Samsung Galaxy A70 Water Damage

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Samsung Galaxy A70 Water Damage

Version: SM-A7050 (China, Hong Kong)

Defect Phenomenon

This device got water damaged, then cause no display and cannot boot up.

Teardown the device, then clean and dry the motherboard, phone can boot and display normally.

But when we dial the ‘112’ , pop up a window to remind “is opening the Antenna Switch”

Dial *#06#, the SN number displays normally, so the motherboard should be OK.

The issue might be caused by the sub PCB board.

Repair Process

First, check the cosmetic of the Sub PCB board, there’s a chip get corrosive.

Samusng Galaxy A70 Water Damage

Then clean the chip, install the motherboard, issue still unresolved.

Samsung Galaxy A7050 Water Damage

Check the schematic, and as we can see this chip is SW9001 RF Switch

33 1

Remove the shielder with hot air gun, and after removing the chip, we can see there’s a pin get corrosive seriously. This pin connected with a capacitor, should be related with power supply.

 

Scratched out the corrosive pads, resolder with tin paste, then solder back the RF switch IC.

Assemble the phone to test, issue resolved.

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REWA Academy

As an enthusiastic educator and expert in mobile technology, REWA Academy has dedicated its career to empowering individuals through technical education. With a keen focus on cellphone repairs, they have developed comprehensive online and offline courses at REWA Academy. Their expertise spans a wide array of areas, including iPhone repair training, phone hardware, software, and advanced troubleshooting techniques. Through their writings, they aim to demystify mobile technology complexities, making it accessible and understandable for both novices and professionals in the field.

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