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The First Mobile Repair Store Delivering Digital Solutions Since 2006


Our Passion: Repairing Mobile Devices
Our Obsession: Making Customers Happy
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happy iPhone repair Toronto customer at TechKnow Space
happy techknowspace Mississauga iPhone Repair customer
Toronto: 416 987 9860 
 Mississauga: 905 897 9860

Logic Board Service Solution Center

A Device Logic Board may also be referred to as a Main Board or Motherboard.

iPhone Internal components

Logic board solutions are generally considered when all other repair options have been exhausted. The logic board, otherwise known as a mainboard or motherboard, is the primary component of any electronic device. It controls and is connected to all the peripheral components, ie. screen, speakers, charging port, battery, jacks, everything. When one or more of the connected components fail we most often replace the problematic components, problem solved. However, if we find the issue persists with replacement parts, this raises a red flag that there may be other underlying issues.

Identifying a solution is of far greater importance than discovering the cause. When a device comes in for repair and its identified that the issue is with the logic board, we normally look at the symptoms to narrow down the source of the problem and determine the solution.

Internal components, or parts we cannot see from the exterior, cannot normally be identified as being a source of an issue without running some diagnostics. For this reason, we cannot be sure that the logic board is in fact causing issues until the device has had an internal diagnostic inspection.

Some common issues with a logic board failures can be suspected through its symptoms, but not 100% confirmed without digging deeper. For example, an iPhone that doesn't respond to touch may have a defective or damaged screen assembly or the issue could be with the integrated circuit component on the logic board that processes the capacitive touch. The latter can sometimes be identified when a foreign grey bar appears at the top of the display screen.

Logic board micro soldering

We repair all logic board issues in-house using the latest in industrial and high-performance tools and equipment. Whether your device logic board requires micro soldering, trace restoration, re-balling or component replacement, we are your resource for getting the job done right.

If your device has been damaged by exposure to liquid , you can be sure that the liquid has managed to get to the logic board. In these cases, the  resulting corrosion will cause damage to the circuits on the logic board and can even inhibit some from working or the device may not work at all. In some cases, the components on the logic board have become damaged and require further repair as a result.

Liquid Damaged Logic Board

Device Logic Board vs Human Brain

The main logic board of all devices is (in many ways) like the human brain.

This is a simple analogy of what happens when human body parts, and device components, fail.

We are only dead, technically, when all brain activity ceases. Our hearts may have stopped beating, or we may have lost limbs due to accidents or other unpleasant situations. As long as the brain has activity, hearts and limbs can be transplanted/replaced, and we can still move forward with our lives.

Once brain activity stops, all transplants or body replacements are futile. We are “dead”.

The main logic board in devices is essentially an electronic iteration of a brain. 

A screen or a power button or any other component in a phone, laptop, gaming console, wearable, etc all send signals or request (technically called “IRQs”) to the brain or the Main Logic Board or MotherBoard. The brain understands the context of the requests and appropriately responds to the signal originating from the component (ie, screen or power button). These components, upon receiving the response from the main logic board, will, in turn, demonstrate a behaviour or create a response, viz. display an image, or power on or off the device, etc.

Replacing a screen or a power button is a successful transplant or replacement so long as the brain (or the logic board in the device) is alive. When the logic board is dead or damaged, parts or component replacement is futile.

Mainboards for all devices (except some desktop computers) are not available to us to purchase as a new part.   For many laptops used mainboards may be available from individual sellers such as, on eBay, but with Tablets and especially smartphones there simply is no way to procure a new replacement mainboard once it fails.  

In smartphones, the mainboard is hard-coded with an IMEI and calibrated as per FCC/CRTC regulations and only the manufacturer of the device can do this.  Thus there is no supply (either new or used) for smartphone (and most tablet) main logic boards).  

When your devices mainboard fails the only way to procure one is to purchase another working device (which obviously makes repairing a smartphone with a failed or failing mainboard cost prohibitive.)   

"But what about my data?" You may ask. "I'll pay any price to replace the mainboard and get my data back!"  Unfortunately, the mainboard in a smartphone is where the data is stored.  So once failed (or failing) data recovery and/or extraction is precluded.  Yes, out of luck. No Data.   

Mainboards failing after damage or after component replacement is rare -- though not unheard of.  

After a device is damaged -- especially physical damage such as a drop, exposure to liquid, or having the frame and in turn the mainboard bent -- it is possible that there is internal damage to the logic board that is not seen until a device is re-assembled or even some time later.  A screen that is replaced on a device that has internal mainboard damage may work well at first but over time, issues can begin to crop up such as lines showing up, screen going black, device overheating, experiencing charging problems (to name just a few).

