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I wasn't suggesting the main cap itself was shorted, just that it served as a convenient point to test. Apologies for any confusion.
You'll most likely find the 8 pin IC is shorted. These ICs contain the power supply controller and an integrated switching FET. If you can find the datasheet (I can't read the type number in the picture) it will show which pins are which. As it is only an 8 pin DIP, easiest to just desolder it and check the board for the short. If the short is gone with the IC removed, the IC is to blame.
Before replacing the IC check the associated components - looks like there are a couple of small diodes on the top side of the board and a few smd resistors on the bottom - and replace as necessary.
If the short remains with the IC removed the other possibility is the bridge rectifier (circled in the picture).
If this player got hit with a surge it's possible both the rectifier and the IC will be bad.
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