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IPhone 12Pro Max phone has no baseband repair

IMG_257
Separate the motherboard, check the solder joints of the motherboard to see if there are obvious virtual solder joints, and then measure the solder joints from the motherboard to the upper layer. It is found that the main board has obvious solder joints falling off. After the solder joint is repaired, the measured resistance is normal. Re-attach the upper and lower layers, and repair the fault.

Repair of HP G6 notebook without startup

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Lay down the chip value and find that several pin values are abnormal. Measuring the upper and lower tubes shows that the extreme values of G and S of the upper tube are 50. Replace the chip and the upper tube. Power-on standby is normal again, 0.014A triggers 0.073A is normal, the machine is powered on, the machine is turned on perfectly, the fault is eliminated, and the maintenance is over