Skip to main content

Troubleshoot: iPhone 7 Plus doesn't boot(short-circuit)

The iPhone 7 Plus doesn't boot because of short-circuit, what's going on? How to fix this trouble? Here is the troubleshooting guide!


Trouble phenomenon

We press the iPhone power button as usual to turn it on, but the iPhone has no response, the iPhone screen always keeps black. First we through it's the problem of the iPhone screen, so we try to use another cell phone to call this iPhone, but we found this iPhone 7 Plus doesn't boot.

Troubleshoot

Use phone opening tools to disassemble the iPhone 7 Plus, after open the iPhone display assembly, measure the iPhone 7P with DC power supply,  there is no current, which means there is no leakage phenomenon. Trigger it, and it shows large current, the current ups to 1.9A.

Take out the iPhone motherboard, use rosin method, so we can find out the problem easily. We can check it under the microscope.

Is it the iPhone main power problem? Check iPhone bitmap via WUXINJI Dongle, and then we found that the iPhone Nand flash power supply is also in the hot location, now we need to test whether the iPhone Nand flash is short-circuited.

After testing, we confirmed it is short-circuited. Now we need use BGA remove tool to scrape out this set of power capacitors with glue around the iPhone Nand flash, and then apply rosin to it, set DC power supply to 3V to heat this circuit. This capacitor is short-circuited, remove it directly.


Measure the iPhone 7P with DC power supply again, now the current tested is normal.

Assemble the iPhone 7 Plus, press the iPhone power button, now the iPhone 7P can be turned on properly. After entering the IOS, test all functions on iPhone, all functions tested are normal.



Labels:

Comments

Post a Comment

Popular posts from this blog

Complete Guide to Replacing Your iPhone Battery at Home

  Has your iPhone battery started showing the dreaded signs of age, like frequent charging, rapid draining, or even an untimely shutdown? Are you considering a battery replacement but feeling deterred by the potential cost or hassle of a trip to the Apple Store? Don't worry; with the right guidance, you can replace your iPhone battery at home quickly and safely, sparing your wallet and ensuring a future of longer charge cycles for your beloved device. Whether you have the latest model or an older version, we'll walk you through the process step by step. But before we get into the nitty-gritty, here's why a battery replacement might be in your best interest. Why You Should Replace Your iPhone Battery The lithium-ion batteries in our smartphones are not immortal. They degrade over time due to a variety of factors, such as age, temperature, and the number of charge cycles. Replacing an old battery can provide several benefits: Improved Performance: A new battery can result ...
Post a Comment
Read more

User Manual: JC V1 Programmer to fix iPhone light sensor/vibrator

As we know, the light sensor and vibrator is very important for iPhone screen. If you want to replace the iPhone screen, you also need to transfer the original screen data to the new iPhone screen(iPhone 8 to iPhone Xs Max),so you can make sure the new iPhone screen will work fine. Here is a  JC V1 programmer  to fix iPhone light sensor and vibrator problem (for iPhone 7- iPhone Xs Max), it also can repair iPhone baseband eeprom IC or iPhone logic eeprom IC problem. The JC V1 Programmer comes with 24-inch HD display screen, three-color LED indicator light, two small connecting seats (for connecting function panel) , two buttons and one function panel (including light sensor/touch connector, baseband function connector, vibration connector) It support 2 languages (Chinese/English) and three lines of code (read/write/burn/save), the function panel can be changed, the software can automatically update What’s the functions? - Repair iPhone Light sensor/ true ...
1 comment
Read more

Here: JC P11 iPhone Nand Test Fixture Specification Details

JC P11 iPhone Nand test fixture is on sale now, some users still confused for it, what's credit points for JC P11? Why it's cheap? As we know, JC P11 BGA110 programmer is the latest programmer for iPhone   iPhone XS Max,XS, X, 8P, 8  and iPhone 11 Pro max/pro/11, which is made by JCID factory.  Here are some  specification details for JC P11 programmer . 1. Main Functions. - Support to modify and write BGA110 NAND SYSCFG data (NAND Flash underlying data, such as SN/BT/WIFI and others); Unbind WIFI. - It doesn't require restoring the firmware for brand-new Nand flash, the SYSCFG data can be written directly. - Repair the Error 35 during firmware restoring for BGA110 NAND - Repair the DATA Error for BGA110 NAND - Support iPhone 8/8P/X/XS/XS Max currently, free software upgrade to support 11-11Pro Max in the future - Initiate the network charging mode, can purchase the points according to the demand, which greatly saves the equipmen...
Post a Comment
Read more