My ps2 won't read dvd backups even though it has the magic 3 installed

[legion1234]

First of all i hope you can understandme since my english is pretty
bad.

Some dumbass installed the magic 3 chip in my ps2 and then he tested a dvd rip game and it worked fine but then he tried to test a dvd backup(gta:vicecity,wildarms 3) and they didn't work then he told me that the laser of my ps2 need to be recalibrated so it can read the dvd backups and told me to comeback the next day.

Well I go to his shop the next day and he told me that he couldn't make the dvd backups work and gave me back my ps2 telling me that the chip he installed wasn't the problem that the laser of my
ps2 was the one that doesn't work and refused to give me back my money.

But thats not the worst of it when I comeback home I tried to test my dvd rips(dinasty warriors 3)and others backups I have they won't work,every time I tried to load them the red screen showed then later I tried again and still nothing until I put the ps2 in standby mode with the backup inside and turn it on again and finally the game boot without problems I tried the other backups and they worked too but when I turn it off for a while and turn it on again it give me the same problems.

I think this dumbass messed with the pots of the laser and that's why my ps2 it's having a hard time reading the dvd rips that worked fine with other chip I have installed(the one you have to use a gameshark to boot the dvd rips).

Can you help me fix this thing? I really wan't to play dvd backups on my ps2,my ps2 serial is 30001 I think is version 4 right?