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MacBook A1286 notebook without charging repair
Machine model: MacBook A1286
Plate No.: 820-2519-b
Fault phenomenon: notebook does not charge
Maintenance process: there is no standby current connected to DC power supply. It is found that Fuse resistance of charging chip 2 pin dcin has deteriorated.
MacBook A1286 notebook without charging repair Figure 1.
When the standby current was changed, it was found that the battery was not charged and the interface light was not on when it was taken to the peer.Check the charging chip conditions are normal, also changed two or three chips are not OK, sys_The signal of onewire also has 3.4V, which is suspected to be the problem of EC. We ordered the whole Parts motherboard to charge the chip, and the EC changed it again, and the sound was still the same.
MacBook A1286 notebook without charging repair Figure 2.
Inadvertently connected to the transistor resistance diode value has a few m, think here will not use such a large resistance.
MacBook A1286 notebook without charging repair Figure 3.
Replace it with Parts motherboard.
MacBook A1286 notebook without charging repair Figure 4.
It took a few seconds for DC power supply to light up.
MacBook A1286 notebook without charging repair Figure 5.
The installation test can be charged. The maintenance is over.
MacBook A1286 notebook without charging repair Figure 6.
