Find on this page the installation diagram for Playstation 2 SCPH770xx aka V15 for Modbo 4 to 5.
+ Some pictures of installation have done on this model using alternative point on some model for challenge.
Motherboard rev number can correspond for installation.

PAL

SCPH-77002 (GH-051-02)

NTSC-J (Japan)

SCPH-77000 (GH-052-12)

NTSC-U/C (USA)

SCPH-77001 CB (GH-051-02, GH-051-51)