When the circuit board is soldered, the pads fall off because the soldering time is too long or the temperature is too high due to repeated soldering. The copper sheet of the circuit board pad will expand repeatedly to fall off. Pay more attention to this when soldering to prevent more falling off.
On the circuit board, use a knife to cut off the peeled pads and cut them to the parts that do not fall off, so as to prevent the circuit from expanding along the dropped parts. If your component pins are long enough, you can scrape off the insulating paint on the cut-off circuit joints and apply solder Solder the pins of the vision here. If the component pins on your PCB are not long enough, you can use a piece of thin wire to pass the good solder along the pad hole and solder it to the component pin, and solder the other end to the pad The joints are fixed with hot melt adhesive to prevent re-opening welding and falling off
If the pads of your circuit board fall off very seriously, it is not suitable for the above method. You can also choose the way of flying wires to solder one end of the wire to the unsoldered component pin, and solder the other end to any pad connected to the unsoldered pad. There is another way on the solder joints, bridging, if there are components on the same line around the desoldered pad component pins; you can directly solder the component pins to the pins of that component, discarding the original pads, of course, When soldering, be sure to see clearly that you cannot solder the string to prevent the components from being burned
