if youve tried to start it and it doesnt start the only way is to look closely on the board and see if there is any obvious corrosion. (from the pictures it looks okay.) but im not looking through a scope ya know?[br]
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anyway to try and salvage it youd need to do some serious troubleshooting more than likely to try and narrow down whats going on.
https://github.com/led02/psx_fpga/blob/master/psx_docs/Sony%20PSONE%20SCPH-101%20Schematic%20Diagram.pdf[br]
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thats a decent schematic for it! best bet would be trying to send it off to like northridge fix (on youtube) and they might be abl to fix it.
good luck!