Aug 17, 2018
Are you ever trapped into the situation that iTunes Error 4013 on iPhone 7/7 Plus? Actually, it is one of the most common problems for iPhone users. Also, we have sort out and released all the iTunes error codes of iPhone 6/ 6 Plus, as well as all the meaning of iPhone error codes. iTunes Error 4013 of iPhone 7/7 Plus is usually caused by pseudo soldering or damage of CPU. The problem might also be related to power supply of baseband PMU or NAND flash. Since CPU repair is quite difficult, to start with we can check the power supply of baseband PMU and NAND flash. Let’s check the details.
First, press power button to power on, the phone gets stuck with iTunes Recovery Mode and has no access to the system. Next, connect it with computer and restore via iTunes, error 4013 appears during the restoring process. The phone restarts afterward.
iTunes Error 4013 of iPhone 7/7 Plus is usually caused by pseudo soldering or damage of CPU. The problem might also be related to power supply of baseband PMU or NAND flash. Since CPU repair is quite difficult, to start with we can check power supply of baseband PMU and NAND flash. Connect battery connector with Power Supplier, and press power button on the Power Supplier. The system will then detect power button press. The run voltage measurement of baseband PMU test points C5623 and C5631, the measured value of C5623 and C5631 are normal. Judging by this, power supply of baseband PMU is normal.
Let’s move to the power supply of NAND Flash, let’s remove black adhesive around NAND Flash with Hot Air Gun.
Then continue to measure voltage of NAND Flash test points C1701, C1721 and C1704. Judging by the measured value, power supply of NAND Flash is also normal.
Let’s try to replace the baseband PMU and see how it works. Detach baseband PMU from the board with Hot Air Gun, then clean the bonding pad with resin-soaked Solder Wick.
Tips: some chips are sealed to the bonding pad with black adhesive, be careful with your operation to avoid knocking pads off the board.
Clean with PCB Cleaner afterward.
Apply some Paste Flux to the bonding pad, get a new baseband PMU in position(be careful with the direction). then solder with Hot Air Gun.
Once done, wait for the logic board to cool for 5 minutes and clean thoroughly with PCB Cleaner afterward.
Assemble and Test
Till now, the whole repair process is fully finished, let’s get the logic board and display assembly installed. Connect the battery and press power button to power on, the phone gets stuck with iTunes Recovery Mode. We need to connect it with computer and restore via iTunes. The phone can be restored normally.
Once completed, the phone restarts automatically, fault cleared. (Warm tips: get the phone full assembled after confirmation of fault clearance.)
iPhone 7 Plus Error 4013 fixed perfectly. For more details about fix iPhone 7 Plus Error 4013 please check our video. Any suggestions or questions please comment below or go to ASK Forum to post an ask, we will try our best to help you and answer you in time.
Tools List Used:
* Electron Microscope
* Digital Multimeter
* PCB holder
* Straight Tweezer
* Solder Wick
* Cutting Nipper
* Anti-static Plastic Pry Bar
* Soft Brush
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