Apple MacBook a1466 laptop not found Nand repair

Apple MacBook a1466 laptop not found Nand repair

Apple MacBook a1466 notebook can not find Nand, first measure the working conditions of Nand, remove 3.3V, open VCC, find one Parts motherboard, switch on Nand, and no auto power off. Troubleshooting and maintenance are over.

[machine model] Apple MacBook a1466 notebook

[mainboard version] 820-00165-a

[fault phenomenon]Nand cannot be found in notebook

Received an apple MacBook a1466 laptop, the machine brought no power on, unplug the battery can switch, but the notebook can not find Nand, experienced many people repair.
[maintenance process]

Since the notebook can not find Nand, first measure the working conditions of Nand, open Xinzhizao Soft to find Boardview paper.

Apple MacBook a1466 notebook cannot find Nand maintenance Figure 1

No pp3v3 was found_S0SW_SSD Nand VCC found u8070.

Apple MacBook a1466 notebook cannot find Nand maintenance Figure 2

SSD not found_PWR_EN signal, this signal is directly sent by the CPU, it is estimated that this is the basis for the maintenance personnel to determine the CPU failure.But can’t this arbitrary doubt is to go to a certain chip open is pulled low, remove the u8070 check pull-up VCC no problem, had better find a small chip u3711.

Remove 3.3V and open VCC. Find one Parts motherboard and switch on Nand. There is no auto power off. Troubleshooting and maintenance are over.