How can we repair iPhone 7 report error 4013
We received an iPhone 7, the customer said that he refreshed the iPhone 7, then the phone became iTunes mode and reported error 4013. Have you ever encountered this situation? How to fix it? In this mobile phone repair tutorial, you will find a way to solve it.
According to our experience, we know that mobile phones have signal problems. Generally, we should first detect the baseband. If there is a problem with the base, don't try to refresh it again, because there will be an error (error 4013, the progress bar will go to 60% or 80% position will report - 1).
It is found that there is a problem in the baseband. Since the iPhone is iTunes data cable mode, the voltage can not be measured. So we can only use Fluke digital multimer to check whether the resistance of each circuit of baseband power supply is normal. The test points of each circuit can be found more accurately based on the WUXINJI schematic diagram, and the corresponding components can be found on the bitmap for testing.
After testing, the resistance of baseband power PP_VSW_S4 is only 45, but the normal resistance value should be more than 500. As shown inpicture.
This circuit is connected to main power supply, base band power supply, small radio frequency and large radio frequency. The cell phone can be properly connected without taking into account the main power supply. First, the baseband power is taken down, the resistance is not correct, but i's normal after taking off the large RF resistance. As shown inpicture.
Replace the new baseband power and large RF IC, the reflash process passes smoothly. When purchasing the iPhone 7 chip replacement, repair technicians can prepare stocks for both two versions, Qualcomm is different from Intel chips.
Plug in card to test, all the functions are normal. The iPhone 7 error 4013 fault is caused by the damaged large RF itself, which leads to the short circuit of the baseband power circuit S4, resulting in the failure of the working conditions. It's common for the problems in the 7 and 7Plus baseband, if you encounter the same situation, you should first test the circuit.
Are you interested in mobile phone repair? Do you want to learn more about mobile phone repair? Please visit www.vipfixphone.com.
According to our experience, we know that mobile phones have signal problems. Generally, we should first detect the baseband. If there is a problem with the base, don't try to refresh it again, because there will be an error (error 4013, the progress bar will go to 60% or 80% position will report - 1).
It is found that there is a problem in the baseband. Since the iPhone is iTunes data cable mode, the voltage can not be measured. So we can only use Fluke digital multimer to check whether the resistance of each circuit of baseband power supply is normal. The test points of each circuit can be found more accurately based on the WUXINJI schematic diagram, and the corresponding components can be found on the bitmap for testing.
After testing, the resistance of baseband power PP_VSW_S4 is only 45, but the normal resistance value should be more than 500. As shown inpicture.
This circuit is connected to main power supply, base band power supply, small radio frequency and large radio frequency. The cell phone can be properly connected without taking into account the main power supply. First, the baseband power is taken down, the resistance is not correct, but i's normal after taking off the large RF resistance. As shown inpicture.
Replace the new baseband power and large RF IC, the reflash process passes smoothly. When purchasing the iPhone 7 chip replacement, repair technicians can prepare stocks for both two versions, Qualcomm is different from Intel chips.
Plug in card to test, all the functions are normal. The iPhone 7 error 4013 fault is caused by the damaged large RF itself, which leads to the short circuit of the baseband power circuit S4, resulting in the failure of the working conditions. It's common for the problems in the 7 and 7Plus baseband, if you encounter the same situation, you should first test the circuit.
Are you interested in mobile phone repair? Do you want to learn more about mobile phone repair? Please visit www.vipfixphone.com.
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