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Category Blog

Huawei Mate 30 Pro can’t connect to WiFi repair

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WiFi chip has been repaired at home. The power supply of the WiFi chip is normal when it is turned on, so the iron case of the crystal oscillator is directly found. After disassembling it, the crystal oscillator is taken down to measure the ground value of the crystal oscillator, and it is found that the two ground wires of the crystal oscillator are dropped. Find a good 38.4MHz crystal oscillator and put the motherboard back inside the phone.

IPhone 12 Pro Max can’t start the machine for repair

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Connect the mainboard with the power supply for repairing the machine, and the mainboard is very hot, indicating that the mainboard has a short circuit. This situation is generally caused by the breakdown of the filter capacitor, and the lower board is smoked with rosin, and then the power supply of the lower board repair machine is burned separately to lock the fault point.

Apple A1466 notebook does not start for repair

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Carry out mainboard test and maintenance, connect the power supply to test the power supply, and check according to the time sequence; It can be roughly judged that the problem should appear on the bridge side. It is found that the bridge does not emit PM_SLP_SUS_L, and it is abnormal to test 0V at the resistor R8190.

Red rice Note 9 Pro can’t be charged for repair

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Disassemble the back shell of the mobile phone, plug in the data cable and use a multimeter to measure that the tail plug cable at the motherboard end has a 5V voltage input, indicating that the non-charging fault has nothing to do with the tail plug small board and the cable, and it can be determined that there is something wrong with the motherboard.