iPhone 6 current shows 480mA and cannot turn on, how to fix it?

No matter when time, you should keep you iPhone far away from water, because it will damage your iPhone. Here is a case. The iPhone 6 dropped into water, and then it won't turn on. After connect to DC power, it's current shows 480mA.Now, we need to know how to repair it.

Before you repair it, you need to prepared all the phone repair tools you needed. All of this you can find it in vipprogrammer.

 The following are the repair steps:

1. Measure PP_VCC_MAIN with multimeter, we found that it is short circuit to ground. We can feel that power supply chip is hot when energizing it. Put a layer of white rosin at the circuits of PP_VCC_MAIN voltage. The short circuit place is where the rosin will first melt. After a while, we can see that the rosin on a capacitor near power supply chip melts first, as shown in picture 6-1. Remove the capacitor, the PP_VCC_MAIN is not short circuit.

However, after we connect to power supply, the iPhone 6 still cannot be turned on. The current stops at 0.156A (156mA), as shown in picture 6-2.

2. We continue to measure and find that the voltage of RESET_1V8_L is 1.1V. Its location in bitmap is shown in picture 6-3. 

3. Then we measure the AP_BI_I2C0_SDA and found it's voltage is 0V.This point is normal. The test point of signal AP_BI_I2C0_SDA in bitmap is shown in picture 6-4. 

4. Measure the circuit between AP_BI_I2C0_SDA to PP1V8 and it is not open circuit. Its resistance is 2.2kΩ. The location of pull-up resistor in circuitdiagram is shown in picture 6-5.

5. After checking the circuit topography, we know that AP_BI_I2C0_SDA bus runs to U0201, U1202, U1700, U1501 and U1502. Based on experience, in watered iPhones, the chips without painted glue are very likely to be broken. Among these chips, only U1501 and U1202 is not painted glue. The location of U1501 in bitmap is shown picture 6-6.

6. Remove the U1501, the turn on current jumps normally. And the voltages of RESER_1V8_L and AP_BI_I2C0_SDA turn normal. Replace U1501 and iPhone can be turned on normally, but is displays nothing.

7. Now, we handle the no display problem. After measuring, the backlight voltage boost is 0V and D1501 has been damaged. The location of D1501 in bitmap is shown in picture 6-7.

8. Replace D1501 and measure the backlight voltage boost is 4V. After analyzing the circuit topography, the damage of U1502 will cause that voltage cannot be boosted. The circuit topography of backlight voltage boost of U1502 is shown in picture 6-8.

  

Finally, after replace the D1501, everything goes fine, the iPhone 6 can be turn on and the it can be displayed normally, all the function back to normal. The iPhone was back to health.