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#FIX MAC PRO POWER SUPPLY INSTALL#
#FIX MAC PRO POWER SUPPLY DRIVER#

But problems with the SMC can also occasionally affect system performance. If any of these functions are behaving oddly, resetting the SMC could solve it.

Selecting an external (instead of internal) video source for some iMac displays.

Status indicator light (SIL) management.

Responding to the display lid opening and closing on Mac notebooks.

Responding to presses of the power button.

Here’s a complete list of what the SMC does, straight from the Apple website : For example: when you plug in the power supply for your Mac laptop, the lights on the charger work even if your Mac is completely shut down. Some functionality of your Mac works regardless of whether it’s turned on. Mac desktops, meanwhile, basically just need to be unplugged. Any Mac laptop made since 2009 doesn’t have a removable battery, meaning you’ll need a keyboard shortcut to get the job done. Watch the video below to see how we fix a MacBook Pro that won't turn on by restoring T2 chip data.The exact method for doing this varies depending on your Mac. For more MacBook repair content, please visit our MacBook Repair Guide channel. After rewriting the ROM data of T2 chip, the MacBook could turn on and enter the system. To determine whether the fault was caused by data problems, BY-T200 Data Assistant was used to read and write the data of T2 chip ROM. The voltage values related to the boot circuit on the motherboard were found to be normal after measuring. In the first place, we used MacBook BY-3200 power cable to observe the change of boot voltage and current. The MacBook is turned on and can enter the system. Plug in the power cable and press the power button. Connect the battery flex cable and put the back cover on.

#FIX MAC PRO POWER SUPPLY INSTALL#

The current jump on the DC power supply is normal, which indicates that the motherboard is turned on.ĭisconnect the power cable and install the motherboard. The BY-3200 shows an increase in input voltage from 5V to 20V.

#FIX MAC PRO POWER SUPPLY DRIVER#

Install the driver and open AsProgrammer.Ĭlick Read ID and select MX25U3235F_1.8V.Ĭlick Open file and select A1989 T2 ROM original data.bin. Pin 1 of the chip must align with the red dot on the tool. Get the BY-T200 and write the new SoC ROM data. Remove SoC ROM chip with Hot Air Gun at 430℃. Find U4770 on bitmap.įind SoC ROM (U4770) on the motherboard. Find SoC ROM and the location name is U4770. Search U3900 on the diagram and find the ROM chip for T2.Ĭopy signal SPI_SOCROM_MISO. Find T2 chip on the bitmap and the location name is U3900. Next, we need to decide if the fault (voltage failing to increase) is caused by T2 chip data problems. It can be judged that the power supply circuit of the motherboard is good. Measure the power supply of the motherboard. The motherboard current stops at 0.06A and the input voltage is only 5V. This table shows the standby voltage of T2 chip.

Measure the standby voltage of the T2 chip, which is supplied by the U7800. Then we remove the motherboard and install the power connector flex cable. It indicates that the motherboard has malfunctioned. The power supply of the motherboard is only 5V, which is abnormal. The current reading on the DC Power Supply stays at 0.059A.

Plug in the BY-3200 and the input voltage is 5V. Remove the screws and disconnect the battery connector flex cable. Next, we need to disassemble the MacBook and test. The current reading on the DC Power Supply stays at 0.047A. Plug in the BY-3200 power cable and the input voltage is 20V. Today we will share a case about repairing a MacBook Pro 13"2018 (A1989) that won’t turn on.