Real solution for iPhone 6 Plus no display after booting

Today, we are going to share a real solution for iPhone 6 Plus no display after booting. it just shows black screen, but it can get the phone calls.

After a preliminary examination, the current jumps normally, the IOS can be brushed, the only problem is no display after turn on. Measure the diode data of display connector and display condition, they all normal, so we assemble the iPhone CPU. Check the circuit diagram to measure the MIPI module conditions (required power supply, pull-up resistor, pull-down resistor, etc.).

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 iPhone CPU on the ground value, three points are found short circuit on it, we finally find it's CPU problem.

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 UV oil, as shown in picture 1.

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.

By the way, UMT and CPU are not as scared as everyone says, you can fix it!