

All spare parts can be obtained from supply sources except one: Logic board. If there are no spare parts then there is no fix. This part-replacing type of repair is entirely dependent on the availability of the spare parts. Any malfunction will require the next level of repair.ħ. If the logic board can be powered up, we test all its expected functions to see if there are any remaining defects that can be found. If the logic board can be powered up manually, we re-connect cables one by one to determine which one is preventing the logic board from powering up.ĥ. If there is still no change of current, that is evidence that the logic board is faulty and a higher level of repair work is needed.Ĥ. If there is no change, we remove the keyboard cable and any other cables from the logic board and perform a “forced" power-on to the logic board. Press the power button to see if there are any changes in the current. If an over-current is found we cut off power immediately to prevent further damage the MacBook (as this finding indicates the logic board has highly likely shorted circuit).ģ.

Connect a special power unit with a digital display showing the electric current being drawn from the power supply to the MacBook. We never power up a liquid-damaged MacBook without proper treatment since it may result in more chips damage and make the repair work much harder.Ģ. We open the bottom panel and conduct a visual inspection to determine if it is safe to power up.
