Just a quick note. Today I successfully fixed dead controller ports on one old Sony PlayStation model 5502 using this awesome guide:
http://www.gamesx.com/controldata/psxcont/psxfuse.html
Basically, as usually for this kinds of malfunctions the culprint is a blown fuse near the controller board.
To fix it either replace the 700mA SMD fuse or wire a glass one to the sides of the old one. It's an easy operation and can revive your old PS1 in a matter of minutes.
Thanks to Andrew J McCubbin for finding the cause and explaining his findings.
http://www.gamesx.com/controldata/psxcont/psxfuse.html
Basically, as usually for this kinds of malfunctions the culprint is a blown fuse near the controller board.
To fix it either replace the 700mA SMD fuse or wire a glass one to the sides of the old one. It's an easy operation and can revive your old PS1 in a matter of minutes.
Thanks to Andrew J McCubbin for finding the cause and explaining his findings.