Introduction: How to Repair a Badly Soldered Connection
Optional- screw driver
Plug in your iron then pry open the device.
Go to the bottom side of the PCB
Locate the bad connection(s)
Put some solder into the iron.
Heat the bad connection and put new solder on it. Make sure you don't cross any other components.
Put it back together carefully.
See if it works.
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Please be positive and constructive.