(The normal value should be around 3.3V)Īccording to the circuit diagram, Voltage of PP3V3_S5_REG is outputted by U7501 DC-DC power converter. continue to locate L7560 of PP3V3_S5_REG on the bitmap, run voltage measurement of L7560, the measured value is 0.637V, which is abnormal. Then run voltage measurement of L7130, the measured value is 8.5V, which is normal. Check the DDR RAM and CPU frequency from the label, roll out the circuit diagram and bitmap. Next, detach the logic board and I/O Board from the enclosure, and connect the I/O Board to the logic board. Remove the SSD and WiFi module, confirm the board number of the logic board. then remove the lower case and disconnect the battery. which indicates that the MacBook features not charging and not turning on issue.įirst, confirm the serial number on the lower case. Then plug in the power source and press power button, it current displays as 0.013A-0.016A. Press power button, the MacBook won’t turn on.
#Macbook logic board replacement serial number how to
Now, following to see how to troubleshoot MacBook won't power on issue.
REWA never lets you down and always has an EFI chip solution for MacBook unlock repair for you. Actually, you can find the problem directly based on experience if you are an old hand. The fault is finally confirmed as to be caused by fuse damage due to short-circuited capacitor on the main power supply circuit. For our MacBook Air won't turn on repair case today, in order to demonstrate a complete repair process, we started from main power supply inductor in this video. For repair technicians, their repair work usually goes differently, since the problem can be fixed and solutions may be flexible.
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