How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser

Rick Aug 25, 2021

Today we will share how to repair an iPad Pro that won't turn on .

The iPad Pro cannot be turned on due to water damage. Press the power button. IPad Pro does not power on. Connect the iPad pro to the power supply and the iPad Pro still won't turn on.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Next, we need to disassemble the iPad Pro for testing. Put the iPad Pro on the Heating Pad to heat.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


When the temperature reaches about 70 °C, separate the screen with a Pry Piece . Please pay attention to the angle and direction to avoid damaging the flex cables.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Then we remove screws on the shielding cover with a Screwdriver. Detach the shielding cover. Disconnect the flex cables.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Continue to remove screws on the shielding cover of motherboard and then the shielding cover.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Insert a Pry Piece between the battery and motherboard. Disconnect the battery.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Then we check if the boot current of the motherboard is normal. Power up the motherboard with a Direct Current Supply . When the probes touch the main power supply circuit of the motherboard and the boot-up hasn't been triggered, the current directly jumps to 2.7 A.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


We can confirm that the main power supply circuit of the motherboard is short-circuited, leading to the not turning on issue. Then we measure the diode values of the main power supply circuit with diode mode of the multimeter. The diode value is 534, which is normal.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


When measuring a nearby capacitor, the diode value is 0. It indicates that the circuit is shorted.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Since there are too many related components on the circuit, we use rosin detecting to find the short-circuited component. The Rosin Dispenser is used to dispense rosin this time. Compared to the traditional soldering iron, the operation is easier with better effect.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Then we apply a voltage of 3 V to the motherboard. It can be seen under the microscope that rosin on a capacitor has melted. We can judge that the capacitor is damaged.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


The next thing we need to do is to remove the capacitor. Remove the capacitor with Hot Air Gun at 340 °C and airflow 3. Please protect the surrounding battery while heating to avoid damage.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


After the motherboard has cooled, measure with multimeter again. The diode value returns to a normal value of 156.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Power up the motherboard again to trigger the boot-up. The boot current jump is normal.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Because the main power supply circuit of the motherboard is short-circuited, the battery is protected. Then we use the Direct Current Supply to activate the battery

Firstly, clean the motherboard with PCB Cleaner. Remove the Pry Piece. Apply a voltage of 4.2 V to the main power supply circuit to activate the battery.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser

How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Next, we assemble the iPad Pro for testing. Install the screws and shielding cover. Before installing the screen, we need to remove the double-sided tape on the screen and rear cover housing.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser

How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Then we apply new double-sided tape. Install the display.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


Turn on the iPad Pro. The iPad Pro turns on normally and the fault has been cleared. The screen of the iPad Pro shows a sign of water damage. Because the customer is unwilling to replace the screen, our repair can go so far.


How to Fix an iPad Pro that Won't Turn On - Short Circuit Detected by Rosin Dispenser


The above is the repair method for iPad Pro won't turn on. If you are interested in iPhone motherboard repair, REWA Academy has designed a ten days' live course for beginner. The course includes troubleshooting methods and demo repair for common motherboard problems. In the meantime, we offer continuous technical support for your learning. Join REWA Academy live course on 6 Sept to enrich your repair knowledge.

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