Modbo 4.0 in -> Won't read discs

I installed a modbo 4.0 for my friend as a present, mainly for booting ps1 games.

But it didn't go as planned, the ps2 won't read any discs from DVD movies to original PS1 discs. It focuses the laser a few times, but doesn't seem to get any info out of the disc. PS1 games spin up, then a small snap is heard and the disc actually goes backwards for a second, then it retries. :crazy:

But at start up the matrix logo is seen, and I can change setting in the config menu..

Well then I took it out after going examining the board once more, and it works perfect.

Any ideas?

Picture, it's a pal v7

Problem solved, I took another chip off the shelf and everything works good.