Here are some of the common issues you can face if you have a logic board malfunction on your Macbook.
Power issues and unexpected shutdowns
Since logic boards are the brains of the computer and regulate almost every aspect of its working, one sign of a logic board malfunction is the computer not turning on at all when you press the power button. If your computer does not show any signs of turning on after it has been fully charged, there might be an issue with the power regulation in your laptop, something that cannot be fixed with software manipulation.
Display problems
The display is also controlled to a large extent by the logic board of the computer. Hence, if you see that the display has a backlight on but does not display anything other than a blue or black screen with an apple logo or a question mark, the logic board might not be working correctly. More apparently, if you have hazy lines or scrambled edges on your screen while working, this might also be a logic board issue.
Component failures
When the logic board of a Macbook is failing, it might refuse to recognize any new devices that are plugged into the laptop, like an external display or even an accessory like a wireless mouse. You may also notice that the computer does not provide enough power to the device to run through its docks even when you plug the computer into a power source. Bluetooth might also suffer due to a logic board malfunction.