iPhone motherboards are some of the most technologically advanced pieces of equipment that modern consumers have access to. They pack a maze of intersecting voltage lines, controlling a multitude of different functions, into a tiny area inside your iPhone. Everything that your iPhone can do is controlled by the motherboard; it acts as the brain.  Once the iPhone X was released it became clear that iPhone X Motherboard Repair and higher would become quite common. It is a stacked board that can be prone to voltage line disconnects. UNABLE TO ACTIVATE and NO SOUND DURING CALLS are both examples of iPhone XS Max Motherboard voltage line disconnects. 

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There are a few ways that iPhone motherboards will typically fail:

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Flexion

Over time, flexion of the iPhone can break the voltage line traces causing disconnects. When this happens, a jumper wire is used to manually reconnect the broken line. The problem is gradual and usually happens without you noticing. 

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High Impact

A cracked screen is not the only possible outcome from a dropped phone. If your phone suffers a severe drop or is crushed it is likely that the motherboard will also be damaged. Capacitors become shorted, coils become loose, and chips become smashed. 

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Spontaneous Failure / Voltage Spike

Sometimes it is unclear why the logic board failed. Often, a capacitor will be found shorted on power lines for seemingly no reason.

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Water Damage

Water will wreak havoc to a motherboard. In most cases, a motherboard that has been damaged by water will show problems for the rest of its lifetime, even if repaired. For this reason the best solution is to perform IPHONE DATA RECOVERY if you do not have a backup and purchase a new phone.

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Technician Damage

It is also common for iPhone Repair Shops to damage the motherboard during routine screen replacements. If the battery is not unplugged or a small component is accidentally knocked off then it is likely that image or touch will fail, or the phone may not turn on at all.