Simple repairs include replacing peripherals such as display, battery, cameras, ribbon cables ... etc. These peripherals can be replaced in 0.5 to 1 hour, relatively easily. The worse and more complicated case is if replacing the peripheral does not solve the problem. In this case, the motherboard should continue to search for the cause of the error. A motherboard is much more complex, much more complex than the device itself. Alternatively, parts mounted on the system board may only be moved under a microscope. A motherboard failure can be very complex, as each component is almost related to each one, so there are many variations that can be ruined. Mapping these error opportunities requires several hours and much more expertise. Faults on board components such as ICs, resistors, capacitors are not always obvious, which is not a matter of minutes. Tests after system board repairs (such as diving, charging) are also time consuming, and we dare to say that the device is okay. All in all, a careful motherboard repair can take several days.