iPhone 6s Plus Motherboard
iusedphone provides customers with a long-term supply of Grade A iphone motherboards and gives us relevant advice. There are two reasons why the iPhone 6splus motherboard is broken: one is that the phone in the water burns out the screen cable and the motherboard chip can not boot. The other is...
iusedphone provides customers with a long-term supply of Grade A iphone motherboards and gives us relevant advice.
There are two reasons why the iPhone 6splus motherboard is broken: one is that the phone in the water burns out the screen cable and the motherboard chip can not boot. The other is that the mobile phone is not turned on after the light drop or heavy fall causes the motherboard chip and the motherboard to be separated.
These two situations can actually be repaired, but many ordinary repair shops will tell the customer that the motherboard is broken because the technology is not in place. Request to change the motherboard. But in fact, there are many chips on the motherboard, which are responsible for power, display, voice, wifi network, 4G network and voice call. Each function has one or two chips to be responsible for. Therefore, for which fault, as long as the relevant management chip is found, it can be repaired. This can greatly reduce costs.
How to detect which chip on the specific motherboard is faulty? This problem needs to be handed over to the professional motherboard chip level technical maintenance personnel. The method is as follows:
1, the boot line is not normal: use the external power supply to power the phone, use the meter to check whether there is a change in the display, if there is no change, it is likely that the boot line is broken or the power button is not well connected.
2, the battery power supply circuit is not normal: use the external interface to power the phone, look at the boot back to normal, if it is normal, it is determined that the phone's power supply circuit is not normal.
3. The IC of the mobile phone power supply is not normal: Test the schematic diagram of the power supply IC on the test point of the peripheral circuit of the power IC to see if the test value is normal.
4. The system clock and reset of the mobile phone are not normal: You can use the dual total oscilloscope to detect the CPU power of the mobile phone and check whether the waveform graph in the reset is correct.
5, the logic circuit has a problem: that is, the fault of the mobile phone circuit version, generally can be solved by repair welding.
6, software conflict: the installed software does not match the system of the mobile phone may also cause the phone to boot, you can connect the phone to the computer to delete the program.
To sum up: the water and the fall of the mobile phone are mostly caused by the power management chip and cpu short-circuit soldering. In addition to cpu burned other problems can still be repaired. During the maintenance phase, it is best to remind engineers to detect problems such as the network, calls, and cameras. These problems may also cause a short circuit and cause a fault after falling or entering the water.