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Just a question...is the supply an original canon unit or is the adaptor just a knockoff (its mitsumi...I think this is an OEM or at least they make good PSUs)?
Do you have a multimeter to confirm the PSU output is ok. You can use a fine piece of wire in the low voltage inner plug hole for a meter probe (don't short it out)
Most cases like on the PSU or adaptor can be cut apart with a sharp knife and plastic welded back with acetone (depends upon the plastic type).
Also many of these small cases have a fine slot/lip that is part of the gluing the case together process. I use a small bladed screwdriver in this slot and tap the back of the screwdriver handle (with some force) to break the original case glue seal. You need to work your way around the case small steps at a time tapping and breaking the seal and moving on.
Sometimes you make a bit of a mess but I have managed to open many computer swith-mode PSUs like this and successfully repair them and glue them back together. Usually it's the lead.
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