MacBook Air A1466 switch auto power off repair

Apple MacBook Air A1466 Notebook switch auto power off repair

Machine model: apple MacBook Air A1466

Motherboard model: 820-00165

Fault symptom: notebook switch auto power off

Maintenance process:

Macbook A1466 notebook, when the fault phenomenon is turned on,auto power off, and the current is about 0.2 or so. When the motherboard is removed, it is found to be Previously repaired, and there are traces of Flux and repairs on the motherboard in many places.

Apple MacBook Air A1466 Notebook switch auto power off repair Figure 3.

auto power off when the bare board is powered on, excluding the possibility of auto power off caused by peripherals. The maintenance directions are as follows:

BIOS failure, 2. The motherboard has Short circuit,3. The timing problem, 4. The VCC,5. The temperature control signal is missing, 6. It can’t afford the load, etc. The BIOS chip has been repaired at home. Measuring several VCC oscilloscopes, CPU 1.7V, memory 1.3V, bridge 1.05V, PP1V8_S3, PP5V_S4, etc., all maintained for about 500 milliseconds at the moment of power-on, and then dropped at the same time.