We do undertake best efforts to effect a full repair solution for your damaged devices and in most situations (95%+) the mainboard is in good condition and the repair is successful.   However in those (less than 5% of the time) situations where the mainboard has experienced damage that is exhibited by one of the behaviours described above (but not limited to) and we have tried installing a replacement part (example a screen) and the problem persists - the only possible culprit is the mainboard.  In these rare situations, our technicians will deem the mainboard to have failed (even if only partially) and the device to be unrepairable.  

In situations where we have replaced a part previously and some time later the device begins to exhibit mainboard symptoms - we will not be able to provide any warranty for the repair (although we may on a case by case basis determines that a refund is available for the installed part -- less our diagnostics fee -- providing it is still in a condition which is acceptable for return - in the expert opinion and sole discretion of our technicians).

The TechKnow Space will not be held liable in any way for the perceived value of the device nor will we provide any compensation for loss of use or time it takes to visit us one or more times in the cases where we deem a device to have a failed mainboard.

Portable Memory Logic Board Solutions

Standard memory sticks with USB Type-A plug are the most common type of portable memory. They come in different sizes and styles and have a very small and convenient package. Internally, the components are all connected to the small logic board, including the Memory chip, USB controller, jack and sometimes an LED indicator light. Read about our USB memory Data recovery if your important data is stuck inside and you need to get it out.

Memory chips, which are normally NAND type storage memory ICs, have a minimum typical life expectancy of 5 to 8 years. It has several I/O points which all connect to the motherboard in order to power the chip and transfer data. Unless the NAND chip is physically damaged there is a possibility to revive the device without replacing the NAND chip entirely. On some less expensive USB sticks, the NAND chip is encased in an epoxy, making it nearly impossible to replace. Memory corruption can also occur, causing the chip to behave strangely. Sometimes the information being read/written can be scrambled or the NAND will not activate as a result of memory corruption.

Inside look at a USB Memory stick showing the logic board and its components

USB controller IC talks to the device its plugged into, telling it what kind of device it is and how to handle it. USB controllers are the intermediary which all USB communication is transferred through. The standard universal serial bus, or USB, connection method is found in nearly all digital devices.

The jack is simply the standardized plug that plugs into your computer, TV, or other devices. We are seeing an increase of different plugs, such as lightning port plug for iPhones and Apple devices, microUSB for OTG devices and the new standard of USB Type-C. The most common and iconic looking plug is still the standard USB Type-A. This is the component that gets the most physically worn down, it is the only part that gets plugged and unplugged from devices. There are small, normally copper, pads which make electrical contact in order to transfer power and data to the device. Wrenching the device while its plugged in will cause the jack to be disconnected from and possibly damage the logic board. Also, the internal pads will eventually wear out with over use. In both these cases the jack would need to be re-attached or replaced with possibly some additional repair to the logic board traces.

LED indicator lights are not really a functional component. The sole purpose is just to let the user visually know that it is on and sometimes it blinks to tell you its reading or writing data. If the LED indicator light burns out it can be replaced, but not crucial. On the other hand, if the LED indicator light is not working and the device its plugged into doesn't recognize it, this could be an indication that something else is happening. No light? No power? Then there is obviously more to it than just the light.

Essentially, since all components are hardwired to the logic board all issues that cannot be resolved by re-formatting the memory is solved by addressing the physical problem on the logic board.

Game Console Logic Board Solutions

Possibly some of the more robust and advanced logic boards can be found in modern gaming consoles. There is a ton of high-tech proprietary engineered features packed into the current generation of gaming systems. Alot of power and high-level processing in order to give a modern feel with precise controller response and high definition video and refresh rate. You will definitely experience issues when one or more of these processes are interrupted. When problems happen an internal inspection is necessary to identify where the problem is originating.


Error codes are a great advantage in diagnosing a problem. When the Xbox 360 shows a red ring of death (RROD) or the PlayStation 3 has a yellow light of death (YLOD), there will be a problem booting the system. It is not an indication of what is going wrong, but that there is a general failure and as a failsafe it will not boot. When a console does not boot there will be no display on screen and thus no identifiable error code. This feature of a light pattern indicator informing the user that there is a general problem has been carried over to the current gen consoles with Xbox one's orange light of death (OLOD) and PlayStation 4's blue light of death (BLOD). Don't let the use of the word "death" scare you, it can be resurrected, it just needs to see a technician to address the internal issues. 

Phone Logic Board Solutions

The logic board on phones is typically referred to as the motherboard.


Comparing motherboard replacmement and motherboard repair:

We repair motherboards for the following phone brands:

Select your Brand for All Other Repairs

Phone Brand Logic Board Service Price Service Time
BlackBerry $CALL or
24-48 Hours
Google 24-48 Hours
HTC 24-48 Hours
Huawei 24-48 Hours
iPhone 24-48 Hours
iPod Touch 24-48 Hours
LG 24-48 Hours
Motorola 24-48 Hours
Nokia 24-48 Hours
OnePlus 24-48 Hours
Samsung 24-48 Hours
Sony 24-48 Hours

iPhone Logic Board Solutions

Different iPhone models exhibit similar symptoms as a result of failure of a logic board component.  

