Playstation 1

The first batch of PlayStations used a KSM-440AAM laser unit whose case and all movable parts were completely made out of plastic. Over time, friction caused the plastic tray to wear out—usually unevenly. The placement of the laser unit close to the power supply accelerated wear because of the additional heat, which made the plastic even more vulnerable to friction. Eventually, the tray would become so worn that the laser no longer pointed directly at the CD and games would no longer load. Sony eventually fixed the problem by making the tray out of die-cast metal and placing the laser unit farther away from the power supply on later models of the PlayStation.

Some units, particularly the early 100x models, would be unable to play FMV or music correctly, resulting in skipping or freezing. In more extreme cases the PlayStation would only work correctly when used upside down.

Disc read error (ps2)

An unknown number of early PS2 models suffered from problems reading DVD (silver bottom) discs, subsequently, a class action lawsuit was filed against Sony. Sony agreed to provide free repair or replacement for the faulty consoles and continued to do so until February 2005.

and of coz, some users here in LYN have experienced the lens failure in their PS3 unit.