2018 MBP No Power
No Power
Unlikely causes:
Bottom case, display assembly, eDP flex cable, fans, keyboard flex cable, audio board, vent/antenna module.
Quick Check
| Symptoms | Quick Check |
|---|---|
| Computer does not turn on No image on display and no Caps Lock light when key is pressed | computer, and reenable Auto Boot after the computer has been reassembled and service is completed. Follow steps in TP1484: Auto Boot to enable or disable this function. After logic board replacement, if the computer does not 1. turn on, this could mean that the replacement logic board has not yet been configured for use. For complete instructions to configure a replacement logic board, refer to TP1657: System Configuration for MacBook Pro (2018). Always complete all applicable procedures and diagnostic suites after part replacement, to ensure that the new part operates properly with the rest of the system. Failure to do so may result in an inoperative system and an incomplete repair. Verify that you are using a functional power outlet. 2. Verify that the user's power adapter and charging cable 3. are the correct models for the user's computer. Refer to HT201700: Find the right power adapter and cable for your Mac notebook. Different power adapters and USB- C charging cables may appear similar but may not provide sufficient power to turn on or charge the computer. Check for damage or debris in the USB-C connectors on 4. the computer and the power adapter. Inspect the power adapter, connectors, AC wall adapter, 5. and charging cable for damage such as bent plug pins, frayed or exposed wiring, or burn marks. Test with a known-good electrical outlet, power source, 6. power adapter, and charging cable that is the correct type for the user's computer. Connect the power adapter to each USB-C connector on 7. the computer and retest each time to isolate a possible |
| Note: Inform the user that computer failures due to accidental damage are not covered. If applicable, discuss out-of- warranty repair options. Refer to OP14: Determining and quoting accidental damage for Mac portables. | faulty USB-C port on the user's computer. Disconnect all peripherals. 8. Determine whether the computer has power by 9. confirming that any of the following function correctly: Trackpad clicks when pressed Power connection feedback occurs Caps Lock key light turns on when pressed Display activity functions Keyboard backlight turns on with ambient light change or when the sensor is covered up An external display functions Verify that Auto Boot is enabled. If Auto Boot is 10. |
| disabled then the computer will not automatically turn on when the power adapter is connected as expected. Refer to TP1484: Auto Boot for instructions. Follow suggested steps in HT204267: If your Mac won't 11. turn on. Reset the SMC using the procedure for this computer in 12. HT201295: Reset the System Management Controller (SMC) on your Mac, then try to turn on the computer. Refer to the following articles to learn more information 13. about power-related features and functions specific to this computer that may be misinterpreted as service issues: HT207097: Charge your MacBook Pro with Thunderbolt 3 HT207104: Start up your MacBook Pro or MacBook by opening it or plugging it in HT204652: If your USB-C power adapter isn't charging your Mac notebook HT204700: Battery may not charge or drains while using AC power |
Table Caption: This table outlines symptoms of a computer not turning on with no display or Caps Lock light, and provides a "Quick Check" section with numbered steps to troubleshoot the issue, including verifying power sources, adapters, connections, and system settings.
Deep Dive
| Result | Action | Code | Commodity | ||
|---|---|---|---|---|---|
| 1. | Check Connect the user's computer to the user's power adapter and charging cable that is connected to a known-good electrical outlet. The computer should turn on automatically if it is off when the power adapter is connected. Check for any signs of power, such as Caps Lock | Yes No | Go to step 2. Go to step 4. | ${nodeText.yesSymptomCode} ${nodeText.noSymptomCode} | |
| 2. | signs of power activity? Check for a video signal on the built-in display. | Yes | Run Mac Resource Inspector (MRI) to obtain the latest test results. Verify resolution. | ${nodeText.yesSymptomCode} | |
| Is a video image clearly visible on the built-in display? | No | Go to step 3. | ${nodeText.noSymptomCode} | ||
| Use a flashlight at a steep angle to the display to check for video output without the backlight. | Yes | Go to the 'Backlight Issue / No Backlight' troubleshooting flow. | ${nodeText.yesSymptomCode} | ||
| 3. | Is any video visible with the flashlight? | No | Go to the 'Power But Blank/No Video' troubleshooting flow. | ${nodeText.noSymptomCode} | |
| 4. | Inspect the user's power adapter and AC wall adapter for damage. Check the USB-C ports on the user's power adapter and computer for contamination, debris, or damaged pins. Inspect the user's USB-C charging cable and connectors for damage. | Yes | Go to the 'Mechanical/Physical/Cosmetic Damage' troubleshooting flow. | ${nodeText.yesSymptomCode} |
Table Caption: This table outlines a troubleshooting process for a computer that is not powering on, guiding the user through checks of power connectivity, display output, and physical component integrity.
Table Caption: This table outlines a troubleshooting process for a computer that is not turning on, focusing on power-related issues and potential damage to USB-C ports and the top case.
Table Caption: This table outlines troubleshooting steps for computer startup issues, indicating checks, expected results, and corresponding actions and part replacements with associated codes and commodity types.
| Check | Result | Action | Code | Commodity | |
|---|---|---|---|---|---|
| 12. | Verify that the computer can now complete the startup process over multiple trials. Run any applicable diagnostics to verify that no | Yes | The issue is resolved. | ${nodeText.yesSymptomCode} |
**Table Caption: This table documents the results of a verification step, indicating that a computer has
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