A summary of such iPhone problems requiring board level repair include:

  • Dark display
  • No backlight
  • Touchscreen not responding
  • Touch IC "Disease"
  • Won't charge even after port replacement
  • Damaged connectors

You have encountered a Logic Board problem when experiencing the following issues:

iPhone with backlight problems has had its mainboard repairedNo Backlight Repair

-Dim Backlight

-Brightness won't increase

black screen on an iPhone needing repairBlack Screen Repair

-No Image

-Turns on but No Display

an iPhone that does not chargeNot Charging Repair

-Charging Circuit Failure

-Charges Intermittently

iPhone that wont turn on needing its logic board repairedNo Power Repair

-Power Management Repair

-On board power circuit failure

iPhone with 'Touch Disease'Touch IC Repair (iPhone 6 Plus)

-Touch Disease Repair

-Grey Bar of Death

iPhone cameras not working main board level repairCameras Not Working Repair

-No Photo Preview

-Camera not activating

iPhone Blue screen of death repair mainboard serviceBlue Screen Repair

-Blue Screen Of Death

iPhone cameras not working main board level repairBroken Connectors Repair

-LCD / Touchscreen Connector

-Missing / Broken Pins

-Corroded Contacts

iPhone iTunes error code 4013 dialog4013 Error Code

iPhone Won't Restore Repair

iPhone data recovery from damaged mainboardiPhone Won't Turn On Data Recovery

-Data Recovery (Damaged Mainboard)


What is iPhone Touch IC Disease

iPhone Touch Disease or Touch IC disease as it is so-called is a failure of on the mainboard of the iPhone (affecting iPhone 6 Plus models especially) that causes a degradation and eventual failure of the iPhone's touchscreen response.  

Essentially you will find that over time as you attempt to interact with the iPhone's touchscreen it will become more and more difficult to activate the controls and eventually nothing will happen when you touch or swipe.

Some are calling this problem (which Apple has acknowledged exists) a defect. However, Apple's website indicates that the failure is a result of repeated drops, knocks and/or other stresses experienced by the iPhone. They are neither covering failure under warranty nor repairing the damage -- leaving affected users to their own devices to find a solution from a third party repair shop.

The cause of the problem consists of the failure of 2 integrated circuits on the iPhone mainboard - namely the U2402 & U2401 chips which require replacement in order to provide a solution.

iPhone touch disease showing grey bar

A distorted grey band may show intermittently at the top of the display.

This distinctive grey band is usually a tell-tale sign that your iPhone is suffering from the mainboard surface-mounted component failure known as Touch Disease, Touch IC Disease or Touch IC Failure.  





Data Recovery from iPhone With Damaged Mainboard

When your iPhone mainboard is damaged, you haven't synced your iPhone's data with iCloud, AND you consider that data to be vital business information or irreplaceable nostalgic photos and videos (for example) -- you may not yet be completely out of luck!

There is more than one approach to go about recovering data from a damaged iPhone. 

1. The iPhone doesn't work but powers on to the point where when interfaced with a computer and software data recovery is possible.

2. Repairing the mainboard damage sufficiently to allow access to the iPhones memory and using a host computer and data recovery software.

2. Removing the onboard storage integrated circuits and recovering data from the onboard flash storage using a specialized iPhone flash IC host. 

Bring your damaged iPhone in to us and we will determine the best (if any) method to recover your iPhone data. 

iPhone Wont Turn On Due To Mainboard Damage

An iPhone that doesn't turn on after damage to the mainboard as a result of an impact, liquid exposure, heat etc. is not necessarily bricked forever. 

Depending on the circumstances that led to the damage there may be a short circuit, an open circuit that should otherwise be closed, or a capictor or other surface mounted 'power-management' component may be damaged.

Extensive testing using microscopes and infrared heat sensors to specifically identify the damage, and subsequently repairing circuits or replacing components with micro-soldering and reballing tools is required.

The entire process of repairing an iPhone that has mainboard damage preventing it from powering on can take several days.

What Causes The iPhone Blue Screen of Death

The iPhone Blue Screen (Of Death) is a situation where during normal operation of the iPhone or when interacting with certain apps it suddenly goes to a all blue screen and may freeze - requiring a hard reboot. 

Typically, there are 3 common possible causes of the dreaded Blue Screen on an iPhone.

  • Damaged, or mis-seated Home Button Connector
  • Damaged proximity sensor ribbon flex cable
  • Damage to the mainboard itself - usually as a result of long screw damage.

Having determined (preferably by a competent repair technician) that the cause is not either of the 1st two mentioned, you will need an iPhone mainboard repair. 

iPhone iTunes Error 4013

The most common question asked by iPhone users finding themselves in this situation is "Can I get my iPhone working again AND save the data?"

