A faulty logic board is one of the most common hardware issues that can plague MacBook users. The logic board controls nearly all of the components in a MacBook, so when it experiences problems, it can lead to a variety of frustrating symptoms. Luckily, there are some tried and true methods you can use to diagnose logic board failure on a MacBook. This guide will walk you through the major signs of logic board failure, steps to diagnose the issue, and your repair options if the logic board does turn out to be faulty.
Signs Your MacBook Logic Board May Be Failing
Some of the most common symptoms of a failing MacBook logic board include:
- Computer not turning on at all
- No video/black screen on startup
- Blinking question mark folder on startup
- Distorted or scrambled video
- Issues with battery and charging
- Fan constantly running at high speed
- Overheating issues
- Unusual behaviors like freezes, crashes, random restarts
- Multiple components failing at the same time
- Corrupted software and firmware
- Ports and accessories no longer working
If you notice any of these problems, there’s a good chance the logic board is experiencing malfunctions. The logic board controls many components, so when it starts having issues, it can create all kinds of system problems.
How to Diagnose a Failing Logic Board
If you suspect your MacBook has a faulty logic board, there are a few key steps you can take to confirm the issue:
1. Check SMC and PRAM
Before assuming the worst, first try resetting the SMC and PRAM. These resets can clear minor glitches that may be causing system problems:
- SMC reset – Power down, press left Shift + Control + Option keys and the power button simultaneously. Release all keys at once. Power up Mac.
- PRAM reset – Power down, press Command + Option + P + R keys simultaneously until you hear the startup chime a second time. Release keys.
Then try powering up the MacBook normally. If the issues persist, it’s likely a hardware problem.
2. Check the crash logs
The system logfiles record all hardware and software activities on a MacBook. Checking the crash logs can give you clues about what’s failing. To view logs:
- Open Console app in Applications > Utilities
- In the sidebar, select “Crash Reports”
- Look for crash reports around the timestamps of observed issues
- Major crashes and hardware issues will be flagged here
Frequent logic board-related crashes indicate a failing component.
3. Run Apple Diagnostics
All Intel-based MacBooks have a built-in suite of diagnostics tools called Apple Diagnostics. To use:
- Fully shut down the Mac
- Power up while holding the D key
- This loads Apple Diagnostics from a hidden partition
- The diagnostics will run automatically, checking all hardware
- Errors point to faulty components, including logic board
If the diagnostics detect an issue related to the logic board, there is almost certainly a hardware malfunction.
4. Try a known-good logic board
The most definitive way to test for a bad logic board is to swap in a known good logic board and see if the problems persist. If the known good board resolves the issues, then the original board must be faulty.
You can take the MacBook to an Apple Store or repair shop and have them test with another logic board. Or buy a used logic board in working order and test it yourself. Just make sure the replacement matches the correct model/specs.
Repair Options for a Faulty Logic Board
Once you’ve determined the logic board is causing the problems on your MacBook, you have a few options to get it repaired:
Apple Repair
Taking the MacBook to Apple or an Apple Authorized Service Provider is the most reliable repair option. Apple techs have the training, experience, and access to original Apple parts for logic board repairs. However, Apple repairs also tend to be the most expensive choice.
Out-of-warranty pricing for Apple logic board repairs is usually $500-800 or more, depending on the model. You can call Apple Support to get an exact quote.
Third-Party Repair
Using an experienced third-party repair shop can save you money over the Apple Store. Reputable repair shops employ experienced techs and can source high-quality replacement logic boards. Shop around to get quotes, and look for a shop with proven experience, good reviews, and warranties on work done.
Third-party logic board repairs typically cost $250-500 on average, but prices vary shop-to-shop.
DIY Repair
With the right technical skill, you may choose to replace the logic board yourself. The process involves:
- Buying a replacement logic board
- Watching online repair guides
- Taking apart the MacBook
- Swapping in the new board
- Reassembling the system
This is an advanced repair, but can be cost-effective if you’re comfortable doing your own electronics work. Used/refurbished logic boards can be purchased online for $150-300 typically.
Cost Comparison Table
| Repair Type | Avg. Cost | Process |
|---|---|---|
| Apple Repair | $500-$800+ | Take to Apple Store or Apple Authorized Service Provider |
| Third-Party Repair Shop | $250-$500 | Research and visit reputable local repair shop |
| DIY Repair | $150-$300 | Purchase replacement logic board online. Self-install. |
Conclusion
Troubleshooting a faulty MacBook logic board can be tedious, but is worthwhile to maximize the life of your machine. If you are observant and methodical in diagnosing the issue, you can determine if the logic board is malfunctioning. From there, you have options to repair through Apple, third-parties, or DIY – with tradeoffs in cost, convenience and reliability. With some diligence and patience, even a severely glitched MacBook can be revived with a logic board replacement or repair.