Hi all,
I have a battery charger which is blowing the fuse immediately when plugging the power plug (switch on).
Following the replacement of the fuse, I found that there is continuity between live and neutral. Started desoldering components close to the mains supply to check for continuity (varistor, caps, etc), but none of these were shorted.
Then the bridge rectified was desoldered and found that pins 1 and 2, 3 and 4 have continuity from both ends (polarities).
The pads marked in red below were also found to have continuity (pads of the + and - of the rectified).
Assuming that I am not missing anyting and that the conclusions above are correct, what can be the likely possible cause for these two pads to be shorted? I cannot find any components with visible damage/burns. I was going to start desoldering the TO-220 components, but this will be a headache. Anyone with some experience who can suggest the likelyhood of the fault?
I have a battery charger which is blowing the fuse immediately when plugging the power plug (switch on).
Following the replacement of the fuse, I found that there is continuity between live and neutral. Started desoldering components close to the mains supply to check for continuity (varistor, caps, etc), but none of these were shorted.
Then the bridge rectified was desoldered and found that pins 1 and 2, 3 and 4 have continuity from both ends (polarities).
The pads marked in red below were also found to have continuity (pads of the + and - of the rectified).
Assuming that I am not missing anyting and that the conclusions above are correct, what can be the likely possible cause for these two pads to be shorted? I cannot find any components with visible damage/burns. I was going to start desoldering the TO-220 components, but this will be a headache. Anyone with some experience who can suggest the likelyhood of the fault?