When the cause of the 4013 Error (Cannot Restore iPhone) is mainboard failure there is no way to restore functionality while also saving the data on the iPhone.  

The NAND chip (integrated circuit or IC) requires reprogramming which will - while restoring functionality - will also restore your environment to factory defaults, with no data.  

iPhone Back-light Problem Caused By Mainboard Damage

There are several possible reasons (other than a failed or broken display assembly) for a dim backlight or no backlight at all:

  • Long Screw Damage

    • Sometimes an inexperienced home-technician or Do-It-Yourself enthusiast undertakes to replace their own iPhone Screen.  If they have not been very careful to put the same screws back into the same places a long screw may be tightened in where a shorter screw rightfully belonged.  This error may result in the longer screw having been driven down into the traces on the logic board causing a short-circuit or a broken circuit.

  • Diode Failure

    • Diode failure may happen as a result of the drop that broke the iPhone glass and (not obviously) also caused internal damage. It is not unusual for this failure to become evident until after a new screen has been installed.  This component replacement may accompany long screw damage.
  • Backlight Coil Failure

    • The least often culprit and usually a by-result of other damages -- still requiring surface mount logic board component replacement in such circumstances.

Macbook Logic Board Solutions

Macbook logic board repair toronto, and Macbook logic board repair mississauga.If we find that a logic board issue has a cost-effective repair solution, we can attempt to perform the approved repair. Generally, we need anywhere from 1 to 10 days to complete the repair, depending on the complexity.

For liquid-damaged devices, we do undertake cleaning of the logic board upon customer request. If the logic board can be reliably cleaned and we think the device can potentially be saved, we proceed to provide an estimate for repair. No warranties are offered for repairs on a liquid-damaged device. Please read our comments on the subject before bringing the device in.

We do not have access to new logic boards from the original manufacturers since we are not the authorized service centre for any vendors/brands/OEMs.

We do not carry any logic boards in our inventory, yet would be willing to source used/refurbished logic boards in the open marketplace (ie. eBay, Kijiji, etc on the internet) upon user request and after obtaining a deposit in advance. Sourcing logic boards can take from 2 to 4 weeks and can cost from $300 to $800 (including parts and labour). Also, we do not warranty these used/refurbished logic boards, since these are sourced from anonymous third-party sellers.

However, if you'd like to provide us with your own logic board, we would be happy to replace it, only charging you for our repair labour charge. Again, we cannot warranty the outcome of this, since we cannot warranty a part that we have not sourced ourselves.

Bottom Line: Unless the logic board can be repaired, we advise against replacing them. If replacing is necessary, we suggest that you contact the manufacturer of the computer/laptop.

Laptop Logic Board Solutions

Laptop Data Recovery

Laptops come in a variety of sizes with different interfaces and performance ability. Since the first portable computer, The Osborne 1, released in 1981, there has been an enormous amount of development, adding new features and accessibility to the world of mobile workstations.

Although laptops have come a long way from their first models (which weighed 23 pounds), the primary electronic components function exactly the same. All computers require a central processing unit (CPU), memory, graphics processing, power source, a display and a method to interface with it (ie. mouse and keyboard). Modern laptops typically have all these components mounted together into one convenient portable unit. Just like any other electronic equipment, if one of the major components don't function properly then the entire system will experience problems.

In order to pack all the state-of-the-art features into one unit, circuit boards have become increasingly more condensed. Utilizing smaller components, integrated circuits and multilayered circuit boards, which sandwich additional copper layers between layers of insulating material, all sorts of newer technology can be crammed into something we can carry in one hand. After more than 30 years, these portable computers still use a central circuit board which connects all the major components and interface devices. We call this circuit board a logic board (or less commonly known as main board or motherboard).

Laptop Logic Board Repair

When an internal problem arises, however, it is far less convenient to access the logic board than it is to carry around. Most issues with laptops require a teardown of the many tightly packed components, logic board repairs demand complete disassembly. 

Check our Data Recovery Solutions page for laptops when getting your laptop running again is secondary to recovering the lost data. If you're guilty of not backing up your important personal data and your old laptop is ready for the scrap heap, then it is abundantly clear that you need to restore your lost data before losing it forever. At the Techknow Space, our data specialist technicians can help bring back those unforgettable moments.

We have logic board solutions for all laptop makes and models, including the following brands:

  • Acer
  • Alienware
  • Apple
  • Asus
  • Compaq
  • Dell
  • Fujitsu
  • Gateway
  • IMB
  • HP
  • Lenovo
  • LG
  • MSI
  • Razer
  • Samsung
  • Sony
  • Toshiba
  • Other

Repair Inquiry Form
Toronto: 416 987 9860   Mississauga: 905 897 9860