PSX - Removing Mod Chip

Yesterday I've found my PSX on my grandmother house. And He is still working.
But, it not reading CDs. [Maybe that is the why I leaved there]
I've try to search a bit, but Google told me that if i remove the mod Chip the desk reader going to work again.
But, when I remove all those chips from PSX it stop work. [Freeze at stat screen]
And when I solder it back, it works again.

Does any one know how to remove this mod chip? [Or do i have to buy a new Disk drive?]

I'm thinking to buy an...

PSX - Removing Mod Chip