It is a model SCPH-5500. It reads audio CDs just fine, and also reads the audio portion of games that use redbook audio. Where it is failing is reading actual games, I have tried 2 games that work on my other unit and tried a different laser that I know works. It seems to fail when changing drive speeds, never going to 2x and never loading the black screen. Any tips?
Edit: I tested the laser in my other JP PlayStation, it works, so the problem MUST be on the motherboard, I have seen this problem on an SCPH-1001 before but never could figure it out.