Have you tried the diagnosis mode of the Ps2? Maybe it's simply a problem in the alignment of the lens; the Ps2 has an auto-diagnosis feature that adjust the setting of the DVD player.
Click Triangle in the main menu of the Ps2 browser (the screen you have when there are no games into the disc tray). Select Console, then click Triangle again. Set Diagnosis On then try playing your DVDs.
Let me know.
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