So Q1920 has failed.Īfter replacing Q1920, we have a happy, working MacBook now. Check power supply to Q1920: PP PP5V_S0 1V5_S0SW_AUDIO_HDA and PP5V_S0 are both excellent.Management Engine has been disabled, result in the Mac is running very slow. Management Engine is enabled again when OS boots normally. So a full re-flashing of SPI ROM can be done. Then pin 4 outputs HDA_SDOUT_R (high) to disable ME module in the CPU. When a user performs the firmware upgrade, SMC sends out SPI_DESCRIPTOR_OVERRIDE_L to chip Q1920 pin 2. The fault turned up to be a faulty transistor Q1920 disabled ME module in the CPU.Īccording to Intel CPU design, CPU/PCH uses audio module HDA_SDO signal as a power-up strap to enable or disable the Management Engine shown as follow: CPU ME module failure – not economically repairable.Intel Management Engine codes in SPI ROM corrupted.Intel Management Engine (ME) in the CPU not enabled.This cross-checking confirms that the logic board is faulty, but not “stop” booting, just extremely slow.Īnalysis: Any of the following faults could cause a MacBook to run very slow: Then we put customer’s SSD drive in our test machine, and it boots with no problems. We replace the SSD drive with our known good one and get the same result. MacBook Model Number A1466 Year 2015 and Logic Board Number 820-00165.ĭiagnosis: The MacBook can boot into ASD but not into OS. A report from an Apple Authorized Service Provider has suggested replacing the logic board. Not sure if you’re covered? Check your coverage by entering your Macbook serial number.Background: The MacBook is very clean, no water no physical damage. There’s no charge if your Macbook issue is covered under warranty, AppleCare+, or consumer law. To get service for your MacBook, you can call us or make a reservation online.

Visit us to make sure you get your product back working the way it should. Genuine Apple Parts are critical to a quality repair. All of our technicians receive Apple training and they deliver the same high-quality service with genuine Apple parts and the proper tools, which provided and recommended by Apple, to open and close the device therefor the repairs are backed by Apple. TopTek System (TTS) is an Apple Authorized Service Provider. Newest compatible operating system: OS X El Capitan 10.11.6

Model number a1466