Samsung Tab A Won't Turn On: How to Fix It!
In this case, we have a Samsung Galaxy Tab A that won't turn on. The disassembly process is not covered in this video, but numerous tutorials can be found on YouTube. The objective is to reach the motherboard, which requires lifting the screen. The method used to lift the shields involves applying 400°C and 80% air for the shortest time possible, which saves significant time during repairs.
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At the 0:50 mark, we find 5 volts on the motherboard. A future class will detail how to perform these measurements in the shortest time possible. Under the microscope, the multimeter in continuity mode is used to search for a short or leak on the motherboard. A faulty capacitor is identified, and a digital precision multimeter from FLUKE is used to display the values on the screen.
The coil is lifted to introduce voltage, and the short circuit is located on the right side. For good soldering, the track is tinned and then the cable is soldered using a thick tip. A Quainli 3D thermal camera is utilized to search for short circuits or leaks, showing the temperature rising to 49 degrees Celsius. While good tools are helpful, a skilled technician can resolve these issues with basic tools, such as the rosin technique. Investing in quality tools can save time, depending on the volume of work.
The faulty component, a power amplifier, is removed using 400°C and 80% air. Applying high heat and considerable air flow saves time and reduces risk to the motherboard. Once the short circuit is gone, the coil is soldered back in place and the device is checked. The repair typically costs around 90 euros, with a potential 10 euro discount for regular customers.
After connecting the charger, the tablet starts charging well. The screen is then connected and the device is turned on. Once the fault is located, the technician simply needs to purchase and replace the integrated circuit. Despite the cracked glass protector, the screen remains functional. This repair demonstrates that with the right skills and tools, any Android device malfunction can be resolved.
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