked and confirmed to be within normal operating ranges. The Touch Bar, keyboard, and trackpad were also tested to ensure full functionality.
This case highlights the importance of systematic diagnostics in MacBook Pro A2159 repairs. While the issue initially seemed complex, breaking it down into smaller steps allowed for a precise and efficient repair. The owner was able to retrieve their device in working condition before their scheduled departure, demonstrating the effectiveness of a thorough diagnostic and repair process.
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