In this tutorial, we demonstrated how to troubleshoot and repair a Samsung Galaxy J5 2016 that is not recognized by a computer. We began by disassembling the device, inspecting the motherboard, and using a microscope to closely analyze the charging connector. By measuring the impedance in the connector pins with a tester, we identified an issue with pins number three and four, which showed an open circuit.

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We then inspected the electronic circuit, checking the components and voltages, and found a failure in two resistors. We replaced the faulty resistors by desoldering them with the help of flux, which allowed for an efficient and safe desoldering process. We cleaned the area with a cotton piece and a cleaner, and then soldered the new resistors using a precision air station with a temperature of 350ºC and an air ratio of 50%. This ensured optimal soldering quality and reliability.

After measuring the component again with a multimeter, we confirmed that the line was recovered, and proceeded to clean the area once more. We reassembled the device and concluded the tutorial, emphasizing the importance of following the five measurement principles discussed in previous classes for successful repairs.


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