The best solutions to fix iPhone 6 Plus Boot Without Display
Received an iPhone 6P, the current jumps normal and system also can be restored, the only problem is no diplay when booting, After measuring the grounding resistance of display connector and display condition are all normal ,we reinstall the iPhone CPU , the fault is still existing. Check the iPhone circuit diagram to measure the MIPI module conditions (required power supply, pull-up resistor, pull-down resistor, etc.). As shown in picture 9-12-1. it could be happening because of a variety of different reasons. The only way to know why it’s happening for sure is to troubleshoot.
In this piece, we’ll attempt to discuss the various reasons why this could be occurring to your iphone device(s), and some potential workarounds to get you back into the device.
When measuring PP1V0, there is no voltage, the resistance value to ground is 0, we doubt CPU is not installed properly, but it's the same fault after reinstalling. Remove CPU to measure motherboard without short circuit, CPU ground value is also not short circuit. Reinstall again, it's still short circuit. Removed and meausre the CPU on the ground value, three points are found short circuit on it, we finally find it's CPU problem. As shown in picture 9-12-2.
Study on the circuit diagram to know this is just a MIPIC short circuit, it's just one module short circuit, can we pass it? (the 5 test points is the same way in the circuit diagram, which should be interconnected, but for this iPhone fault, the above 3 points is VDD10_MIPIC, the following 2 points are VDD10_MIPID, which belong to two different modules, VDD10_MIPIC short circuit module did not affect the VDD10_MIPID) as shown in picture 9-12-3.
Cover these three pins with green oil, as shown in picture 9-12-4.
Installed and value the value, we find it is not short circuit now, after the trigger, it smoothly light the iPhone screen, functions are tested all OK, as shown in figure 9-12-5. (this is a question: MIPI bus connects with front&rear camera and screen, why both iPhone front&rear camera are available now? ).
In the end, UMT and CPU are not as scared as everyone says, and it's okay assemble and disassemble CPU on the iPhone motherboard for even four or five times.
In this piece, we’ll attempt to discuss the various reasons why this could be occurring to your iphone device(s), and some potential workarounds to get you back into the device.
When measuring PP1V0, there is no voltage, the resistance value to ground is 0, we doubt CPU is not installed properly, but it's the same fault after reinstalling. Remove CPU to measure motherboard without short circuit, CPU ground value is also not short circuit. Reinstall again, it's still short circuit. Removed and meausre the CPU on the ground value, three points are found short circuit on it, we finally find it's CPU problem. As shown in picture 9-12-2.
Study on the circuit diagram to know this is just a MIPIC short circuit, it's just one module short circuit, can we pass it? (the 5 test points is the same way in the circuit diagram, which should be interconnected, but for this iPhone fault, the above 3 points is VDD10_MIPIC, the following 2 points are VDD10_MIPID, which belong to two different modules, VDD10_MIPIC short circuit module did not affect the VDD10_MIPID) as shown in picture 9-12-3.
Cover these three pins with green oil, as shown in picture 9-12-4.
Installed and value the value, we find it is not short circuit now, after the trigger, it smoothly light the iPhone screen, functions are tested all OK, as shown in figure 9-12-5. (this is a question: MIPI bus connects with front&rear camera and screen, why both iPhone front&rear camera are available now? ).
In the end, UMT and CPU are not as scared as everyone says, and it's okay assemble and disassemble CPU on the iPhone motherboard for even four or five times.
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