misterbleepy wrote:While I track down replacement caps, and try an source the relevant fuse, does anyone have any tips on replacing the existing capacitors (or rather their remains) without removing the circuit board from the casing?
I was thinking I could carefully remove the remnants of the caps while leaving their wire "legs" behind, and then solder the new caps legs to those - does that sound feasible?
If you cut the legs and solder the new caps to the old legs in mid air on the top there is a significant risk of creating a dry joint since you would most likely end up reheating and reflowing the solder on the old leg (on the underside of the board if there are no plated through holes) and any movement of the unsupported leg would cause a dry joint to form that you then can't get at...
I can't really tell from the photo but the board is double sided I presume ? Looks like there is only ground plane around the caps on the top side and traces to the caps only on the bottom side ?
Does anyone know if the board has plated through holes for the capacitors ? If it does, what you might get away with doing is to remove the old capacitors (heating the leg just above the pcb should melt the solder underneath and let you pull it out cleanly, then clear the hole with a solder sucker and a dental probe or similar) and use a very fine tip iron to carefully solder the legs of the new capacitor directly to the top side ring of the plated through hole with the leg inserted slightly into the hole. As long as the through holes are of good quality this should work and if you apply the right amount of solder (not too much) some will flow down the hole as well.
If you try this I would do a continuity check from the cap leads to whatever nearby components it's supposed to go to just to verify that you do have a connection as running the charger with them not properly connected could potentially cause damage so you'd want to be sure they were definitely connected. Hopefully someone can advise what other components each capacity leg goes to so a continuity test can be done to each leg.