What Is a Logic Board?

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  • Written By: Mary McMahon
  • Edited By: Shereen Skola
  • Last Modified Date: 14 January 2019
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A logic board is the core of an Apple computer, akin to the motherboard used in PCs and other systems. This circuit board houses a number of key system components along with ports to connect to other parts of the computer, enable connectivity, and expand functionality for the device. Some may last the life of the device, while in other cases the logic board may need to be replaced as a result of damage or spontaneous failure. A technician's services may be necessary for the replacement procedure, depending on the system and the user's comfort level with technical repairs.

The computer's microprocessor is seated on the logic board, along with memory and other components. A number of ports provide opportunities to connect other devices in a custom configuration to suit the needs of the user. These can include additional external storage, drives, and so forth. Logic boards act like the brain of the computer, housing all the important tools to make the system work and the connections to enable a variety of uses.


In the manufacturing process, logic boards are printed with circuitry and components can be soldered on or seated in ports built into the board. A quality control technician checks to make sure the manufacture is within normal tolerances. If it passes the testing, it can be inserted into a computer system, or packaged separately for shipment to a repair or parts center. Logic boards must be handled carefully, as they are susceptible to static and damage that could ruin them or cause errors in the system.

When computers exhibit errors and signs of failure, there are a number of diagnostic tests technicians can use to explore the possible causes. These can include tests of the logic board if it appears to be a possible culprit. Testing can provide information about how signals move through the board, and where errors appear to originate. If the logic board is the problem, the technician can replace it.

Computer users should be aware that warranties may cover such replacements within a set period of time, although there may be some restrictions in the warranty terms. Manufacturers may require that people use their in-house replacement services to quality for warranty coverage, and may void the coverage if there's evidence the user tampered with the system or behaved negligently. Users with questions about such coverage can contact the warranty program for specific guidance to determine if they are eligible.


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