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hello, how to replace buzzer in 3gs? can i must use the soldering iron? any instruction please

iPhone 3GS Vibrator Replacement There’s the guide from here :) no soldering needed, just need to take the screen assembly off, un-screw the logic board / disconnect cables from it and remove that, then it’s just a couple of screws to remove the current vibrator. If it doesn’t seem damaged, you can try and bend the pins up towards the logic board again, it may have just come out of contact with the bottom of the board. Hope it helps.