Originally Posted by
Niku-Sama
its a PU-18 or PU-20 main board used in SCPH-700x, SCPH-500x/550x/555x
the best way to determine is...
PU-18 its going to have chips on the bottom
PU-20 is going to be smooth on the bottom, no chips
both revisions have similar shielding on top, copper flappy bit and the soldered tin part.
PU-18 would be SCPH-500x/550x/555x
PU-20 would be SCPH-700x
replace the "x" with 0 for Japan, 1 for US, 2 for Europe although laser assemblies should be the same in the regions
SCPH-750x went to something different, no copper flappy bit
the part I find odd is they should swap laser assemblies so I am thinking that something else is wrong. from personal experience I've traded laser assemblies across different revisions (SCPH-1001 to 7501 and in between) and its worked fine