MacBook has become an indispensable tool in our daily life and work, and it is very convenient for office, study and entertainment. But sometimes you may encounter some headaches, such as the computer suddenly cannot be turned on, the power button does not respond, the screen is black, etc. Don't panic at this time, the problem may not be serious. Next, let's follow China Phonefix to see how to deal with it.
According to the owner, the MacBook suddenly shut down without any warning during use, and could not be turned on again. After trying many methods without success, he finally had to send it to a professional repairman. So what happened to this MacBook that suddenly "fell asleep"? Next, let's follow the repairman's steps to uncover the cause of the failure and see how to "wake it up" step by step.
The repairman first tried to press and hold the power button, change the charging cable, and use the combination key to force restart, but failed to wake up the MacBook. He judged that it might be an internal hardware failure and began to disassemble it. He placed the device on an anti-static workbench, laid a mat, put on an anti-static wristband to ground it, and took a special screwdriver set to select the corresponding model.
Then, he unscrewed the fixing screws on the bottom edge of the device one by one, and put them into the corresponding grid of the special screw box according to the position. After removing the screws, use a plastic pry bar to gently insert and pry along the gap of the shell to loosen the buckle, paying attention to the strength to prevent breakage.
Disassemble the shell and remove the back cover to expose the battery, motherboard and other components. He first looked at the interface position and fixing method of the battery cable connecting to the motherboard, and then separated the screen cable, button cable, etc. according to the internal structure - first find the lock, pry lightly with tweezers, and then pull out the cable to avoid damage. Finally, unscrew the hidden screws that fix the motherboard, carefully remove the motherboard, and the disassembly is completed to prepare for subsequent testing.
After removing the motherboard, the repairman first checked the rest of the machine: the screen can be lit up when connected to the spare motherboard, the battery is charging normally, and the keyboard signal is normal. After confirming that there is no fault, the focus is turned to the motherboard. When testing the motherboard, the master first visually inspects it. Under strong light, he used a stereo microscope to find water stains near the edge of the USB interface and white residue on the edge.
Using the multimeter conduction file to detect, it was found that the two solder joints around the water stains were abnormally conductive; using an oscilloscope to measure the power point, the voltage waveform was distorted. After comprehensively judging that the circuit in the area was short-circuited, the master marked the faulty part with a red pen, and recorded the abnormal solder joint location and voltage data in the logbook for repair.
After confirming that the circuit in the corresponding area of the motherboard was short-circuited, the maintenance master used a microscope to further check and clearly found that the power management chip named TPS51980s was abnormal. After that, he immediately tested other components on the motherboard. After testing, none of these components had any problems.
In view of this, the master decided to replace the TPS51980s chip. He took out tools and accessories such as a hot air gun, solder paste, tin-absorbing tape and a new chip. He first adjusted the hot air gun to the appropriate temperature and wind speed, heated the chip evenly, and gently moved it with tweezers. After the solder on the chip pins melted, he carefully removed the old chip. Then, he used tin-absorbing tape to clean the residual solder on the chip pad, and then applied an appropriate amount of solder paste. After that, the new TPS51980s chip was accurately aligned on the pad, and heated again with a hot air gun to melt the solder paste, so that the chip pins and the pads were perfectly soldered. After a series of operations, this TPS51980s chip was successfully replaced.
After replacing the chip, the master used a multimeter to test the power supply and signal points of the motherboard, and the results were normal; he then used an oscilloscope to check the relevant waveforms, and there was no abnormality. After that, he reset the motherboard and tightened the fixing screws, and buckled the cables in the reverse order of disassembly. Without covering the back cover, he plugged in the power directly to test whether the screen was lit and the working status of the chip and other components to ensure that the device could run stably.
It turned out that the TPS51980s chip had a problem. After replacing it, the boot process was very smooth. When installing the machine, the repairman also helped the customer clean the appearance, using a soft brush to sweep away the dust in the gaps in the body, and then wiping the stains on the outer shell with an alcohol cotton pad. After all the parts were put back in place and the back cover was installed, the MacBook was completely repaired.
I have to applaud the repairman's superb skills. It was his precise investigation and skillful operation that saved the customer the cost of buying a new machine. If you are also a DIY expert and are good at independently repairing a certain Apple electronic product, diyfixtool would be a good choice to meet your various repair needs.
