Steve, if your solder iron has enough power (at least 50 W but better a bit more) you may do this:
- Desolder L502.
- Apply ChipQuick low temp solder to the two pins of Q507.
- Take a bit of flux on the metal of Q507 opposite to the two pins.
- Take a blob of normal solder with your iron on this metal of Q507 and wait 5 or 8 (or 12) seconds or so until you could take Q507 away. Because of ChipQuick the heat coming through Q507 to the pins is enough to melt this solder.
- Remove all ChipQuick from the solder pads for the pins.
- Don't remove the solder from the pad for the body of Q507.
- Apply a bit flux on the solder pad for the body of Q507.
- Hold the new Q507 in place using tweezers and heat Q507 like in No. 3 and 4 until you feel Q507 is swimming on the solder.
- Remove the solder iron and hold Q507 in place until it's fixed.
- Solder the two pins.
- Solder L502.
73 Ludwig
