Soldering Lugs to Repair iPhone 12 Pro Max Overheating

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After the iPhone 12 Pro Max dropped and the screen is cracked. We boot-up and find temperature warning appeared.




Remove the motherboard for testing whether it is deformed. The result turns on normally. Then we need to separate the motherboard for the pseudo-soldering.

1. Troubleshoot

Put the motherboard on the Air fun for heating and pry up the logic board with a Pry Blade while heating. If remove the logic board when it is becomes loose. Then remove the signal board.



We find pads on the logic board are missing when we put it under the trinocular microscope.



2. Repair the Bonding Pads



Clean the bonding pads with Soldering Iron and clean the bonding pads with PCB Cleaner.Use a Sculpture Knife to Scrape the missing pads and pay attention not to damage the GND while scraping.


Put the Soldering Lugs in position and apply some Paste Flux. Apply Solder Mask to the bonding pads and solidify with a UV Lamp and remove excess solder mask with a Sculpture Knife.

Clean the bonding pads and reball the signal board. Attach the signal board to the holder. Put the reballing stencil in position. Apply some low-temperature Solder Paste evenly. Remove excess solder paste.



Reball stencil and put the motherboard on the Heating Platform. Remove the motherboard after it has cooled for 5 minutes.

3. Test

Assemble and test the iPhone 12 Pro Max, and temperature warning disappeared.

If you notice your iPhone 12 Pro Max getting hot when charging, follow these steps to cool it down:

1. Unplug the charger.
2. If you’re using a case with your iPhone, remove it.
3. Turn off your iPhone and allow the heat to dissipate.




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