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Today we received a MacBook Pro A2289 motherboard. The customer notes it wont turn on. First of all, run a cosmetic inspection of the motherboard. The motherboard is not water damaged or deformed. Next, we check the motherboard start-up current. Connect the motherboard to the cable. Connect to direct current supply and prompt a boot-up. Boot-up current is abnormal. Turn on the diode mode of the multimeter. The red probe is grounded and the black probe measures several sets of diode values for the main power supply lines of the motherboard. When the L7670 inductor is measured, the diode value is 6. The normal value should be above 300. Judging by this, the line PP5V-G3S is faulty. Next, the line needs to be powered up to do further testing. First, solder a cable next to the L7670 inductor. Set the DC power supply voltage to 3V. Connecting the motherboard with alligator clips. Mind the positive and negative pole positions. The thermal imager method can quickly and accurately find the fa