Psx or ps1 board

I bought a chip for a new.ps1 that I bought for my kids.i had a friend who works on TV's solder it in and it didn't work. We took it out and now the PS1 doesn't work.I then bought a used PSX(the bigger one).Is the board on the psx any easier to work on than the ps1?i don't want to trash that one too. Thanks.